From: Ron Lee Date: Thu, 21 May 2009 19:28:22 +0000 (+0930) Subject: slab: fix generic PAGE_POISONING conflict with SLAB_RED_ZONE X-Git-Tag: v2.6.31-rc1~290^2~1^3 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6746136520cd0827320a83e62d0a023a5a433650;p=pandora-kernel.git 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 Signed-off-by: Pekka Enberg --- Reading git-diff-tree failed