diff options
| author | Akinobu Mita <akinobu.mita@gmail.com> | 2009-03-31 18:23:17 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-01 11:59:13 -0400 |
| commit | 6a11f75b6a17b5d9ac5025f8d048382fd1f47377 (patch) | |
| tree | a3415cd897823975b927f89a233d2703bf97ba2b /arch/x86/Kconfig.debug | |
| parent | 610a77e04a8d9fe8764dc484e2182fa251ce1cc2 (diff) | |
generic debug pagealloc
CONFIG_DEBUG_PAGEALLOC is now supported by x86, powerpc, sparc64, and
s390. This patch implements it for the rest of the architectures by
filling the pages with poison byte patterns after free_pages() and
verifying the poison patterns before alloc_pages().
This generic one cannot detect invalid page accesses immediately but
invalid read access may cause invalid dereference by poisoned memory and
invalid write access can be detected after a long delay.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86/Kconfig.debug')
| -rw-r--r-- | arch/x86/Kconfig.debug | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug index fdb45df608b6..a345cb5447a8 100644 --- a/arch/x86/Kconfig.debug +++ b/arch/x86/Kconfig.debug | |||
| @@ -75,6 +75,7 @@ config DEBUG_STACK_USAGE | |||
| 75 | config DEBUG_PAGEALLOC | 75 | config DEBUG_PAGEALLOC |
| 76 | bool "Debug page memory allocations" | 76 | bool "Debug page memory allocations" |
| 77 | depends on DEBUG_KERNEL | 77 | depends on DEBUG_KERNEL |
| 78 | depends on ARCH_SUPPORTS_DEBUG_PAGEALLOC | ||
| 78 | ---help--- | 79 | ---help--- |
| 79 | Unmap pages from the kernel linear mapping after free_pages(). | 80 | Unmap pages from the kernel linear mapping after free_pages(). |
| 80 | This results in a large slowdown, but helps to find certain types | 81 | This results in a large slowdown, but helps to find certain types |