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| author | Akinobu Mita <akinobu.mita@gmail.com> | 2009-04-01 00:23:17 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-01 17:59:13 +0200 |
| commit | 6a11f75b6a17b5d9ac5025f8d048382fd1f47377 (patch) | |
| tree | a3415cd897823975b927f89a233d2703bf97ba2b /arch/powerpc | |
| parent | memdup_user(): introduce (diff) | |
| download | linux-6a11f75b6a17b5d9ac5025f8d048382fd1f47377.tar.xz linux-6a11f75b6a17b5d9ac5025f8d048382fd1f47377.zip | |
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/powerpc')
| -rw-r--r-- | arch/powerpc/Kconfig | 3 | ||||
| -rw-r--r-- | arch/powerpc/Kconfig.debug | 1 |
2 files changed, 4 insertions, 0 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index ad6b1c084fe3..45192dce65c4 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -228,6 +228,9 @@ config PPC_OF_PLATFORM_PCI depends on PPC64 # not supported on 32 bits yet default n +config ARCH_SUPPORTS_DEBUG_PAGEALLOC + def_bool y + source "init/Kconfig" source "kernel/Kconfig.freezer" diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug index 22091bbfdc9b..6aa0b5e087cd 100644 --- a/arch/powerpc/Kconfig.debug +++ b/arch/powerpc/Kconfig.debug @@ -30,6 +30,7 @@ config DEBUG_STACK_USAGE config DEBUG_PAGEALLOC bool "Debug page memory allocations" depends on DEBUG_KERNEL && !HIBERNATION + depends on ARCH_SUPPORTS_DEBUG_PAGEALLOC help Unmap pages from the kernel linear mapping after free_pages(). This results in a large slowdown, but helps to find certain types |