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mm/init-mm.c
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// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/mm_types.h> #include <linux/rbtree.h> #include <linux/rwsem.h> #include <linux/spinlock.h> #include <linux/list.h> #include <linux/cpumask.h> |
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#include <linux/atomic.h> |
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#include <linux/user_namespace.h> |
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#include <asm/pgtable.h> |
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#include <asm/mmu.h> #ifndef INIT_MM_CONTEXT #define INIT_MM_CONTEXT(name) #endif |
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/* * For dynamically allocated mm_structs, there is a dynamically sized cpumask * at the end of the structure, the size of which depends on the maximum CPU * number the system can see. That way we allocate only as much memory for * mm_cpumask() as needed for the hundreds, or thousands of processes that * a system typically runs. * * Since there is only one init_mm in the entire system, keep it simple * and size this cpu_bitmask to NR_CPUS. */ |
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struct mm_struct init_mm = { .mm_rb = RB_ROOT, .pgd = swapper_pg_dir, .mm_users = ATOMIC_INIT(2), .mm_count = ATOMIC_INIT(1), .mmap_sem = __RWSEM_INITIALIZER(init_mm.mmap_sem), .page_table_lock = __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock), |
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.arg_lock = __SPIN_LOCK_UNLOCKED(init_mm.arg_lock), |
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.mmlist = LIST_HEAD_INIT(init_mm.mmlist), |
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.user_ns = &init_user_ns, |
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.cpu_bitmap = { [BITS_TO_LONGS(NR_CPUS)] = 0}, |
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INIT_MM_CONTEXT(init_mm) |
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}; |