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mm/vmalloc.c
65.7 KB
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/* * linux/mm/vmalloc.c * * Copyright (C) 1993 Linus Torvalds * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 * SMP-safe vmalloc/vfree/ioremap, Tigran Aivazian <tigran@veritas.com>, May 2000 * Major rework to support vmap/vunmap, Christoph Hellwig, SGI, August 2002 |
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* Numa awareness, Christoph Lameter, SGI, June 2005 |
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*/ |
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#include <linux/vmalloc.h> |
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#include <linux/mm.h> #include <linux/module.h> #include <linux/highmem.h> |
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#include <linux/sched.h> |
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#include <linux/slab.h> #include <linux/spinlock.h> #include <linux/interrupt.h> |
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#include <linux/proc_fs.h> |
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#include <linux/seq_file.h> |
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#include <linux/debugobjects.h> |
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#include <linux/kallsyms.h> |
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#include <linux/list.h> #include <linux/rbtree.h> #include <linux/radix-tree.h> #include <linux/rcupdate.h> |
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#include <linux/pfn.h> |
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#include <linux/kmemleak.h> |
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#include <linux/atomic.h> |
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#include <asm/uaccess.h> #include <asm/tlbflush.h> |
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#include <asm/shmparam.h> |
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|
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/*** Page table manipulation functions ***/ |
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static void vunmap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end) { pte_t *pte; pte = pte_offset_kernel(pmd, addr); do { pte_t ptent = ptep_get_and_clear(&init_mm, addr, pte); WARN_ON(!pte_none(ptent) && !pte_present(ptent)); } while (pte++, addr += PAGE_SIZE, addr != end); } |
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static void vunmap_pmd_range(pud_t *pud, unsigned long addr, unsigned long end) |
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{ pmd_t *pmd; unsigned long next; pmd = pmd_offset(pud, addr); do { next = pmd_addr_end(addr, end); if (pmd_none_or_clear_bad(pmd)) continue; vunmap_pte_range(pmd, addr, next); } while (pmd++, addr = next, addr != end); } |
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static void vunmap_pud_range(pgd_t *pgd, unsigned long addr, unsigned long end) |
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{ pud_t *pud; unsigned long next; pud = pud_offset(pgd, addr); do { next = pud_addr_end(addr, end); if (pud_none_or_clear_bad(pud)) continue; vunmap_pmd_range(pud, addr, next); } while (pud++, addr = next, addr != end); } |
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static void vunmap_page_range(unsigned long addr, unsigned long end) |
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{ pgd_t *pgd; unsigned long next; |
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BUG_ON(addr >= end); pgd = pgd_offset_k(addr); |
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do { next = pgd_addr_end(addr, end); if (pgd_none_or_clear_bad(pgd)) continue; vunmap_pud_range(pgd, addr, next); } while (pgd++, addr = next, addr != end); |
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} static int vmap_pte_range(pmd_t *pmd, unsigned long addr, |
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unsigned long end, pgprot_t prot, struct page **pages, int *nr) |
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{ pte_t *pte; |
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/* * nr is a running index into the array which helps higher level * callers keep track of where we're up to. */ |
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pte = pte_alloc_kernel(pmd, addr); |
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if (!pte) return -ENOMEM; do { |
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struct page *page = pages[*nr]; if (WARN_ON(!pte_none(*pte))) return -EBUSY; if (WARN_ON(!page)) |
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return -ENOMEM; set_pte_at(&init_mm, addr, pte, mk_pte(page, prot)); |
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(*nr)++; |
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} while (pte++, addr += PAGE_SIZE, addr != end); return 0; } |
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static int vmap_pmd_range(pud_t *pud, unsigned long addr, unsigned long end, pgprot_t prot, struct page **pages, int *nr) |
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{ pmd_t *pmd; unsigned long next; pmd = pmd_alloc(&init_mm, pud, addr); if (!pmd) return -ENOMEM; do { next = pmd_addr_end(addr, end); |
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if (vmap_pte_range(pmd, addr, next, prot, pages, nr)) |
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return -ENOMEM; } while (pmd++, addr = next, addr != end); return 0; } |
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static int vmap_pud_range(pgd_t *pgd, unsigned long addr, unsigned long end, pgprot_t prot, struct page **pages, int *nr) |
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{ pud_t *pud; unsigned long next; pud = pud_alloc(&init_mm, pgd, addr); if (!pud) return -ENOMEM; do { next = pud_addr_end(addr, end); |
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if (vmap_pmd_range(pud, addr, next, prot, pages, nr)) |
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return -ENOMEM; } while (pud++, addr = next, addr != end); return 0; } |
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/* * Set up page tables in kva (addr, end). The ptes shall have prot "prot", and * will have pfns corresponding to the "pages" array. * * Ie. pte at addr+N*PAGE_SIZE shall point to pfn corresponding to pages[N] */ |
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static int vmap_page_range_noflush(unsigned long start, unsigned long end, pgprot_t prot, struct page **pages) |
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{ pgd_t *pgd; unsigned long next; |
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unsigned long addr = start; |
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int err = 0; int nr = 0; |
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BUG_ON(addr >= end); pgd = pgd_offset_k(addr); |
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do { next = pgd_addr_end(addr, end); |
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err = vmap_pud_range(pgd, addr, next, prot, pages, &nr); |
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if (err) |
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return err; |
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} while (pgd++, addr = next, addr != end); |
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|
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return nr; |
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} |
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static int vmap_page_range(unsigned long start, unsigned long end, pgprot_t prot, struct page **pages) { int ret; ret = vmap_page_range_noflush(start, end, prot, pages); flush_cache_vmap(start, end); return ret; } |
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int is_vmalloc_or_module_addr(const void *x) |
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{ /* |
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* ARM, x86-64 and sparc64 put modules in a special place, |
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* and fall back on vmalloc() if that fails. Others * just put it in the vmalloc space. */ #if defined(CONFIG_MODULES) && defined(MODULES_VADDR) unsigned long addr = (unsigned long)x; if (addr >= MODULES_VADDR && addr < MODULES_END) return 1; #endif return is_vmalloc_addr(x); } |
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/* |
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* Walk a vmap address to the struct page it maps. |
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*/ |
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struct page *vmalloc_to_page(const void *vmalloc_addr) |
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{ unsigned long addr = (unsigned long) vmalloc_addr; struct page *page = NULL; pgd_t *pgd = pgd_offset_k(addr); |
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|
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/* * XXX we might need to change this if we add VIRTUAL_BUG_ON for * architectures that do not vmalloc module space */ |
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VIRTUAL_BUG_ON(!is_vmalloc_or_module_addr(vmalloc_addr)); |
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|
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if (!pgd_none(*pgd)) { |
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pud_t *pud = pud_offset(pgd, addr); |
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if (!pud_none(*pud)) { |
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pmd_t *pmd = pmd_offset(pud, addr); |
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if (!pmd_none(*pmd)) { |
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pte_t *ptep, pte; |
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ptep = pte_offset_map(pmd, addr); pte = *ptep; if (pte_present(pte)) page = pte_page(pte); pte_unmap(ptep); } } } return page; } EXPORT_SYMBOL(vmalloc_to_page); /* * Map a vmalloc()-space virtual address to the physical page frame number. */ |
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unsigned long vmalloc_to_pfn(const void *vmalloc_addr) |
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{ return page_to_pfn(vmalloc_to_page(vmalloc_addr)); } EXPORT_SYMBOL(vmalloc_to_pfn); |
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/*** Global kva allocator ***/ #define VM_LAZY_FREE 0x01 #define VM_LAZY_FREEING 0x02 #define VM_VM_AREA 0x04 struct vmap_area { unsigned long va_start; unsigned long va_end; unsigned long flags; struct rb_node rb_node; /* address sorted rbtree */ struct list_head list; /* address sorted list */ struct list_head purge_list; /* "lazy purge" list */ |
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struct vm_struct *vm; |
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struct rcu_head rcu_head; }; static DEFINE_SPINLOCK(vmap_area_lock); |
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static LIST_HEAD(vmap_area_list); |
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static struct rb_root vmap_area_root = RB_ROOT; /* The vmap cache globals are protected by vmap_area_lock */ static struct rb_node *free_vmap_cache; static unsigned long cached_hole_size; static unsigned long cached_vstart; static unsigned long cached_align; |
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static unsigned long vmap_area_pcpu_hole; |
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static struct vmap_area *__find_vmap_area(unsigned long addr) |
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{ |
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struct rb_node *n = vmap_area_root.rb_node; while (n) { struct vmap_area *va; va = rb_entry(n, struct vmap_area, rb_node); if (addr < va->va_start) n = n->rb_left; else if (addr > va->va_start) n = n->rb_right; else return va; } return NULL; } static void __insert_vmap_area(struct vmap_area *va) { struct rb_node **p = &vmap_area_root.rb_node; struct rb_node *parent = NULL; struct rb_node *tmp; while (*p) { |
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struct vmap_area *tmp_va; |
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parent = *p; |
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tmp_va = rb_entry(parent, struct vmap_area, rb_node); if (va->va_start < tmp_va->va_end) |
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p = &(*p)->rb_left; |
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else if (va->va_end > tmp_va->va_start) |
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p = &(*p)->rb_right; else BUG(); } rb_link_node(&va->rb_node, parent, p); rb_insert_color(&va->rb_node, &vmap_area_root); /* address-sort this list so it is usable like the vmlist */ tmp = rb_prev(&va->rb_node); if (tmp) { struct vmap_area *prev; prev = rb_entry(tmp, struct vmap_area, rb_node); list_add_rcu(&va->list, &prev->list); } else list_add_rcu(&va->list, &vmap_area_list); } static void purge_vmap_area_lazy(void); /* * Allocate a region of KVA of the specified size and alignment, within the * vstart and vend. */ static struct vmap_area *alloc_vmap_area(unsigned long size, unsigned long align, unsigned long vstart, unsigned long vend, int node, gfp_t gfp_mask) { struct vmap_area *va; struct rb_node *n; |
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unsigned long addr; |
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int purged = 0; |
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struct vmap_area *first; |
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|
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BUG_ON(!size); |
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BUG_ON(size & ~PAGE_MASK); |
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BUG_ON(!is_power_of_2(align)); |
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|
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va = kmalloc_node(sizeof(struct vmap_area), gfp_mask & GFP_RECLAIM_MASK, node); if (unlikely(!va)) return ERR_PTR(-ENOMEM); retry: spin_lock(&vmap_area_lock); |
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/* * Invalidate cache if we have more permissive parameters. * cached_hole_size notes the largest hole noticed _below_ * the vmap_area cached in free_vmap_cache: if size fits * into that hole, we want to scan from vstart to reuse * the hole instead of allocating above free_vmap_cache. * Note that __free_vmap_area may update free_vmap_cache * without updating cached_hole_size or cached_align. */ if (!free_vmap_cache || size < cached_hole_size || vstart < cached_vstart || align < cached_align) { nocache: cached_hole_size = 0; free_vmap_cache = NULL; } /* record if we encounter less permissive parameters */ cached_vstart = vstart; cached_align = align; /* find starting point for our search */ if (free_vmap_cache) { first = rb_entry(free_vmap_cache, struct vmap_area, rb_node); |
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addr = ALIGN(first->va_end, align); |
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if (addr < vstart) goto nocache; if (addr + size - 1 < addr) goto overflow; } else { addr = ALIGN(vstart, align); if (addr + size - 1 < addr) goto overflow; n = vmap_area_root.rb_node; first = NULL; while (n) { |
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struct vmap_area *tmp; tmp = rb_entry(n, struct vmap_area, rb_node); if (tmp->va_end >= addr) { |
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first = tmp; |
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if (tmp->va_start <= addr) break; n = n->rb_left; } else |
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n = n->rb_right; |
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} |
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if (!first) goto found; |
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} |
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/* from the starting point, walk areas until a suitable hole is found */ |
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while (addr + size > first->va_start && addr + size <= vend) { |
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if (addr + cached_hole_size < first->va_start) cached_hole_size = first->va_start - addr; |
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addr = ALIGN(first->va_end, align); |
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if (addr + size - 1 < addr) goto overflow; n = rb_next(&first->rb_node); if (n) first = rb_entry(n, struct vmap_area, rb_node); else goto found; |
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} |
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va->va_start = addr; va->va_end = addr + size; va->flags = 0; __insert_vmap_area(va); |
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free_vmap_cache = &va->rb_node; |
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spin_unlock(&vmap_area_lock); |
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BUG_ON(va->va_start & (align-1)); BUG_ON(va->va_start < vstart); BUG_ON(va->va_end > vend); |
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return va; |
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overflow: spin_unlock(&vmap_area_lock); if (!purged) { purge_vmap_area_lazy(); purged = 1; goto retry; } if (printk_ratelimit()) printk(KERN_WARNING "vmap allocation for size %lu failed: " "use vmalloc=<size> to increase size. ", size); kfree(va); return ERR_PTR(-EBUSY); |
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} |
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static void __free_vmap_area(struct vmap_area *va) { BUG_ON(RB_EMPTY_NODE(&va->rb_node)); |
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if (free_vmap_cache) { if (va->va_end < cached_vstart) { free_vmap_cache = NULL; } else { struct vmap_area *cache; cache = rb_entry(free_vmap_cache, struct vmap_area, rb_node); if (va->va_start <= cache->va_start) { free_vmap_cache = rb_prev(&va->rb_node); /* * We don't try to update cached_hole_size or * cached_align, but it won't go very wrong. */ } } } |
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rb_erase(&va->rb_node, &vmap_area_root); RB_CLEAR_NODE(&va->rb_node); list_del_rcu(&va->list); |
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/* * Track the highest possible candidate for pcpu area * allocation. Areas outside of vmalloc area can be returned * here too, consider only end addresses which fall inside * vmalloc area proper. */ if (va->va_end > VMALLOC_START && va->va_end <= VMALLOC_END) vmap_area_pcpu_hole = max(vmap_area_pcpu_hole, va->va_end); |
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kfree_rcu(va, rcu_head); |
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} /* * Free a region of KVA allocated by alloc_vmap_area */ static void free_vmap_area(struct vmap_area *va) { spin_lock(&vmap_area_lock); __free_vmap_area(va); spin_unlock(&vmap_area_lock); } /* * Clear the pagetable entries of a given vmap_area */ static void unmap_vmap_area(struct vmap_area *va) { vunmap_page_range(va->va_start, va->va_end); } |
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static void vmap_debug_free_range(unsigned long start, unsigned long end) { /* * Unmap page tables and force a TLB flush immediately if * CONFIG_DEBUG_PAGEALLOC is set. This catches use after free * bugs similarly to those in linear kernel virtual address * space after a page has been freed. * * All the lazy freeing logic is still retained, in order to * minimise intrusiveness of this debugging feature. * * This is going to be *slow* (linear kernel virtual address * debugging doesn't do a broadcast TLB flush so it is a lot * faster). */ #ifdef CONFIG_DEBUG_PAGEALLOC vunmap_page_range(start, end); flush_tlb_kernel_range(start, end); #endif } |
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/* * lazy_max_pages is the maximum amount of virtual address space we gather up * before attempting to purge with a TLB flush. * * There is a tradeoff here: a larger number will cover more kernel page tables * and take slightly longer to purge, but it will linearly reduce the number of * global TLB flushes that must be performed. It would seem natural to scale * this number up linearly with the number of CPUs (because vmapping activity * could also scale linearly with the number of CPUs), however it is likely * that in practice, workloads might be constrained in other ways that mean * vmap activity will not scale linearly with CPUs. Also, I want to be * conservative and not introduce a big latency on huge systems, so go with * a less aggressive log scale. It will still be an improvement over the old * code, and it will be simple to change the scale factor if we find that it * becomes a problem on bigger systems. */ static unsigned long lazy_max_pages(void) { unsigned int log; log = fls(num_online_cpus()); return log * (32UL * 1024 * 1024 / PAGE_SIZE); } static atomic_t vmap_lazy_nr = ATOMIC_INIT(0); |
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/* for per-CPU blocks */ static void purge_fragmented_blocks_allcpus(void); |
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/* |
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* called before a call to iounmap() if the caller wants vm_area_struct's * immediately freed. */ void set_iounmap_nonlazy(void) { atomic_set(&vmap_lazy_nr, lazy_max_pages()+1); } /* |
db64fe022 mm: rewrite vmap ... |
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* Purges all lazily-freed vmap areas. * * If sync is 0 then don't purge if there is already a purge in progress. * If force_flush is 1, then flush kernel TLBs between *start and *end even * if we found no lazy vmap areas to unmap (callers can use this to optimise * their own TLB flushing). * Returns with *start = min(*start, lowest purged address) * *end = max(*end, highest purged address) */ static void __purge_vmap_area_lazy(unsigned long *start, unsigned long *end, int sync, int force_flush) { |
46666d8ac revert "mm: vmall... |
557 |
static DEFINE_SPINLOCK(purge_lock); |
db64fe022 mm: rewrite vmap ... |
558 559 |
LIST_HEAD(valist); struct vmap_area *va; |
cbb766766 mm: fix lazy vmap... |
560 |
struct vmap_area *n_va; |
db64fe022 mm: rewrite vmap ... |
561 562 563 564 565 566 567 568 |
int nr = 0; /* * If sync is 0 but force_flush is 1, we'll go sync anyway but callers * should not expect such behaviour. This just simplifies locking for * the case that isn't actually used at the moment anyway. */ if (!sync && !force_flush) { |
46666d8ac revert "mm: vmall... |
569 |
if (!spin_trylock(&purge_lock)) |
db64fe022 mm: rewrite vmap ... |
570 571 |
return; } else |
46666d8ac revert "mm: vmall... |
572 |
spin_lock(&purge_lock); |
db64fe022 mm: rewrite vmap ... |
573 |
|
02b709df8 mm: purge fragmen... |
574 575 |
if (sync) purge_fragmented_blocks_allcpus(); |
db64fe022 mm: rewrite vmap ... |
576 577 578 579 580 581 582 583 |
rcu_read_lock(); list_for_each_entry_rcu(va, &vmap_area_list, list) { if (va->flags & VM_LAZY_FREE) { if (va->va_start < *start) *start = va->va_start; if (va->va_end > *end) *end = va->va_end; nr += (va->va_end - va->va_start) >> PAGE_SHIFT; |
db64fe022 mm: rewrite vmap ... |
584 585 586 587 588 589 |
list_add_tail(&va->purge_list, &valist); va->flags |= VM_LAZY_FREEING; va->flags &= ~VM_LAZY_FREE; } } rcu_read_unlock(); |
88f500443 vmalloc: remove B... |
590 |
if (nr) |
db64fe022 mm: rewrite vmap ... |
591 |
atomic_sub(nr, &vmap_lazy_nr); |
db64fe022 mm: rewrite vmap ... |
592 593 594 595 596 597 |
if (nr || force_flush) flush_tlb_kernel_range(*start, *end); if (nr) { spin_lock(&vmap_area_lock); |
cbb766766 mm: fix lazy vmap... |
598 |
list_for_each_entry_safe(va, n_va, &valist, purge_list) |
db64fe022 mm: rewrite vmap ... |
599 600 601 |
__free_vmap_area(va); spin_unlock(&vmap_area_lock); } |
46666d8ac revert "mm: vmall... |
602 |
spin_unlock(&purge_lock); |
db64fe022 mm: rewrite vmap ... |
603 604 605 |
} /* |
496850e5f mm: vmalloc failu... |
606 607 608 609 610 611 612 613 614 615 616 |
* Kick off a purge of the outstanding lazy areas. Don't bother if somebody * is already purging. */ static void try_purge_vmap_area_lazy(void) { unsigned long start = ULONG_MAX, end = 0; __purge_vmap_area_lazy(&start, &end, 0, 0); } /* |
db64fe022 mm: rewrite vmap ... |
617 618 619 620 621 |
* Kick off a purge of the outstanding lazy areas. */ static void purge_vmap_area_lazy(void) { unsigned long start = ULONG_MAX, end = 0; |
496850e5f mm: vmalloc failu... |
622 |
__purge_vmap_area_lazy(&start, &end, 1, 0); |
db64fe022 mm: rewrite vmap ... |
623 624 625 |
} /* |
64141da58 vmalloc: eagerly ... |
626 627 628 |
* Free a vmap area, caller ensuring that the area has been unmapped * and flush_cache_vunmap had been called for the correct range * previously. |
db64fe022 mm: rewrite vmap ... |
629 |
*/ |
64141da58 vmalloc: eagerly ... |
630 |
static void free_vmap_area_noflush(struct vmap_area *va) |
db64fe022 mm: rewrite vmap ... |
631 632 633 634 |
{ va->flags |= VM_LAZY_FREE; atomic_add((va->va_end - va->va_start) >> PAGE_SHIFT, &vmap_lazy_nr); if (unlikely(atomic_read(&vmap_lazy_nr) > lazy_max_pages())) |
496850e5f mm: vmalloc failu... |
635 |
try_purge_vmap_area_lazy(); |
db64fe022 mm: rewrite vmap ... |
636 |
} |
b29acbdcf mm: vmalloc fix l... |
637 |
/* |
64141da58 vmalloc: eagerly ... |
638 639 640 641 642 643 644 645 646 647 |
* Free and unmap a vmap area, caller ensuring flush_cache_vunmap had been * called for the correct range previously. */ static void free_unmap_vmap_area_noflush(struct vmap_area *va) { unmap_vmap_area(va); free_vmap_area_noflush(va); } /* |
b29acbdcf mm: vmalloc fix l... |
648 649 650 651 652 653 654 |
* Free and unmap a vmap area */ static void free_unmap_vmap_area(struct vmap_area *va) { flush_cache_vunmap(va->va_start, va->va_end); free_unmap_vmap_area_noflush(va); } |
db64fe022 mm: rewrite vmap ... |
655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 |
static struct vmap_area *find_vmap_area(unsigned long addr) { struct vmap_area *va; spin_lock(&vmap_area_lock); va = __find_vmap_area(addr); spin_unlock(&vmap_area_lock); return va; } static void free_unmap_vmap_area_addr(unsigned long addr) { struct vmap_area *va; va = find_vmap_area(addr); BUG_ON(!va); free_unmap_vmap_area(va); } /*** Per cpu kva allocator ***/ /* * vmap space is limited especially on 32 bit architectures. Ensure there is * room for at least 16 percpu vmap blocks per CPU. */ /* * If we had a constant VMALLOC_START and VMALLOC_END, we'd like to be able * to #define VMALLOC_SPACE (VMALLOC_END-VMALLOC_START). Guess * instead (we just need a rough idea) */ #if BITS_PER_LONG == 32 #define VMALLOC_SPACE (128UL*1024*1024) #else #define VMALLOC_SPACE (128UL*1024*1024*1024) #endif #define VMALLOC_PAGES (VMALLOC_SPACE / PAGE_SIZE) #define VMAP_MAX_ALLOC BITS_PER_LONG /* 256K with 4K pages */ #define VMAP_BBMAP_BITS_MAX 1024 /* 4MB with 4K pages */ #define VMAP_BBMAP_BITS_MIN (VMAP_MAX_ALLOC*2) #define VMAP_MIN(x, y) ((x) < (y) ? (x) : (y)) /* can't use min() */ #define VMAP_MAX(x, y) ((x) > (y) ? (x) : (y)) /* can't use max() */ |
f982f9151 mm: fix wrong vma... |
699 700 701 702 |
#define VMAP_BBMAP_BITS \ VMAP_MIN(VMAP_BBMAP_BITS_MAX, \ VMAP_MAX(VMAP_BBMAP_BITS_MIN, \ VMALLOC_PAGES / roundup_pow_of_two(NR_CPUS) / 16)) |
db64fe022 mm: rewrite vmap ... |
703 704 |
#define VMAP_BLOCK_SIZE (VMAP_BBMAP_BITS * PAGE_SIZE) |
9b4633340 vmap: cope with v... |
705 |
static bool vmap_initialized __read_mostly = false; |
db64fe022 mm: rewrite vmap ... |
706 707 708 |
struct vmap_block_queue { spinlock_t lock; struct list_head free; |
db64fe022 mm: rewrite vmap ... |
709 710 711 712 713 714 715 716 717 |
}; struct vmap_block { spinlock_t lock; struct vmap_area *va; struct vmap_block_queue *vbq; unsigned long free, dirty; DECLARE_BITMAP(alloc_map, VMAP_BBMAP_BITS); DECLARE_BITMAP(dirty_map, VMAP_BBMAP_BITS); |
de5604231 mm: percpu-vmap f... |
718 719 |
struct list_head free_list; struct rcu_head rcu_head; |
02b709df8 mm: purge fragmen... |
720 |
struct list_head purge; |
db64fe022 mm: rewrite vmap ... |
721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 |
}; /* Queue of free and dirty vmap blocks, for allocation and flushing purposes */ static DEFINE_PER_CPU(struct vmap_block_queue, vmap_block_queue); /* * Radix tree of vmap blocks, indexed by address, to quickly find a vmap block * in the free path. Could get rid of this if we change the API to return a * "cookie" from alloc, to be passed to free. But no big deal yet. */ static DEFINE_SPINLOCK(vmap_block_tree_lock); static RADIX_TREE(vmap_block_tree, GFP_ATOMIC); /* * We should probably have a fallback mechanism to allocate virtual memory * out of partially filled vmap blocks. However vmap block sizing should be * fairly reasonable according to the vmalloc size, so it shouldn't be a * big problem. */ static unsigned long addr_to_vb_idx(unsigned long addr) { addr -= VMALLOC_START & ~(VMAP_BLOCK_SIZE-1); addr /= VMAP_BLOCK_SIZE; return addr; } static struct vmap_block *new_vmap_block(gfp_t gfp_mask) { struct vmap_block_queue *vbq; struct vmap_block *vb; struct vmap_area *va; unsigned long vb_idx; int node, err; node = numa_node_id(); vb = kmalloc_node(sizeof(struct vmap_block), gfp_mask & GFP_RECLAIM_MASK, node); if (unlikely(!vb)) return ERR_PTR(-ENOMEM); va = alloc_vmap_area(VMAP_BLOCK_SIZE, VMAP_BLOCK_SIZE, VMALLOC_START, VMALLOC_END, node, gfp_mask); |
ddf9c6d47 vmalloc: remove r... |
766 |
if (IS_ERR(va)) { |
db64fe022 mm: rewrite vmap ... |
767 |
kfree(vb); |
e7d863407 mm: use ERR_CAST |
768 |
return ERR_CAST(va); |
db64fe022 mm: rewrite vmap ... |
769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 |
} err = radix_tree_preload(gfp_mask); if (unlikely(err)) { kfree(vb); free_vmap_area(va); return ERR_PTR(err); } spin_lock_init(&vb->lock); vb->va = va; vb->free = VMAP_BBMAP_BITS; vb->dirty = 0; bitmap_zero(vb->alloc_map, VMAP_BBMAP_BITS); bitmap_zero(vb->dirty_map, VMAP_BBMAP_BITS); INIT_LIST_HEAD(&vb->free_list); |
db64fe022 mm: rewrite vmap ... |
785 786 787 788 789 790 791 792 793 794 795 |
vb_idx = addr_to_vb_idx(va->va_start); spin_lock(&vmap_block_tree_lock); err = radix_tree_insert(&vmap_block_tree, vb_idx, vb); spin_unlock(&vmap_block_tree_lock); BUG_ON(err); radix_tree_preload_end(); vbq = &get_cpu_var(vmap_block_queue); vb->vbq = vbq; spin_lock(&vbq->lock); |
de5604231 mm: percpu-vmap f... |
796 |
list_add_rcu(&vb->free_list, &vbq->free); |
db64fe022 mm: rewrite vmap ... |
797 |
spin_unlock(&vbq->lock); |
3f04ba859 vmalloc: fix use ... |
798 |
put_cpu_var(vmap_block_queue); |
db64fe022 mm: rewrite vmap ... |
799 800 801 |
return vb; } |
db64fe022 mm: rewrite vmap ... |
802 803 804 805 |
static void free_vmap_block(struct vmap_block *vb) { struct vmap_block *tmp; unsigned long vb_idx; |
db64fe022 mm: rewrite vmap ... |
806 807 808 809 810 |
vb_idx = addr_to_vb_idx(vb->va->va_start); spin_lock(&vmap_block_tree_lock); tmp = radix_tree_delete(&vmap_block_tree, vb_idx); spin_unlock(&vmap_block_tree_lock); BUG_ON(tmp != vb); |
64141da58 vmalloc: eagerly ... |
811 |
free_vmap_area_noflush(vb->va); |
22a3c7d18 vmalloc,rcu: Conv... |
812 |
kfree_rcu(vb, rcu_head); |
db64fe022 mm: rewrite vmap ... |
813 |
} |
02b709df8 mm: purge fragmen... |
814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 |
static void purge_fragmented_blocks(int cpu) { LIST_HEAD(purge); struct vmap_block *vb; struct vmap_block *n_vb; struct vmap_block_queue *vbq = &per_cpu(vmap_block_queue, cpu); rcu_read_lock(); list_for_each_entry_rcu(vb, &vbq->free, free_list) { if (!(vb->free + vb->dirty == VMAP_BBMAP_BITS && vb->dirty != VMAP_BBMAP_BITS)) continue; spin_lock(&vb->lock); if (vb->free + vb->dirty == VMAP_BBMAP_BITS && vb->dirty != VMAP_BBMAP_BITS) { vb->free = 0; /* prevent further allocs after releasing lock */ vb->dirty = VMAP_BBMAP_BITS; /* prevent purging it again */ bitmap_fill(vb->alloc_map, VMAP_BBMAP_BITS); bitmap_fill(vb->dirty_map, VMAP_BBMAP_BITS); spin_lock(&vbq->lock); list_del_rcu(&vb->free_list); spin_unlock(&vbq->lock); spin_unlock(&vb->lock); list_add_tail(&vb->purge, &purge); } else spin_unlock(&vb->lock); } rcu_read_unlock(); list_for_each_entry_safe(vb, n_vb, &purge, purge) { list_del(&vb->purge); free_vmap_block(vb); } } static void purge_fragmented_blocks_thiscpu(void) { purge_fragmented_blocks(smp_processor_id()); } static void purge_fragmented_blocks_allcpus(void) { int cpu; for_each_possible_cpu(cpu) purge_fragmented_blocks(cpu); } |
db64fe022 mm: rewrite vmap ... |
861 862 863 864 865 866 |
static void *vb_alloc(unsigned long size, gfp_t gfp_mask) { struct vmap_block_queue *vbq; struct vmap_block *vb; unsigned long addr = 0; unsigned int order; |
02b709df8 mm: purge fragmen... |
867 |
int purge = 0; |
db64fe022 mm: rewrite vmap ... |
868 869 870 871 872 873 874 875 876 877 878 879 |
BUG_ON(size & ~PAGE_MASK); BUG_ON(size > PAGE_SIZE*VMAP_MAX_ALLOC); order = get_order(size); again: rcu_read_lock(); vbq = &get_cpu_var(vmap_block_queue); list_for_each_entry_rcu(vb, &vbq->free, free_list) { int i; spin_lock(&vb->lock); |
02b709df8 mm: purge fragmen... |
880 881 |
if (vb->free < 1UL << order) goto next; |
db64fe022 mm: rewrite vmap ... |
882 883 |
i = bitmap_find_free_region(vb->alloc_map, VMAP_BBMAP_BITS, order); |
02b709df8 mm: purge fragmen... |
884 885 886 887 888 |
if (i < 0) { if (vb->free + vb->dirty == VMAP_BBMAP_BITS) { /* fragmented and no outstanding allocations */ BUG_ON(vb->dirty != VMAP_BBMAP_BITS); purge = 1; |
db64fe022 mm: rewrite vmap ... |
889 |
} |
02b709df8 mm: purge fragmen... |
890 |
goto next; |
db64fe022 mm: rewrite vmap ... |
891 |
} |
02b709df8 mm: purge fragmen... |
892 893 894 895 896 897 898 899 900 901 902 903 |
addr = vb->va->va_start + (i << PAGE_SHIFT); BUG_ON(addr_to_vb_idx(addr) != addr_to_vb_idx(vb->va->va_start)); vb->free -= 1UL << order; if (vb->free == 0) { spin_lock(&vbq->lock); list_del_rcu(&vb->free_list); spin_unlock(&vbq->lock); } spin_unlock(&vb->lock); break; next: |
db64fe022 mm: rewrite vmap ... |
904 905 |
spin_unlock(&vb->lock); } |
02b709df8 mm: purge fragmen... |
906 907 908 |
if (purge) purge_fragmented_blocks_thiscpu(); |
3f04ba859 vmalloc: fix use ... |
909 |
put_cpu_var(vmap_block_queue); |
db64fe022 mm: rewrite vmap ... |
910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 |
rcu_read_unlock(); if (!addr) { vb = new_vmap_block(gfp_mask); if (IS_ERR(vb)) return vb; goto again; } return (void *)addr; } static void vb_free(const void *addr, unsigned long size) { unsigned long offset; unsigned long vb_idx; unsigned int order; struct vmap_block *vb; BUG_ON(size & ~PAGE_MASK); BUG_ON(size > PAGE_SIZE*VMAP_MAX_ALLOC); |
b29acbdcf mm: vmalloc fix l... |
931 932 |
flush_cache_vunmap((unsigned long)addr, (unsigned long)addr + size); |
db64fe022 mm: rewrite vmap ... |
933 934 935 936 937 938 939 940 941 |
order = get_order(size); offset = (unsigned long)addr & (VMAP_BLOCK_SIZE - 1); vb_idx = addr_to_vb_idx((unsigned long)addr); rcu_read_lock(); vb = radix_tree_lookup(&vmap_block_tree, vb_idx); rcu_read_unlock(); BUG_ON(!vb); |
64141da58 vmalloc: eagerly ... |
942 |
vunmap_page_range((unsigned long)addr, (unsigned long)addr + size); |
db64fe022 mm: rewrite vmap ... |
943 |
spin_lock(&vb->lock); |
de5604231 mm: percpu-vmap f... |
944 |
BUG_ON(bitmap_allocate_region(vb->dirty_map, offset >> PAGE_SHIFT, order)); |
d086817dc vmap: remove need... |
945 |
|
db64fe022 mm: rewrite vmap ... |
946 947 |
vb->dirty += 1UL << order; if (vb->dirty == VMAP_BBMAP_BITS) { |
de5604231 mm: percpu-vmap f... |
948 |
BUG_ON(vb->free); |
db64fe022 mm: rewrite vmap ... |
949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 |
spin_unlock(&vb->lock); free_vmap_block(vb); } else spin_unlock(&vb->lock); } /** * vm_unmap_aliases - unmap outstanding lazy aliases in the vmap layer * * The vmap/vmalloc layer lazily flushes kernel virtual mappings primarily * to amortize TLB flushing overheads. What this means is that any page you * have now, may, in a former life, have been mapped into kernel virtual * address by the vmap layer and so there might be some CPUs with TLB entries * still referencing that page (additional to the regular 1:1 kernel mapping). * * vm_unmap_aliases flushes all such lazy mappings. After it returns, we can * be sure that none of the pages we have control over will have any aliases * from the vmap layer. */ void vm_unmap_aliases(void) { unsigned long start = ULONG_MAX, end = 0; int cpu; int flush = 0; |
9b4633340 vmap: cope with v... |
973 974 |
if (unlikely(!vmap_initialized)) return; |
db64fe022 mm: rewrite vmap ... |
975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 |
for_each_possible_cpu(cpu) { struct vmap_block_queue *vbq = &per_cpu(vmap_block_queue, cpu); struct vmap_block *vb; rcu_read_lock(); list_for_each_entry_rcu(vb, &vbq->free, free_list) { int i; spin_lock(&vb->lock); i = find_first_bit(vb->dirty_map, VMAP_BBMAP_BITS); while (i < VMAP_BBMAP_BITS) { unsigned long s, e; int j; j = find_next_zero_bit(vb->dirty_map, VMAP_BBMAP_BITS, i); s = vb->va->va_start + (i << PAGE_SHIFT); e = vb->va->va_start + (j << PAGE_SHIFT); |
db64fe022 mm: rewrite vmap ... |
993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 |
flush = 1; if (s < start) start = s; if (e > end) end = e; i = j; i = find_next_bit(vb->dirty_map, VMAP_BBMAP_BITS, i); } spin_unlock(&vb->lock); } rcu_read_unlock(); } __purge_vmap_area_lazy(&start, &end, 1, flush); } EXPORT_SYMBOL_GPL(vm_unmap_aliases); /** * vm_unmap_ram - unmap linear kernel address space set up by vm_map_ram * @mem: the pointer returned by vm_map_ram * @count: the count passed to that vm_map_ram call (cannot unmap partial) */ void vm_unmap_ram(const void *mem, unsigned int count) { unsigned long size = count << PAGE_SHIFT; unsigned long addr = (unsigned long)mem; BUG_ON(!addr); BUG_ON(addr < VMALLOC_START); BUG_ON(addr > VMALLOC_END); BUG_ON(addr & (PAGE_SIZE-1)); debug_check_no_locks_freed(mem, size); |
cd52858c7 mm: vmalloc make ... |
1029 |
vmap_debug_free_range(addr, addr+size); |
db64fe022 mm: rewrite vmap ... |
1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 |
if (likely(count <= VMAP_MAX_ALLOC)) vb_free(mem, size); else free_unmap_vmap_area_addr(addr); } EXPORT_SYMBOL(vm_unmap_ram); /** * vm_map_ram - map pages linearly into kernel virtual address (vmalloc space) * @pages: an array of pointers to the pages to be mapped * @count: number of pages * @node: prefer to allocate data structures on this node * @prot: memory protection to use. PAGE_KERNEL for regular RAM |
e99c97ade mm: fix kernel-do... |
1044 1045 |
* * Returns: a pointer to the address that has been mapped, or %NULL on failure |
db64fe022 mm: rewrite vmap ... |
1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 |
*/ void *vm_map_ram(struct page **pages, unsigned int count, int node, pgprot_t prot) { unsigned long size = count << PAGE_SHIFT; unsigned long addr; void *mem; if (likely(count <= VMAP_MAX_ALLOC)) { mem = vb_alloc(size, GFP_KERNEL); if (IS_ERR(mem)) return NULL; addr = (unsigned long)mem; } else { struct vmap_area *va; va = alloc_vmap_area(size, PAGE_SIZE, VMALLOC_START, VMALLOC_END, node, GFP_KERNEL); if (IS_ERR(va)) return NULL; addr = va->va_start; mem = (void *)addr; } if (vmap_page_range(addr, addr + size, prot, pages) < 0) { vm_unmap_ram(mem, count); return NULL; } return mem; } EXPORT_SYMBOL(vm_map_ram); |
f0aa66179 vmalloc: implemen... |
1075 |
/** |
be9b7335e mm: add vm_area_a... |
1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 |
* vm_area_add_early - add vmap area early during boot * @vm: vm_struct to add * * This function is used to add fixed kernel vm area to vmlist before * vmalloc_init() is called. @vm->addr, @vm->size, and @vm->flags * should contain proper values and the other fields should be zero. * * DO NOT USE THIS FUNCTION UNLESS YOU KNOW WHAT YOU'RE DOING. */ void __init vm_area_add_early(struct vm_struct *vm) { struct vm_struct *tmp, **p; BUG_ON(vmap_initialized); for (p = &vmlist; (tmp = *p) != NULL; p = &tmp->next) { if (tmp->addr >= vm->addr) { BUG_ON(tmp->addr < vm->addr + vm->size); break; } else BUG_ON(tmp->addr + tmp->size > vm->addr); } vm->next = *p; *p = vm; } /** |
f0aa66179 vmalloc: implemen... |
1102 1103 |
* vm_area_register_early - register vmap area early during boot * @vm: vm_struct to register |
c0c0a2937 vmalloc: add @ali... |
1104 |
* @align: requested alignment |
f0aa66179 vmalloc: implemen... |
1105 1106 1107 1108 1109 1110 1111 1112 |
* * This function is used to register kernel vm area before * vmalloc_init() is called. @vm->size and @vm->flags should contain * proper values on entry and other fields should be zero. On return, * vm->addr contains the allocated address. * * DO NOT USE THIS FUNCTION UNLESS YOU KNOW WHAT YOU'RE DOING. */ |
c0c0a2937 vmalloc: add @ali... |
1113 |
void __init vm_area_register_early(struct vm_struct *vm, size_t align) |
f0aa66179 vmalloc: implemen... |
1114 1115 |
{ static size_t vm_init_off __initdata; |
c0c0a2937 vmalloc: add @ali... |
1116 1117 1118 1119 |
unsigned long addr; addr = ALIGN(VMALLOC_START + vm_init_off, align); vm_init_off = PFN_ALIGN(addr + vm->size) - VMALLOC_START; |
f0aa66179 vmalloc: implemen... |
1120 |
|
c0c0a2937 vmalloc: add @ali... |
1121 |
vm->addr = (void *)addr; |
f0aa66179 vmalloc: implemen... |
1122 |
|
be9b7335e mm: add vm_area_a... |
1123 |
vm_area_add_early(vm); |
f0aa66179 vmalloc: implemen... |
1124 |
} |
db64fe022 mm: rewrite vmap ... |
1125 1126 |
void __init vmalloc_init(void) { |
822c18f2e alpha: fix vmallo... |
1127 1128 |
struct vmap_area *va; struct vm_struct *tmp; |
db64fe022 mm: rewrite vmap ... |
1129 1130 1131 1132 1133 1134 1135 1136 |
int i; for_each_possible_cpu(i) { struct vmap_block_queue *vbq; vbq = &per_cpu(vmap_block_queue, i); spin_lock_init(&vbq->lock); INIT_LIST_HEAD(&vbq->free); |
db64fe022 mm: rewrite vmap ... |
1137 |
} |
9b4633340 vmap: cope with v... |
1138 |
|
822c18f2e alpha: fix vmallo... |
1139 1140 |
/* Import existing vmlist entries. */ for (tmp = vmlist; tmp; tmp = tmp->next) { |
43ebdac42 vmalloc: use kzal... |
1141 |
va = kzalloc(sizeof(struct vmap_area), GFP_NOWAIT); |
822c18f2e alpha: fix vmallo... |
1142 1143 1144 1145 1146 |
va->flags = tmp->flags | VM_VM_AREA; va->va_start = (unsigned long)tmp->addr; va->va_end = va->va_start + tmp->size; __insert_vmap_area(va); } |
ca23e405e vmalloc: implemen... |
1147 1148 |
vmap_area_pcpu_hole = VMALLOC_END; |
9b4633340 vmap: cope with v... |
1149 |
vmap_initialized = true; |
db64fe022 mm: rewrite vmap ... |
1150 |
} |
8fc489850 vmalloc: add un/m... |
1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 |
/** * map_kernel_range_noflush - map kernel VM area with the specified pages * @addr: start of the VM area to map * @size: size of the VM area to map * @prot: page protection flags to use * @pages: pages to map * * Map PFN_UP(@size) pages at @addr. The VM area @addr and @size * specify should have been allocated using get_vm_area() and its * friends. * * NOTE: * This function does NOT do any cache flushing. The caller is * responsible for calling flush_cache_vmap() on to-be-mapped areas * before calling this function. * * RETURNS: * The number of pages mapped on success, -errno on failure. */ int map_kernel_range_noflush(unsigned long addr, unsigned long size, pgprot_t prot, struct page **pages) { return vmap_page_range_noflush(addr, addr + size, prot, pages); } /** * unmap_kernel_range_noflush - unmap kernel VM area * @addr: start of the VM area to unmap * @size: size of the VM area to unmap * * Unmap PFN_UP(@size) pages at @addr. The VM area @addr and @size * specify should have been allocated using get_vm_area() and its * friends. * * NOTE: * This function does NOT do any cache flushing. The caller is * responsible for calling flush_cache_vunmap() on to-be-mapped areas * before calling this function and flush_tlb_kernel_range() after. */ void unmap_kernel_range_noflush(unsigned long addr, unsigned long size) { vunmap_page_range(addr, addr + size); } |
81e88fdc4 ACPI, APEI, Gener... |
1194 |
EXPORT_SYMBOL_GPL(unmap_kernel_range_noflush); |
8fc489850 vmalloc: add un/m... |
1195 1196 1197 1198 1199 1200 1201 1202 1203 |
/** * unmap_kernel_range - unmap kernel VM area and flush cache and TLB * @addr: start of the VM area to unmap * @size: size of the VM area to unmap * * Similar to unmap_kernel_range_noflush() but flushes vcache before * the unmapping and tlb after. */ |
db64fe022 mm: rewrite vmap ... |
1204 1205 1206 |
void unmap_kernel_range(unsigned long addr, unsigned long size) { unsigned long end = addr + size; |
f6fcba701 vmalloc: call flu... |
1207 1208 |
flush_cache_vunmap(addr, end); |
db64fe022 mm: rewrite vmap ... |
1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 |
vunmap_page_range(addr, end); flush_tlb_kernel_range(addr, end); } int map_vm_area(struct vm_struct *area, pgprot_t prot, struct page ***pages) { unsigned long addr = (unsigned long)area->addr; unsigned long end = addr + area->size - PAGE_SIZE; int err; err = vmap_page_range(addr, end, prot, *pages); if (err > 0) { *pages += err; err = 0; } return err; } EXPORT_SYMBOL_GPL(map_vm_area); /*** Old vmalloc interfaces ***/ DEFINE_RWLOCK(vmlist_lock); struct vm_struct *vmlist; |
f5252e009 mm: avoid null po... |
1232 |
static void setup_vmalloc_vm(struct vm_struct *vm, struct vmap_area *va, |
cf88c7900 vmalloc: separate... |
1233 1234 |
unsigned long flags, void *caller) { |
cf88c7900 vmalloc: separate... |
1235 1236 1237 1238 |
vm->flags = flags; vm->addr = (void *)va->va_start; vm->size = va->va_end - va->va_start; vm->caller = caller; |
db1aecafe mm/vmalloc.c: cha... |
1239 |
va->vm = vm; |
cf88c7900 vmalloc: separate... |
1240 |
va->flags |= VM_VM_AREA; |
f5252e009 mm: avoid null po... |
1241 |
} |
cf88c7900 vmalloc: separate... |
1242 |
|
f5252e009 mm: avoid null po... |
1243 1244 1245 1246 1247 |
static void insert_vmalloc_vmlist(struct vm_struct *vm) { struct vm_struct *tmp, **p; vm->flags &= ~VM_UNLIST; |
cf88c7900 vmalloc: separate... |
1248 1249 1250 1251 1252 1253 1254 1255 1256 |
write_lock(&vmlist_lock); for (p = &vmlist; (tmp = *p) != NULL; p = &tmp->next) { if (tmp->addr >= vm->addr) break; } vm->next = *p; *p = vm; write_unlock(&vmlist_lock); } |
f5252e009 mm: avoid null po... |
1257 1258 1259 1260 1261 1262 |
static void insert_vmalloc_vm(struct vm_struct *vm, struct vmap_area *va, unsigned long flags, void *caller) { setup_vmalloc_vm(vm, va, flags, caller); insert_vmalloc_vmlist(vm); } |
db64fe022 mm: rewrite vmap ... |
1263 |
static struct vm_struct *__get_vm_area_node(unsigned long size, |
2dca6999e mm, perf_event: M... |
1264 1265 |
unsigned long align, unsigned long flags, unsigned long start, unsigned long end, int node, gfp_t gfp_mask, void *caller) |
db64fe022 mm: rewrite vmap ... |
1266 |
{ |
0006526d7 mm/vmalloc.c: rem... |
1267 |
struct vmap_area *va; |
db64fe022 mm: rewrite vmap ... |
1268 |
struct vm_struct *area; |
1da177e4c Linux-2.6.12-rc2 |
1269 |
|
52fd24ca1 [PATCH] __vmalloc... |
1270 |
BUG_ON(in_interrupt()); |
1da177e4c Linux-2.6.12-rc2 |
1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 |
if (flags & VM_IOREMAP) { int bit = fls(size); if (bit > IOREMAP_MAX_ORDER) bit = IOREMAP_MAX_ORDER; else if (bit < PAGE_SHIFT) bit = PAGE_SHIFT; align = 1ul << bit; } |
db64fe022 mm: rewrite vmap ... |
1281 |
|
1da177e4c Linux-2.6.12-rc2 |
1282 |
size = PAGE_ALIGN(size); |
31be83095 [PATCH] Fix stran... |
1283 1284 |
if (unlikely(!size)) return NULL; |
1da177e4c Linux-2.6.12-rc2 |
1285 |
|
cf88c7900 vmalloc: separate... |
1286 |
area = kzalloc_node(sizeof(*area), gfp_mask & GFP_RECLAIM_MASK, node); |
1da177e4c Linux-2.6.12-rc2 |
1287 1288 |
if (unlikely(!area)) return NULL; |
1da177e4c Linux-2.6.12-rc2 |
1289 1290 1291 1292 |
/* * We always allocate a guard page. */ size += PAGE_SIZE; |
db64fe022 mm: rewrite vmap ... |
1293 1294 1295 1296 |
va = alloc_vmap_area(size, align, start, end, node, gfp_mask); if (IS_ERR(va)) { kfree(area); return NULL; |
1da177e4c Linux-2.6.12-rc2 |
1297 |
} |
1da177e4c Linux-2.6.12-rc2 |
1298 |
|
f5252e009 mm: avoid null po... |
1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 |
/* * When this function is called from __vmalloc_node_range, * we do not add vm_struct to vmlist here to avoid * accessing uninitialized members of vm_struct such as * pages and nr_pages fields. They will be set later. * To distinguish it from others, we use a VM_UNLIST flag. */ if (flags & VM_UNLIST) setup_vmalloc_vm(area, va, flags, caller); else insert_vmalloc_vm(area, va, flags, caller); |
1da177e4c Linux-2.6.12-rc2 |
1310 |
return area; |
1da177e4c Linux-2.6.12-rc2 |
1311 |
} |
930fc45a4 [PATCH] vmalloc_node |
1312 1313 1314 |
struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags, unsigned long start, unsigned long end) { |
2dca6999e mm, perf_event: M... |
1315 |
return __get_vm_area_node(size, 1, flags, start, end, -1, GFP_KERNEL, |
230169693 vmallocinfo: add ... |
1316 |
__builtin_return_address(0)); |
930fc45a4 [PATCH] vmalloc_node |
1317 |
} |
5992b6dac lguest: export sy... |
1318 |
EXPORT_SYMBOL_GPL(__get_vm_area); |
930fc45a4 [PATCH] vmalloc_node |
1319 |
|
c29686129 vmalloc: add __ge... |
1320 1321 1322 1323 |
struct vm_struct *__get_vm_area_caller(unsigned long size, unsigned long flags, unsigned long start, unsigned long end, void *caller) { |
2dca6999e mm, perf_event: M... |
1324 |
return __get_vm_area_node(size, 1, flags, start, end, -1, GFP_KERNEL, |
c29686129 vmalloc: add __ge... |
1325 1326 |
caller); } |
1da177e4c Linux-2.6.12-rc2 |
1327 |
/** |
183ff22bb spelling fixes: mm/ |
1328 |
* get_vm_area - reserve a contiguous kernel virtual area |
1da177e4c Linux-2.6.12-rc2 |
1329 1330 1331 1332 1333 1334 1335 1336 1337 |
* @size: size of the area * @flags: %VM_IOREMAP for I/O mappings or VM_ALLOC * * Search an area of @size in the kernel virtual mapping area, * and reserved it for out purposes. Returns the area descriptor * on success or %NULL on failure. */ struct vm_struct *get_vm_area(unsigned long size, unsigned long flags) { |
2dca6999e mm, perf_event: M... |
1338 |
return __get_vm_area_node(size, 1, flags, VMALLOC_START, VMALLOC_END, |
230169693 vmallocinfo: add ... |
1339 1340 1341 1342 1343 1344 |
-1, GFP_KERNEL, __builtin_return_address(0)); } struct vm_struct *get_vm_area_caller(unsigned long size, unsigned long flags, void *caller) { |
2dca6999e mm, perf_event: M... |
1345 |
return __get_vm_area_node(size, 1, flags, VMALLOC_START, VMALLOC_END, |
230169693 vmallocinfo: add ... |
1346 |
-1, GFP_KERNEL, caller); |
1da177e4c Linux-2.6.12-rc2 |
1347 |
} |
db64fe022 mm: rewrite vmap ... |
1348 |
static struct vm_struct *find_vm_area(const void *addr) |
833423143 [PATCH] mm: intro... |
1349 |
{ |
db64fe022 mm: rewrite vmap ... |
1350 |
struct vmap_area *va; |
833423143 [PATCH] mm: intro... |
1351 |
|
db64fe022 mm: rewrite vmap ... |
1352 1353 |
va = find_vmap_area((unsigned long)addr); if (va && va->flags & VM_VM_AREA) |
db1aecafe mm/vmalloc.c: cha... |
1354 |
return va->vm; |
1da177e4c Linux-2.6.12-rc2 |
1355 |
|
1da177e4c Linux-2.6.12-rc2 |
1356 |
return NULL; |
1da177e4c Linux-2.6.12-rc2 |
1357 |
} |
7856dfeb2 [PATCH] x86_64: F... |
1358 |
/** |
183ff22bb spelling fixes: mm/ |
1359 |
* remove_vm_area - find and remove a continuous kernel virtual area |
7856dfeb2 [PATCH] x86_64: F... |
1360 1361 1362 1363 1364 1365 |
* @addr: base address * * Search for the kernel VM area starting at @addr, and remove it. * This function returns the found VM area, but using it is NOT safe * on SMP machines, except for its size or flags. */ |
b3bdda02a vmalloc: add cons... |
1366 |
struct vm_struct *remove_vm_area(const void *addr) |
7856dfeb2 [PATCH] x86_64: F... |
1367 |
{ |
db64fe022 mm: rewrite vmap ... |
1368 1369 1370 1371 |
struct vmap_area *va; va = find_vmap_area((unsigned long)addr); if (va && va->flags & VM_VM_AREA) { |
db1aecafe mm/vmalloc.c: cha... |
1372 |
struct vm_struct *vm = va->vm; |
f5252e009 mm: avoid null po... |
1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 |
if (!(vm->flags & VM_UNLIST)) { struct vm_struct *tmp, **p; /* * remove from list and disallow access to * this vm_struct before unmap. (address range * confliction is maintained by vmap.) */ write_lock(&vmlist_lock); for (p = &vmlist; (tmp = *p) != vm; p = &tmp->next) ; *p = tmp->next; write_unlock(&vmlist_lock); } |
db64fe022 mm: rewrite vmap ... |
1387 |
|
dd32c2799 vmalloc: unmap vm... |
1388 1389 1390 |
vmap_debug_free_range(va->va_start, va->va_end); free_unmap_vmap_area(va); vm->size -= PAGE_SIZE; |
db64fe022 mm: rewrite vmap ... |
1391 1392 1393 |
return vm; } return NULL; |
7856dfeb2 [PATCH] x86_64: F... |
1394 |
} |
b3bdda02a vmalloc: add cons... |
1395 |
static void __vunmap(const void *addr, int deallocate_pages) |
1da177e4c Linux-2.6.12-rc2 |
1396 1397 1398 1399 1400 1401 1402 |
{ struct vm_struct *area; if (!addr) return; if ((PAGE_SIZE-1) & (unsigned long)addr) { |
4c8573e25 Use WARN() in mm/... |
1403 1404 |
WARN(1, KERN_ERR "Trying to vfree() bad address (%p) ", addr); |
1da177e4c Linux-2.6.12-rc2 |
1405 1406 1407 1408 1409 |
return; } area = remove_vm_area(addr); if (unlikely(!area)) { |
4c8573e25 Use WARN() in mm/... |
1410 1411 |
WARN(1, KERN_ERR "Trying to vfree() nonexistent vm area (%p) ", |
1da177e4c Linux-2.6.12-rc2 |
1412 |
addr); |
1da177e4c Linux-2.6.12-rc2 |
1413 1414 |
return; } |
9a11b49a8 [PATCH] lockdep: ... |
1415 |
debug_check_no_locks_freed(addr, area->size); |
3ac7fe5a4 infrastructure to... |
1416 |
debug_check_no_obj_freed(addr, area->size); |
9a11b49a8 [PATCH] lockdep: ... |
1417 |
|
1da177e4c Linux-2.6.12-rc2 |
1418 1419 1420 1421 |
if (deallocate_pages) { int i; for (i = 0; i < area->nr_pages; i++) { |
bf53d6f8f vmalloc: clean up... |
1422 1423 1424 1425 |
struct page *page = area->pages[i]; BUG_ON(!page); __free_page(page); |
1da177e4c Linux-2.6.12-rc2 |
1426 |
} |
8757d5fa6 [PATCH] mm: fix o... |
1427 |
if (area->flags & VM_VPAGES) |
1da177e4c Linux-2.6.12-rc2 |
1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 |
vfree(area->pages); else kfree(area->pages); } kfree(area); return; } /** * vfree - release memory allocated by vmalloc() |
1da177e4c Linux-2.6.12-rc2 |
1439 1440 |
* @addr: memory base address * |
183ff22bb spelling fixes: mm/ |
1441 |
* Free the virtually continuous memory area starting at @addr, as |
80e93effc [PATCH] update kf... |
1442 1443 |
* obtained from vmalloc(), vmalloc_32() or __vmalloc(). If @addr is * NULL, no operation is performed. |
1da177e4c Linux-2.6.12-rc2 |
1444 |
* |
80e93effc [PATCH] update kf... |
1445 |
* Must not be called in interrupt context. |
1da177e4c Linux-2.6.12-rc2 |
1446 |
*/ |
b3bdda02a vmalloc: add cons... |
1447 |
void vfree(const void *addr) |
1da177e4c Linux-2.6.12-rc2 |
1448 1449 |
{ BUG_ON(in_interrupt()); |
89219d37a kmemleak: Add the... |
1450 1451 |
kmemleak_free(addr); |
1da177e4c Linux-2.6.12-rc2 |
1452 1453 |
__vunmap(addr, 1); } |
1da177e4c Linux-2.6.12-rc2 |
1454 1455 1456 1457 |
EXPORT_SYMBOL(vfree); /** * vunmap - release virtual mapping obtained by vmap() |
1da177e4c Linux-2.6.12-rc2 |
1458 1459 1460 1461 1462 |
* @addr: memory base address * * Free the virtually contiguous memory area starting at @addr, * which was created from the page array passed to vmap(). * |
80e93effc [PATCH] update kf... |
1463 |
* Must not be called in interrupt context. |
1da177e4c Linux-2.6.12-rc2 |
1464 |
*/ |
b3bdda02a vmalloc: add cons... |
1465 |
void vunmap(const void *addr) |
1da177e4c Linux-2.6.12-rc2 |
1466 1467 |
{ BUG_ON(in_interrupt()); |
34754b69a x86: make vmap ye... |
1468 |
might_sleep(); |
1da177e4c Linux-2.6.12-rc2 |
1469 1470 |
__vunmap(addr, 0); } |
1da177e4c Linux-2.6.12-rc2 |
1471 1472 1473 1474 |
EXPORT_SYMBOL(vunmap); /** * vmap - map an array of pages into virtually contiguous space |
1da177e4c Linux-2.6.12-rc2 |
1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 |
* @pages: array of page pointers * @count: number of pages to map * @flags: vm_area->flags * @prot: page protection for the mapping * * Maps @count pages from @pages into contiguous kernel virtual * space. */ void *vmap(struct page **pages, unsigned int count, unsigned long flags, pgprot_t prot) { struct vm_struct *area; |
34754b69a x86: make vmap ye... |
1487 |
might_sleep(); |
4481374ce mm: replace vario... |
1488 |
if (count > totalram_pages) |
1da177e4c Linux-2.6.12-rc2 |
1489 |
return NULL; |
230169693 vmallocinfo: add ... |
1490 1491 |
area = get_vm_area_caller((count << PAGE_SHIFT), flags, __builtin_return_address(0)); |
1da177e4c Linux-2.6.12-rc2 |
1492 1493 |
if (!area) return NULL; |
230169693 vmallocinfo: add ... |
1494 |
|
1da177e4c Linux-2.6.12-rc2 |
1495 1496 1497 1498 1499 1500 1501 |
if (map_vm_area(area, prot, &pages)) { vunmap(area->addr); return NULL; } return area->addr; } |
1da177e4c Linux-2.6.12-rc2 |
1502 |
EXPORT_SYMBOL(vmap); |
2dca6999e mm, perf_event: M... |
1503 1504 |
static void *__vmalloc_node(unsigned long size, unsigned long align, gfp_t gfp_mask, pgprot_t prot, |
db64fe022 mm: rewrite vmap ... |
1505 |
int node, void *caller); |
e31d9eb5c make __vmalloc_ar... |
1506 |
static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask, |
230169693 vmallocinfo: add ... |
1507 |
pgprot_t prot, int node, void *caller) |
1da177e4c Linux-2.6.12-rc2 |
1508 |
{ |
22943ab11 mm: print vmalloc... |
1509 |
const int order = 0; |
1da177e4c Linux-2.6.12-rc2 |
1510 1511 |
struct page **pages; unsigned int nr_pages, array_size, i; |
976d6dfbb vmalloc(): adjust... |
1512 |
gfp_t nested_gfp = (gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO; |
1da177e4c Linux-2.6.12-rc2 |
1513 1514 1515 1516 1517 1518 |
nr_pages = (area->size - PAGE_SIZE) >> PAGE_SHIFT; array_size = (nr_pages * sizeof(struct page *)); area->nr_pages = nr_pages; /* Please note that the recursion is strictly bounded. */ |
8757d5fa6 [PATCH] mm: fix o... |
1519 |
if (array_size > PAGE_SIZE) { |
976d6dfbb vmalloc(): adjust... |
1520 |
pages = __vmalloc_node(array_size, 1, nested_gfp|__GFP_HIGHMEM, |
230169693 vmallocinfo: add ... |
1521 |
PAGE_KERNEL, node, caller); |
8757d5fa6 [PATCH] mm: fix o... |
1522 |
area->flags |= VM_VPAGES; |
286e1ea3a [PATCH] vmalloc()... |
1523 |
} else { |
976d6dfbb vmalloc(): adjust... |
1524 |
pages = kmalloc_node(array_size, nested_gfp, node); |
286e1ea3a [PATCH] vmalloc()... |
1525 |
} |
1da177e4c Linux-2.6.12-rc2 |
1526 |
area->pages = pages; |
230169693 vmallocinfo: add ... |
1527 |
area->caller = caller; |
1da177e4c Linux-2.6.12-rc2 |
1528 1529 1530 1531 1532 |
if (!area->pages) { remove_vm_area(area->addr); kfree(area); return NULL; } |
1da177e4c Linux-2.6.12-rc2 |
1533 1534 |
for (i = 0; i < area->nr_pages; i++) { |
bf53d6f8f vmalloc: clean up... |
1535 |
struct page *page; |
22943ab11 mm: print vmalloc... |
1536 |
gfp_t tmp_mask = gfp_mask | __GFP_NOWARN; |
bf53d6f8f vmalloc: clean up... |
1537 |
|
930fc45a4 [PATCH] vmalloc_node |
1538 |
if (node < 0) |
22943ab11 mm: print vmalloc... |
1539 |
page = alloc_page(tmp_mask); |
930fc45a4 [PATCH] vmalloc_node |
1540 |
else |
22943ab11 mm: print vmalloc... |
1541 |
page = alloc_pages_node(node, tmp_mask, order); |
bf53d6f8f vmalloc: clean up... |
1542 1543 |
if (unlikely(!page)) { |
1da177e4c Linux-2.6.12-rc2 |
1544 1545 1546 1547 |
/* Successfully allocated i pages, free them in __vunmap() */ area->nr_pages = i; goto fail; } |
bf53d6f8f vmalloc: clean up... |
1548 |
area->pages[i] = page; |
1da177e4c Linux-2.6.12-rc2 |
1549 1550 1551 1552 1553 1554 1555 |
} if (map_vm_area(area, prot, &pages)) goto fail; return area->addr; fail: |
3ee9a4f08 mm: neaten warn_a... |
1556 1557 1558 |
warn_alloc_failed(gfp_mask, order, "vmalloc: allocation failure, allocated %ld of %ld bytes ", |
22943ab11 mm: print vmalloc... |
1559 |
(area->nr_pages*PAGE_SIZE), area->size); |
1da177e4c Linux-2.6.12-rc2 |
1560 1561 1562 1563 1564 |
vfree(area->addr); return NULL; } /** |
d0a21265d mm: unify module_... |
1565 |
* __vmalloc_node_range - allocate virtually contiguous memory |
1da177e4c Linux-2.6.12-rc2 |
1566 |
* @size: allocation size |
2dca6999e mm, perf_event: M... |
1567 |
* @align: desired alignment |
d0a21265d mm: unify module_... |
1568 1569 |
* @start: vm area range start * @end: vm area range end |
1da177e4c Linux-2.6.12-rc2 |
1570 1571 |
* @gfp_mask: flags for the page level allocator * @prot: protection mask for the allocated pages |
d44e0780b [PATCH] kernel-do... |
1572 |
* @node: node to use for allocation or -1 |
c85d194bf docbook: fix vmal... |
1573 |
* @caller: caller's return address |
1da177e4c Linux-2.6.12-rc2 |
1574 1575 1576 1577 1578 |
* * Allocate enough pages to cover @size from the page level * allocator with @gfp_mask flags. Map them into contiguous * kernel virtual space, using a pagetable protection of @prot. */ |
d0a21265d mm: unify module_... |
1579 1580 1581 |
void *__vmalloc_node_range(unsigned long size, unsigned long align, unsigned long start, unsigned long end, gfp_t gfp_mask, pgprot_t prot, int node, void *caller) |
1da177e4c Linux-2.6.12-rc2 |
1582 1583 |
{ struct vm_struct *area; |
89219d37a kmemleak: Add the... |
1584 1585 |
void *addr; unsigned long real_size = size; |
1da177e4c Linux-2.6.12-rc2 |
1586 1587 |
size = PAGE_ALIGN(size); |
4481374ce mm: replace vario... |
1588 |
if (!size || (size >> PAGE_SHIFT) > totalram_pages) |
de7d2b567 mm/vmalloc.c: rep... |
1589 |
goto fail; |
1da177e4c Linux-2.6.12-rc2 |
1590 |
|
f5252e009 mm: avoid null po... |
1591 1592 |
area = __get_vm_area_node(size, align, VM_ALLOC | VM_UNLIST, start, end, node, gfp_mask, caller); |
1da177e4c Linux-2.6.12-rc2 |
1593 |
if (!area) |
de7d2b567 mm/vmalloc.c: rep... |
1594 |
goto fail; |
1da177e4c Linux-2.6.12-rc2 |
1595 |
|
89219d37a kmemleak: Add the... |
1596 |
addr = __vmalloc_area_node(area, gfp_mask, prot, node, caller); |
1368edf06 mm: vmalloc: chec... |
1597 1598 |
if (!addr) return NULL; |
89219d37a kmemleak: Add the... |
1599 1600 |
/* |
f5252e009 mm: avoid null po... |
1601 1602 1603 1604 1605 1606 |
* In this function, newly allocated vm_struct is not added * to vmlist at __get_vm_area_node(). so, it is added here. */ insert_vmalloc_vmlist(area); /* |
89219d37a kmemleak: Add the... |
1607 1608 1609 1610 1611 1612 1613 |
* A ref_count = 3 is needed because the vm_struct and vmap_area * structures allocated in the __get_vm_area_node() function contain * references to the virtual address of the vmalloc'ed block. */ kmemleak_alloc(addr, real_size, 3, gfp_mask); return addr; |
de7d2b567 mm/vmalloc.c: rep... |
1614 1615 1616 1617 1618 1619 1620 |
fail: warn_alloc_failed(gfp_mask, 0, "vmalloc: allocation failure: %lu bytes ", real_size); return NULL; |
1da177e4c Linux-2.6.12-rc2 |
1621 |
} |
d0a21265d mm: unify module_... |
1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 |
/** * __vmalloc_node - allocate virtually contiguous memory * @size: allocation size * @align: desired alignment * @gfp_mask: flags for the page level allocator * @prot: protection mask for the allocated pages * @node: node to use for allocation or -1 * @caller: caller's return address * * Allocate enough pages to cover @size from the page level * allocator with @gfp_mask flags. Map them into contiguous * kernel virtual space, using a pagetable protection of @prot. */ static void *__vmalloc_node(unsigned long size, unsigned long align, gfp_t gfp_mask, pgprot_t prot, int node, void *caller) { return __vmalloc_node_range(size, align, VMALLOC_START, VMALLOC_END, gfp_mask, prot, node, caller); } |
930fc45a4 [PATCH] vmalloc_node |
1642 1643 |
void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot) { |
2dca6999e mm, perf_event: M... |
1644 |
return __vmalloc_node(size, 1, gfp_mask, prot, -1, |
230169693 vmallocinfo: add ... |
1645 |
__builtin_return_address(0)); |
930fc45a4 [PATCH] vmalloc_node |
1646 |
} |
1da177e4c Linux-2.6.12-rc2 |
1647 |
EXPORT_SYMBOL(__vmalloc); |
e1ca7788d mm: add vzalloc()... |
1648 1649 1650 1651 1652 1653 |
static inline void *__vmalloc_node_flags(unsigned long size, int node, gfp_t flags) { return __vmalloc_node(size, 1, flags, PAGE_KERNEL, node, __builtin_return_address(0)); } |
1da177e4c Linux-2.6.12-rc2 |
1654 1655 |
/** * vmalloc - allocate virtually contiguous memory |
1da177e4c Linux-2.6.12-rc2 |
1656 |
* @size: allocation size |
1da177e4c Linux-2.6.12-rc2 |
1657 1658 1659 |
* Allocate enough pages to cover @size from the page level * allocator and map them into contiguous kernel virtual space. * |
c1c8897f8 Spelling fix: "co... |
1660 |
* For tight control over page level allocator and protection flags |
1da177e4c Linux-2.6.12-rc2 |
1661 1662 1663 1664 |
* use __vmalloc() instead. */ void *vmalloc(unsigned long size) { |
e1ca7788d mm: add vzalloc()... |
1665 |
return __vmalloc_node_flags(size, -1, GFP_KERNEL | __GFP_HIGHMEM); |
1da177e4c Linux-2.6.12-rc2 |
1666 |
} |
1da177e4c Linux-2.6.12-rc2 |
1667 |
EXPORT_SYMBOL(vmalloc); |
930fc45a4 [PATCH] vmalloc_node |
1668 |
/** |
e1ca7788d mm: add vzalloc()... |
1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 |
* vzalloc - allocate virtually contiguous memory with zero fill * @size: allocation size * Allocate enough pages to cover @size from the page level * allocator and map them into contiguous kernel virtual space. * The memory allocated is set to zero. * * For tight control over page level allocator and protection flags * use __vmalloc() instead. */ void *vzalloc(unsigned long size) { return __vmalloc_node_flags(size, -1, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO); } EXPORT_SYMBOL(vzalloc); /** |
ead04089b [PATCH] Fix kerne... |
1686 1687 |
* vmalloc_user - allocate zeroed virtually contiguous memory for userspace * @size: allocation size |
833423143 [PATCH] mm: intro... |
1688 |
* |
ead04089b [PATCH] Fix kerne... |
1689 1690 |
* The resulting memory area is zeroed so it can be mapped to userspace * without leaking data. |
833423143 [PATCH] mm: intro... |
1691 1692 1693 1694 1695 |
*/ void *vmalloc_user(unsigned long size) { struct vm_struct *area; void *ret; |
2dca6999e mm, perf_event: M... |
1696 1697 |
ret = __vmalloc_node(size, SHMLBA, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO, |
848778483 mm: vmalloc impro... |
1698 |
PAGE_KERNEL, -1, __builtin_return_address(0)); |
2b4ac44e7 [PATCH] vmalloc: ... |
1699 |
if (ret) { |
db64fe022 mm: rewrite vmap ... |
1700 |
area = find_vm_area(ret); |
2b4ac44e7 [PATCH] vmalloc: ... |
1701 |
area->flags |= VM_USERMAP; |
2b4ac44e7 [PATCH] vmalloc: ... |
1702 |
} |
833423143 [PATCH] mm: intro... |
1703 1704 1705 1706 1707 |
return ret; } EXPORT_SYMBOL(vmalloc_user); /** |
930fc45a4 [PATCH] vmalloc_node |
1708 |
* vmalloc_node - allocate memory on a specific node |
930fc45a4 [PATCH] vmalloc_node |
1709 |
* @size: allocation size |
d44e0780b [PATCH] kernel-do... |
1710 |
* @node: numa node |
930fc45a4 [PATCH] vmalloc_node |
1711 1712 1713 1714 |
* * Allocate enough pages to cover @size from the page level * allocator and map them into contiguous kernel virtual space. * |
c1c8897f8 Spelling fix: "co... |
1715 |
* For tight control over page level allocator and protection flags |
930fc45a4 [PATCH] vmalloc_node |
1716 1717 1718 1719 |
* use __vmalloc() instead. */ void *vmalloc_node(unsigned long size, int node) { |
2dca6999e mm, perf_event: M... |
1720 |
return __vmalloc_node(size, 1, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL, |
230169693 vmallocinfo: add ... |
1721 |
node, __builtin_return_address(0)); |
930fc45a4 [PATCH] vmalloc_node |
1722 1723 |
} EXPORT_SYMBOL(vmalloc_node); |
e1ca7788d mm: add vzalloc()... |
1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 |
/** * vzalloc_node - allocate memory on a specific node with zero fill * @size: allocation size * @node: numa node * * Allocate enough pages to cover @size from the page level * allocator and map them into contiguous kernel virtual space. * The memory allocated is set to zero. * * For tight control over page level allocator and protection flags * use __vmalloc_node() instead. */ void *vzalloc_node(unsigned long size, int node) { return __vmalloc_node_flags(size, node, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO); } EXPORT_SYMBOL(vzalloc_node); |
4dc3b16ba [PATCH] DocBook: ... |
1742 1743 1744 |
#ifndef PAGE_KERNEL_EXEC # define PAGE_KERNEL_EXEC PAGE_KERNEL #endif |
1da177e4c Linux-2.6.12-rc2 |
1745 1746 |
/** * vmalloc_exec - allocate virtually contiguous, executable memory |
1da177e4c Linux-2.6.12-rc2 |
1747 1748 1749 1750 1751 1752 |
* @size: allocation size * * Kernel-internal function to allocate enough pages to cover @size * the page level allocator and map them into contiguous and * executable kernel virtual space. * |
c1c8897f8 Spelling fix: "co... |
1753 |
* For tight control over page level allocator and protection flags |
1da177e4c Linux-2.6.12-rc2 |
1754 1755 |
* use __vmalloc() instead. */ |
1da177e4c Linux-2.6.12-rc2 |
1756 1757 |
void *vmalloc_exec(unsigned long size) { |
2dca6999e mm, perf_event: M... |
1758 |
return __vmalloc_node(size, 1, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL_EXEC, |
848778483 mm: vmalloc impro... |
1759 |
-1, __builtin_return_address(0)); |
1da177e4c Linux-2.6.12-rc2 |
1760 |
} |
0d08e0d3a [PATCH] x86-64: F... |
1761 |
#if defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA32) |
7ac674f52 vmalloc_32 should... |
1762 |
#define GFP_VMALLOC32 GFP_DMA32 | GFP_KERNEL |
0d08e0d3a [PATCH] x86-64: F... |
1763 |
#elif defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA) |
7ac674f52 vmalloc_32 should... |
1764 |
#define GFP_VMALLOC32 GFP_DMA | GFP_KERNEL |
0d08e0d3a [PATCH] x86-64: F... |
1765 1766 1767 |
#else #define GFP_VMALLOC32 GFP_KERNEL #endif |
1da177e4c Linux-2.6.12-rc2 |
1768 1769 |
/** * vmalloc_32 - allocate virtually contiguous memory (32bit addressable) |
1da177e4c Linux-2.6.12-rc2 |
1770 1771 1772 1773 1774 1775 1776 |
* @size: allocation size * * Allocate enough 32bit PA addressable pages to cover @size from the * page level allocator and map them into contiguous kernel virtual space. */ void *vmalloc_32(unsigned long size) { |
2dca6999e mm, perf_event: M... |
1777 |
return __vmalloc_node(size, 1, GFP_VMALLOC32, PAGE_KERNEL, |
848778483 mm: vmalloc impro... |
1778 |
-1, __builtin_return_address(0)); |
1da177e4c Linux-2.6.12-rc2 |
1779 |
} |
1da177e4c Linux-2.6.12-rc2 |
1780 |
EXPORT_SYMBOL(vmalloc_32); |
833423143 [PATCH] mm: intro... |
1781 |
/** |
ead04089b [PATCH] Fix kerne... |
1782 |
* vmalloc_32_user - allocate zeroed virtually contiguous 32bit memory |
833423143 [PATCH] mm: intro... |
1783 |
* @size: allocation size |
ead04089b [PATCH] Fix kerne... |
1784 1785 1786 |
* * The resulting memory area is 32bit addressable and zeroed so it can be * mapped to userspace without leaking data. |
833423143 [PATCH] mm: intro... |
1787 1788 1789 1790 1791 |
*/ void *vmalloc_32_user(unsigned long size) { struct vm_struct *area; void *ret; |
2dca6999e mm, perf_event: M... |
1792 |
ret = __vmalloc_node(size, 1, GFP_VMALLOC32 | __GFP_ZERO, PAGE_KERNEL, |
848778483 mm: vmalloc impro... |
1793 |
-1, __builtin_return_address(0)); |
2b4ac44e7 [PATCH] vmalloc: ... |
1794 |
if (ret) { |
db64fe022 mm: rewrite vmap ... |
1795 |
area = find_vm_area(ret); |
2b4ac44e7 [PATCH] vmalloc: ... |
1796 |
area->flags |= VM_USERMAP; |
2b4ac44e7 [PATCH] vmalloc: ... |
1797 |
} |
833423143 [PATCH] mm: intro... |
1798 1799 1800 |
return ret; } EXPORT_SYMBOL(vmalloc_32_user); |
d0107eb07 kcore: fix vread/... |
1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 |
/* * small helper routine , copy contents to buf from addr. * If the page is not present, fill zero. */ static int aligned_vread(char *buf, char *addr, unsigned long count) { struct page *p; int copied = 0; while (count) { unsigned long offset, length; offset = (unsigned long)addr & ~PAGE_MASK; length = PAGE_SIZE - offset; if (length > count) length = count; p = vmalloc_to_page(addr); /* * To do safe access to this _mapped_ area, we need * lock. But adding lock here means that we need to add * overhead of vmalloc()/vfree() calles for this _debug_ * interface, rarely used. Instead of that, we'll use * kmap() and get small overhead in this access function. */ if (p) { /* * we can expect USER0 is not used (see vread/vwrite's * function description) */ |
9b04c5fec mm: remove the se... |
1831 |
void *map = kmap_atomic(p); |
d0107eb07 kcore: fix vread/... |
1832 |
memcpy(buf, map + offset, length); |
9b04c5fec mm: remove the se... |
1833 |
kunmap_atomic(map); |
d0107eb07 kcore: fix vread/... |
1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 |
} else memset(buf, 0, length); addr += length; buf += length; copied += length; count -= length; } return copied; } static int aligned_vwrite(char *buf, char *addr, unsigned long count) { struct page *p; int copied = 0; while (count) { unsigned long offset, length; offset = (unsigned long)addr & ~PAGE_MASK; length = PAGE_SIZE - offset; if (length > count) length = count; p = vmalloc_to_page(addr); /* * To do safe access to this _mapped_ area, we need * lock. But adding lock here means that we need to add * overhead of vmalloc()/vfree() calles for this _debug_ * interface, rarely used. Instead of that, we'll use * kmap() and get small overhead in this access function. */ if (p) { /* * we can expect USER0 is not used (see vread/vwrite's * function description) */ |
9b04c5fec mm: remove the se... |
1870 |
void *map = kmap_atomic(p); |
d0107eb07 kcore: fix vread/... |
1871 |
memcpy(map + offset, buf, length); |
9b04c5fec mm: remove the se... |
1872 |
kunmap_atomic(map); |
d0107eb07 kcore: fix vread/... |
1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 |
} addr += length; buf += length; copied += length; count -= length; } return copied; } /** * vread() - read vmalloc area in a safe way. * @buf: buffer for reading data * @addr: vm address. * @count: number of bytes to be read. * * Returns # of bytes which addr and buf should be increased. * (same number to @count). Returns 0 if [addr...addr+count) doesn't * includes any intersect with alive vmalloc area. * * This function checks that addr is a valid vmalloc'ed area, and * copy data from that area to a given buffer. If the given memory range * of [addr...addr+count) includes some valid address, data is copied to * proper area of @buf. If there are memory holes, they'll be zero-filled. * IOREMAP area is treated as memory hole and no copy is done. * * If [addr...addr+count) doesn't includes any intersects with alive * vm_struct area, returns 0. * @buf should be kernel's buffer. Because this function uses KM_USER0, * the caller should guarantee KM_USER0 is not used. * * Note: In usual ops, vread() is never necessary because the caller * should know vmalloc() area is valid and can use memcpy(). * This is for routines which have to access vmalloc area without * any informaion, as /dev/kmem. * */ |
1da177e4c Linux-2.6.12-rc2 |
1909 1910 1911 1912 |
long vread(char *buf, char *addr, unsigned long count) { struct vm_struct *tmp; char *vaddr, *buf_start = buf; |
d0107eb07 kcore: fix vread/... |
1913 |
unsigned long buflen = count; |
1da177e4c Linux-2.6.12-rc2 |
1914 1915 1916 1917 1918 1919 1920 |
unsigned long n; /* Don't allow overflow */ if ((unsigned long) addr + count < count) count = -(unsigned long) addr; read_lock(&vmlist_lock); |
d0107eb07 kcore: fix vread/... |
1921 |
for (tmp = vmlist; count && tmp; tmp = tmp->next) { |
1da177e4c Linux-2.6.12-rc2 |
1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 |
vaddr = (char *) tmp->addr; if (addr >= vaddr + tmp->size - PAGE_SIZE) continue; while (addr < vaddr) { if (count == 0) goto finished; *buf = '\0'; buf++; addr++; count--; } n = vaddr + tmp->size - PAGE_SIZE - addr; |
d0107eb07 kcore: fix vread/... |
1934 1935 1936 1937 1938 1939 1940 1941 1942 |
if (n > count) n = count; if (!(tmp->flags & VM_IOREMAP)) aligned_vread(buf, addr, n); else /* IOREMAP area is treated as memory hole */ memset(buf, 0, n); buf += n; addr += n; count -= n; |
1da177e4c Linux-2.6.12-rc2 |
1943 1944 1945 |
} finished: read_unlock(&vmlist_lock); |
d0107eb07 kcore: fix vread/... |
1946 1947 1948 1949 1950 1951 1952 1953 |
if (buf == buf_start) return 0; /* zero-fill memory holes */ if (buf != buf_start + buflen) memset(buf, 0, buflen - (buf - buf_start)); return buflen; |
1da177e4c Linux-2.6.12-rc2 |
1954 |
} |
d0107eb07 kcore: fix vread/... |
1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 |
/** * vwrite() - write vmalloc area in a safe way. * @buf: buffer for source data * @addr: vm address. * @count: number of bytes to be read. * * Returns # of bytes which addr and buf should be incresed. * (same number to @count). * If [addr...addr+count) doesn't includes any intersect with valid * vmalloc area, returns 0. * * This function checks that addr is a valid vmalloc'ed area, and * copy data from a buffer to the given addr. If specified range of * [addr...addr+count) includes some valid address, data is copied from * proper area of @buf. If there are memory holes, no copy to hole. * IOREMAP area is treated as memory hole and no copy is done. * * If [addr...addr+count) doesn't includes any intersects with alive * vm_struct area, returns 0. * @buf should be kernel's buffer. Because this function uses KM_USER0, * the caller should guarantee KM_USER0 is not used. * * Note: In usual ops, vwrite() is never necessary because the caller * should know vmalloc() area is valid and can use memcpy(). * This is for routines which have to access vmalloc area without * any informaion, as /dev/kmem. |
d0107eb07 kcore: fix vread/... |
1981 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1982 1983 1984 |
long vwrite(char *buf, char *addr, unsigned long count) { struct vm_struct *tmp; |
d0107eb07 kcore: fix vread/... |
1985 1986 1987 |
char *vaddr; unsigned long n, buflen; int copied = 0; |
1da177e4c Linux-2.6.12-rc2 |
1988 1989 1990 1991 |
/* Don't allow overflow */ if ((unsigned long) addr + count < count) count = -(unsigned long) addr; |
d0107eb07 kcore: fix vread/... |
1992 |
buflen = count; |
1da177e4c Linux-2.6.12-rc2 |
1993 1994 |
read_lock(&vmlist_lock); |
d0107eb07 kcore: fix vread/... |
1995 |
for (tmp = vmlist; count && tmp; tmp = tmp->next) { |
1da177e4c Linux-2.6.12-rc2 |
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 |
vaddr = (char *) tmp->addr; if (addr >= vaddr + tmp->size - PAGE_SIZE) continue; while (addr < vaddr) { if (count == 0) goto finished; buf++; addr++; count--; } n = vaddr + tmp->size - PAGE_SIZE - addr; |
d0107eb07 kcore: fix vread/... |
2007 2008 2009 2010 2011 2012 2013 2014 2015 |
if (n > count) n = count; if (!(tmp->flags & VM_IOREMAP)) { aligned_vwrite(buf, addr, n); copied++; } buf += n; addr += n; count -= n; |
1da177e4c Linux-2.6.12-rc2 |
2016 2017 2018 |
} finished: read_unlock(&vmlist_lock); |
d0107eb07 kcore: fix vread/... |
2019 2020 2021 |
if (!copied) return 0; return buflen; |
1da177e4c Linux-2.6.12-rc2 |
2022 |
} |
833423143 [PATCH] mm: intro... |
2023 2024 2025 |
/** * remap_vmalloc_range - map vmalloc pages to userspace |
833423143 [PATCH] mm: intro... |
2026 2027 2028 |
* @vma: vma to cover (map full range of vma) * @addr: vmalloc memory * @pgoff: number of pages into addr before first page to map |
7682486b3 mm: fix various k... |
2029 2030 |
* * Returns: 0 for success, -Exxx on failure |
833423143 [PATCH] mm: intro... |
2031 2032 2033 2034 2035 |
* * This function checks that addr is a valid vmalloc'ed area, and * that it is big enough to cover the vma. Will return failure if * that criteria isn't met. * |
72fd4a35a [PATCH] Numerous ... |
2036 |
* Similar to remap_pfn_range() (see mm/memory.c) |
833423143 [PATCH] mm: intro... |
2037 2038 2039 2040 2041 2042 2043 |
*/ int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, unsigned long pgoff) { struct vm_struct *area; unsigned long uaddr = vma->vm_start; unsigned long usize = vma->vm_end - vma->vm_start; |
833423143 [PATCH] mm: intro... |
2044 2045 2046 |
if ((PAGE_SIZE-1) & (unsigned long)addr) return -EINVAL; |
db64fe022 mm: rewrite vmap ... |
2047 |
area = find_vm_area(addr); |
833423143 [PATCH] mm: intro... |
2048 |
if (!area) |
db64fe022 mm: rewrite vmap ... |
2049 |
return -EINVAL; |
833423143 [PATCH] mm: intro... |
2050 2051 |
if (!(area->flags & VM_USERMAP)) |
db64fe022 mm: rewrite vmap ... |
2052 |
return -EINVAL; |
833423143 [PATCH] mm: intro... |
2053 2054 |
if (usize + (pgoff << PAGE_SHIFT) > area->size - PAGE_SIZE) |
db64fe022 mm: rewrite vmap ... |
2055 |
return -EINVAL; |
833423143 [PATCH] mm: intro... |
2056 2057 2058 2059 |
addr += pgoff << PAGE_SHIFT; do { struct page *page = vmalloc_to_page(addr); |
db64fe022 mm: rewrite vmap ... |
2060 |
int ret; |
833423143 [PATCH] mm: intro... |
2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 |
ret = vm_insert_page(vma, uaddr, page); if (ret) return ret; uaddr += PAGE_SIZE; addr += PAGE_SIZE; usize -= PAGE_SIZE; } while (usize > 0); /* Prevent "things" like memory migration? VM_flags need a cleanup... */ vma->vm_flags |= VM_RESERVED; |
db64fe022 mm: rewrite vmap ... |
2072 |
return 0; |
833423143 [PATCH] mm: intro... |
2073 2074 |
} EXPORT_SYMBOL(remap_vmalloc_range); |
1eeb66a1b move die notifier... |
2075 2076 2077 2078 2079 2080 2081 |
/* * Implement a stub for vmalloc_sync_all() if the architecture chose not to * have one. */ void __attribute__((weak)) vmalloc_sync_all(void) { } |
5f4352fbf Allocate and free... |
2082 |
|
2f569afd9 CONFIG_HIGHPTE vs... |
2083 |
static int f(pte_t *pte, pgtable_t table, unsigned long addr, void *data) |
5f4352fbf Allocate and free... |
2084 |
{ |
cd12909cb xen: map foreign ... |
2085 2086 2087 2088 2089 2090 |
pte_t ***p = data; if (p) { *(*p) = pte; (*p)++; } |
5f4352fbf Allocate and free... |
2091 2092 2093 2094 2095 2096 |
return 0; } /** * alloc_vm_area - allocate a range of kernel address space * @size: size of the area |
cd12909cb xen: map foreign ... |
2097 |
* @ptes: returns the PTEs for the address space |
7682486b3 mm: fix various k... |
2098 2099 |
* * Returns: NULL on failure, vm_struct on success |
5f4352fbf Allocate and free... |
2100 2101 2102 |
* * This function reserves a range of kernel address space, and * allocates pagetables to map that range. No actual mappings |
cd12909cb xen: map foreign ... |
2103 2104 2105 2106 |
* are created. * * If @ptes is non-NULL, pointers to the PTEs (in init_mm) * allocated for the VM area are returned. |
5f4352fbf Allocate and free... |
2107 |
*/ |
cd12909cb xen: map foreign ... |
2108 |
struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes) |
5f4352fbf Allocate and free... |
2109 2110 |
{ struct vm_struct *area; |
230169693 vmallocinfo: add ... |
2111 2112 |
area = get_vm_area_caller(size, VM_IOREMAP, __builtin_return_address(0)); |
5f4352fbf Allocate and free... |
2113 2114 2115 2116 2117 2118 2119 2120 |
if (area == NULL) return NULL; /* * This ensures that page tables are constructed for this region * of kernel virtual address space and mapped into init_mm. */ if (apply_to_page_range(&init_mm, (unsigned long)area->addr, |
cd12909cb xen: map foreign ... |
2121 |
size, f, ptes ? &ptes : NULL)) { |
5f4352fbf Allocate and free... |
2122 2123 2124 |
free_vm_area(area); return NULL; } |
5f4352fbf Allocate and free... |
2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 |
return area; } EXPORT_SYMBOL_GPL(alloc_vm_area); void free_vm_area(struct vm_struct *area) { struct vm_struct *ret; ret = remove_vm_area(area->addr); BUG_ON(ret != area); kfree(area); } EXPORT_SYMBOL_GPL(free_vm_area); |
a10aa5798 vmalloc: show vma... |
2137 |
|
4f8b02b4e vmalloc: pcpu_get... |
2138 |
#ifdef CONFIG_SMP |
ca23e405e vmalloc: implemen... |
2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 |
static struct vmap_area *node_to_va(struct rb_node *n) { return n ? rb_entry(n, struct vmap_area, rb_node) : NULL; } /** * pvm_find_next_prev - find the next and prev vmap_area surrounding @end * @end: target address * @pnext: out arg for the next vmap_area * @pprev: out arg for the previous vmap_area * * Returns: %true if either or both of next and prev are found, * %false if no vmap_area exists * * Find vmap_areas end addresses of which enclose @end. ie. if not * NULL, *pnext->va_end > @end and *pprev->va_end <= @end. */ static bool pvm_find_next_prev(unsigned long end, struct vmap_area **pnext, struct vmap_area **pprev) { struct rb_node *n = vmap_area_root.rb_node; struct vmap_area *va = NULL; while (n) { va = rb_entry(n, struct vmap_area, rb_node); if (end < va->va_end) n = n->rb_left; else if (end > va->va_end) n = n->rb_right; else break; } if (!va) return false; if (va->va_end > end) { *pnext = va; *pprev = node_to_va(rb_prev(&(*pnext)->rb_node)); } else { *pprev = va; *pnext = node_to_va(rb_next(&(*pprev)->rb_node)); } return true; } /** * pvm_determine_end - find the highest aligned address between two vmap_areas * @pnext: in/out arg for the next vmap_area * @pprev: in/out arg for the previous vmap_area * @align: alignment * * Returns: determined end address * * Find the highest aligned address between *@pnext and *@pprev below * VMALLOC_END. *@pnext and *@pprev are adjusted so that the aligned * down address is between the end addresses of the two vmap_areas. * * Please note that the address returned by this function may fall * inside *@pnext vmap_area. The caller is responsible for checking * that. */ static unsigned long pvm_determine_end(struct vmap_area **pnext, struct vmap_area **pprev, unsigned long align) { const unsigned long vmalloc_end = VMALLOC_END & ~(align - 1); unsigned long addr; if (*pnext) addr = min((*pnext)->va_start & ~(align - 1), vmalloc_end); else addr = vmalloc_end; while (*pprev && (*pprev)->va_end > addr) { *pnext = *pprev; *pprev = node_to_va(rb_prev(&(*pnext)->rb_node)); } return addr; } /** * pcpu_get_vm_areas - allocate vmalloc areas for percpu allocator * @offsets: array containing offset of each area * @sizes: array containing size of each area * @nr_vms: the number of areas to allocate * @align: alignment, all entries in @offsets and @sizes must be aligned to this |
ca23e405e vmalloc: implemen... |
2228 2229 2230 2231 2232 2233 |
* * Returns: kmalloc'd vm_struct pointer array pointing to allocated * vm_structs on success, %NULL on failure * * Percpu allocator wants to use congruent vm areas so that it can * maintain the offsets among percpu areas. This function allocates |
ec3f64fc9 mm: remove gfp ma... |
2234 2235 2236 2237 |
* congruent vmalloc areas for it with GFP_KERNEL. These areas tend to * be scattered pretty far, distance between two areas easily going up * to gigabytes. To avoid interacting with regular vmallocs, these * areas are allocated from top. |
ca23e405e vmalloc: implemen... |
2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 |
* * Despite its complicated look, this allocator is rather simple. It * does everything top-down and scans areas from the end looking for * matching slot. While scanning, if any of the areas overlaps with * existing vmap_area, the base address is pulled down to fit the * area. Scanning is repeated till all the areas fit and then all * necessary data structres are inserted and the result is returned. */ struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets, const size_t *sizes, int nr_vms, |
ec3f64fc9 mm: remove gfp ma... |
2248 |
size_t align) |
ca23e405e vmalloc: implemen... |
2249 2250 2251 2252 2253 2254 2255 2256 |
{ const unsigned long vmalloc_start = ALIGN(VMALLOC_START, align); const unsigned long vmalloc_end = VMALLOC_END & ~(align - 1); struct vmap_area **vas, *prev, *next; struct vm_struct **vms; int area, area2, last_area, term_area; unsigned long base, start, end, last_end; bool purged = false; |
ca23e405e vmalloc: implemen... |
2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 |
/* verify parameters and allocate data structures */ BUG_ON(align & ~PAGE_MASK || !is_power_of_2(align)); for (last_area = 0, area = 0; area < nr_vms; area++) { start = offsets[area]; end = start + sizes[area]; /* is everything aligned properly? */ BUG_ON(!IS_ALIGNED(offsets[area], align)); BUG_ON(!IS_ALIGNED(sizes[area], align)); /* detect the area with the highest address */ if (start > offsets[last_area]) last_area = area; for (area2 = 0; area2 < nr_vms; area2++) { unsigned long start2 = offsets[area2]; unsigned long end2 = start2 + sizes[area2]; if (area2 == area) continue; BUG_ON(start2 >= start && start2 < end); BUG_ON(end2 <= end && end2 > start); } } last_end = offsets[last_area] + sizes[last_area]; if (vmalloc_end - vmalloc_start < last_end) { WARN_ON(true); return NULL; } |
4d67d8605 mm: use kcalloc()... |
2288 2289 |
vms = kcalloc(nr_vms, sizeof(vms[0]), GFP_KERNEL); vas = kcalloc(nr_vms, sizeof(vas[0]), GFP_KERNEL); |
ca23e405e vmalloc: implemen... |
2290 |
if (!vas || !vms) |
f1db7afd9 mm/vmalloc.c: eli... |
2291 |
goto err_free2; |
ca23e405e vmalloc: implemen... |
2292 2293 |
for (area = 0; area < nr_vms; area++) { |
ec3f64fc9 mm: remove gfp ma... |
2294 2295 |
vas[area] = kzalloc(sizeof(struct vmap_area), GFP_KERNEL); vms[area] = kzalloc(sizeof(struct vm_struct), GFP_KERNEL); |
ca23e405e vmalloc: implemen... |
2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 |
if (!vas[area] || !vms[area]) goto err_free; } retry: spin_lock(&vmap_area_lock); /* start scanning - we scan from the top, begin with the last area */ area = term_area = last_area; start = offsets[area]; end = start + sizes[area]; if (!pvm_find_next_prev(vmap_area_pcpu_hole, &next, &prev)) { base = vmalloc_end - last_end; goto found; } base = pvm_determine_end(&next, &prev, align) - end; while (true) { BUG_ON(next && next->va_end <= base + end); BUG_ON(prev && prev->va_end > base + end); /* * base might have underflowed, add last_end before * comparing. */ if (base + last_end < vmalloc_start + last_end) { spin_unlock(&vmap_area_lock); if (!purged) { purge_vmap_area_lazy(); purged = true; goto retry; } goto err_free; } /* * If next overlaps, move base downwards so that it's * right below next and then recheck. */ if (next && next->va_start < base + end) { base = pvm_determine_end(&next, &prev, align) - end; term_area = area; continue; } /* * If prev overlaps, shift down next and prev and move * base so that it's right below new next and then * recheck. */ if (prev && prev->va_end > base + start) { next = prev; prev = node_to_va(rb_prev(&next->rb_node)); base = pvm_determine_end(&next, &prev, align) - end; term_area = area; continue; } /* * This area fits, move on to the previous one. If * the previous one is the terminal one, we're done. */ area = (area + nr_vms - 1) % nr_vms; if (area == term_area) break; start = offsets[area]; end = start + sizes[area]; pvm_find_next_prev(base + end, &next, &prev); } found: /* we've found a fitting base, insert all va's */ for (area = 0; area < nr_vms; area++) { struct vmap_area *va = vas[area]; va->va_start = base + offsets[area]; va->va_end = va->va_start + sizes[area]; __insert_vmap_area(va); } vmap_area_pcpu_hole = base + offsets[last_area]; spin_unlock(&vmap_area_lock); /* insert all vm's */ for (area = 0; area < nr_vms; area++) insert_vmalloc_vm(vms[area], vas[area], VM_ALLOC, pcpu_get_vm_areas); kfree(vas); return vms; err_free: for (area = 0; area < nr_vms; area++) { |
f1db7afd9 mm/vmalloc.c: eli... |
2389 2390 |
kfree(vas[area]); kfree(vms[area]); |
ca23e405e vmalloc: implemen... |
2391 |
} |
f1db7afd9 mm/vmalloc.c: eli... |
2392 |
err_free2: |
ca23e405e vmalloc: implemen... |
2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 |
kfree(vas); kfree(vms); return NULL; } /** * pcpu_free_vm_areas - free vmalloc areas for percpu allocator * @vms: vm_struct pointer array returned by pcpu_get_vm_areas() * @nr_vms: the number of allocated areas * * Free vm_structs and the array allocated by pcpu_get_vm_areas(). */ void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms) { int i; for (i = 0; i < nr_vms; i++) free_vm_area(vms[i]); kfree(vms); } |
4f8b02b4e vmalloc: pcpu_get... |
2413 |
#endif /* CONFIG_SMP */ |
a10aa5798 vmalloc: show vma... |
2414 2415 2416 |
#ifdef CONFIG_PROC_FS static void *s_start(struct seq_file *m, loff_t *pos) |
e199b5d1f vmalloc: annotate... |
2417 |
__acquires(&vmlist_lock) |
a10aa5798 vmalloc: show vma... |
2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 |
{ loff_t n = *pos; struct vm_struct *v; read_lock(&vmlist_lock); v = vmlist; while (n > 0 && v) { n--; v = v->next; } if (!n) return v; return NULL; } static void *s_next(struct seq_file *m, void *p, loff_t *pos) { struct vm_struct *v = p; ++*pos; return v->next; } static void s_stop(struct seq_file *m, void *p) |
e199b5d1f vmalloc: annotate... |
2444 |
__releases(&vmlist_lock) |
a10aa5798 vmalloc: show vma... |
2445 2446 2447 |
{ read_unlock(&vmlist_lock); } |
a47a126ad vmallocinfo: add ... |
2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 |
static void show_numa_info(struct seq_file *m, struct vm_struct *v) { if (NUMA_BUILD) { unsigned int nr, *counters = m->private; if (!counters) return; memset(counters, 0, nr_node_ids * sizeof(unsigned int)); for (nr = 0; nr < v->nr_pages; nr++) counters[page_to_nid(v->pages[nr])]++; for_each_node_state(nr, N_HIGH_MEMORY) if (counters[nr]) seq_printf(m, " N%u=%u", nr, counters[nr]); } } |
a10aa5798 vmalloc: show vma... |
2466 2467 2468 2469 2470 2471 |
static int s_show(struct seq_file *m, void *p) { struct vm_struct *v = p; seq_printf(m, "0x%p-0x%p %7ld", v->addr, v->addr + v->size, v->size); |
62c70bce8 mm: convert sprin... |
2472 2473 |
if (v->caller) seq_printf(m, " %pS", v->caller); |
230169693 vmallocinfo: add ... |
2474 |
|
a10aa5798 vmalloc: show vma... |
2475 2476 2477 2478 |
if (v->nr_pages) seq_printf(m, " pages=%d", v->nr_pages); if (v->phys_addr) |
ffa71f33a x86, ioremap: Fix... |
2479 |
seq_printf(m, " phys=%llx", (unsigned long long)v->phys_addr); |
a10aa5798 vmalloc: show vma... |
2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 |
if (v->flags & VM_IOREMAP) seq_printf(m, " ioremap"); if (v->flags & VM_ALLOC) seq_printf(m, " vmalloc"); if (v->flags & VM_MAP) seq_printf(m, " vmap"); if (v->flags & VM_USERMAP) seq_printf(m, " user"); if (v->flags & VM_VPAGES) seq_printf(m, " vpages"); |
a47a126ad vmallocinfo: add ... |
2495 |
show_numa_info(m, v); |
a10aa5798 vmalloc: show vma... |
2496 2497 2498 2499 |
seq_putc(m, ' '); return 0; } |
5f6a6a9c4 proc: move /proc/... |
2500 |
static const struct seq_operations vmalloc_op = { |
a10aa5798 vmalloc: show vma... |
2501 2502 2503 2504 2505 |
.start = s_start, .next = s_next, .stop = s_stop, .show = s_show, }; |
5f6a6a9c4 proc: move /proc/... |
2506 2507 2508 2509 2510 |
static int vmalloc_open(struct inode *inode, struct file *file) { unsigned int *ptr = NULL; int ret; |
51980ac9e mm/vmalloc.c: che... |
2511 |
if (NUMA_BUILD) { |
5f6a6a9c4 proc: move /proc/... |
2512 |
ptr = kmalloc(nr_node_ids * sizeof(unsigned int), GFP_KERNEL); |
51980ac9e mm/vmalloc.c: che... |
2513 2514 2515 |
if (ptr == NULL) return -ENOMEM; } |
5f6a6a9c4 proc: move /proc/... |
2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 |
ret = seq_open(file, &vmalloc_op); if (!ret) { struct seq_file *m = file->private_data; m->private = ptr; } else kfree(ptr); return ret; } static const struct file_operations proc_vmalloc_operations = { .open = vmalloc_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release_private, }; static int __init proc_vmalloc_init(void) { proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations); return 0; } module_init(proc_vmalloc_init); |
a10aa5798 vmalloc: show vma... |
2538 |
#endif |