15 May, 2018
1 commit
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Allows mempools to be embedded in other structs, getting rid of a
pointer indirection from allocation fastpaths.mempool_exit() is safe to call on an uninitialized but zeroed mempool.
Signed-off-by: Kent Overstreet
Signed-off-by: Jens Axboe
02 Nov, 2017
1 commit
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Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.By default all files without license information are under the default
license of the kernel, which is GPL version 2.Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier. The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.How this work was done:
Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
- file had no licensing information it it.
- file was a */uapi/* one with no licensing information in it,
- file was a */uapi/* one with existing licensing information,Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne. Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed. Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.Criteria used to select files for SPDX license identifier tagging was:
- Files considered eligible had to be source code files.
- Make and config files were included as candidates if they contained >5
lines of source
- File already had some variant of a license header in it (even if
Reviewed-by: Philippe Ombredanne
Reviewed-by: Thomas Gleixner
Signed-off-by: Greg Kroah-Hartman
20 May, 2016
1 commit
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Attach the malloc attribute to a few allocation functions. This helps
gcc generate better code by telling it that the return value doesn't
alias any existing pointers (which is even more valuable given the
pessimizations implied by -fno-strict-aliasing).A simple example of what this allows gcc to do can be seen by looking at
the last part of drm_atomic_helper_plane_reset:plane->state = kzalloc(sizeof(*plane->state), GFP_KERNEL);
if (plane->state) {
plane->state->plane = plane;
plane->state->rotation = BIT(DRM_ROTATE_0);
}which compiles to
e8 99 bf d6 ff callq ffffffff8116d540
48 85 c0 test %rax,%rax
48 89 83 40 02 00 00 mov %rax,0x240(%rbx)
74 11 je ffffffff814015c4
48 89 18 mov %rbx,(%rax)
48 8b 83 40 02 00 00 mov 0x240(%rbx),%rax [*]
c7 40 40 01 00 00 00 movl $0x1,0x40(%rax)With this patch applied, the instruction at [*] is elided, since the
store to plane->state->plane is known to not alter the value of
plane->state.[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Rasmus Villemoes
Cc: Christoph Lameter
Cc: Pekka Enberg
Cc: David Rientjes
Cc: Joonsoo Kim
Cc: Andi Kleen
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
16 Apr, 2015
1 commit
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All occurrences of mempools based on slab caches with object constructors
have been removed from the tree, so disallow creating them.We can only dereference mem->ctor in mm/mempool.c without including
mm/slab.h in include/linux/mempool.h. So simply note the restriction,
just like the comment restricting usage of __GFP_ZERO, and warn on kernels
with CONFIG_DEBUG_VM() if such a mempool is allocated from.We don't want to incur this check on every element allocation, so use
VM_BUG_ON().Signed-off-by: David Rientjes
Cc: Dave Kleikamp
Cc: Christoph Hellwig
Cc: Sebastian Ott
Cc: Mikulas Patocka
Cc: Catalin Marinas
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
15 Apr, 2015
1 commit
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Allocating a large number of elements in atomic context could quickly
deplete memory reserves, so just disallow atomic resizing entirely.Nothing currently uses mempool_resize() with anything other than
GFP_KERNEL, so convert existing callers to drop the gfp_mask.[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: David Rientjes
Acked-by: Steffen Maier [zfcp]
Cc: Martin Schwidefsky
Cc: Heiko Carstens
Cc: Steve French
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
25 Jun, 2012
1 commit
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mempool_create_node() currently assumes %GFP_KERNEL. Its only user,
blk_init_free_list(), is about to be updated to use other allocation
flags - add @gfp_mask argument to the function.Signed-off-by: Tejun Heo
Cc: Andrew Morton
Cc: Hugh Dickins
Signed-off-by: Jens Axboe
22 Sep, 2009
1 commit
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The kzalloc mempool zeros items when they are initially allocated, but
does not rezero used items that are returned to the pool. Consequently
mempool_alloc()s may return non-zeroed memory.Since there are/were only two in-tree users for
mempool_create_kzalloc_pool(), and 'fixing' this in a way that will
re-zero used (but not new) items before first use is non-trivial, just
remove it.Signed-off-by: Sage Weil
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
27 Mar, 2006
4 commits
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Create a simple wrapper function for the common case of creating a slab-based
mempool.Signed-off-by: Matthew Dobson
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Add another allocator to the common mempool code: a kzalloc/kfree allocator
This will be used by the next patch in the series to replace a mempool-backed
kzalloc allocator. It is also very likely that there will be more users in
the future.Signed-off-by: Matthew Dobson
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Add another allocator to the common mempool code: a kmalloc/kfree allocator
This will be used by the next patch in the series to replace duplicate
mempool-backed kmalloc allocators in several places in the kernel. It is also
very likely that there will be more users in the future.Signed-off-by: Matthew Dobson
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This will be used by the next patch in the series to replace duplicate
mempool-backed page allocators in 2 places in the kernel. It is also likely
that there will be more users in the future.Signed-off-by: Matthew Dobson
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
09 Oct, 2005
1 commit
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- added typedef unsigned int __nocast gfp_t;
- replaced __nocast uses for gfp flags with gfp_t - it gives exactly
the same warnings as far as sparse is concerned, doesn't change
generated code (from gcc point of view we replaced unsigned int with
typedef) and documents what's going on far better.Signed-off-by: Al Viro
Signed-off-by: Linus Torvalds
24 Jun, 2005
1 commit
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Patch to allocate the control structures for for ide devices on the node of
the device itself (for NUMA systems). The patch depends on the Slab API
change patch by Manfred and me (in mm) and the pcidev_to_node patch that I
posted today.Does some realignment too.
Signed-off-by: Justin M. Forbes
Signed-off-by: Christoph Lameter
Signed-off-by: Pravin Shelar
Signed-off-by: Shobhit Dayal
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
17 Apr, 2005
1 commit
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Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.Let it rip!
