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| author | Ron Lee <ron@debian.org> | 2009-05-21 21:28:22 +0200 |
|---|---|---|
| committer | Pekka Enberg <penberg@cs.helsinki.fi> | 2009-05-22 10:01:12 +0200 |
| commit | 6746136520cd0827320a83e62d0a023a5a433650 (patch) | |
| tree | 2e57aef24fbb8e8531aad10061245ec4bddda6f9 /mm/truncate.c | |
| parent | Merge git://git.kernel.org/pub/scm/linux/kernel/git/czankel/xtensa-2.6 (diff) | |
| download | linux-6746136520cd0827320a83e62d0a023a5a433650.tar.xz linux-6746136520cd0827320a83e62d0a023a5a433650.zip | |
slab: fix generic PAGE_POISONING conflict with SLAB_RED_ZONE
A generic page poisoning mechanism was added with commit:
6a11f75b6a17b5d9ac5025f8d048382fd1f47377
which destructively poisons full pages with a bitpattern.
On arches where PAGE_POISONING is used, this conflicts with the slab
redzone checking enabled by DEBUG_SLAB, scribbling bits all over its
magic words and making it complain about that quite emphatically.
On x86 (and I presume at present all the other arches which set
ARCH_SUPPORTS_DEBUG_PAGEALLOC too), the kernel_map_pages() operation
is non destructive so it can coexist with the other DEBUG_SLAB
mechanisms just fine.
This patch favours the expensive full page destruction test for
cases where there is a collision and it is explicitly selected.
Signed-off-by: Ron Lee <ron@debian.org>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Diffstat (limited to 'mm/truncate.c')
0 files changed, 0 insertions, 0 deletions