[PATCH 2/2 -mmotm] debug-pagealloc: cannot depend on hibernation

Akinobu Mita
2009-03-10T14:39:27Z

The generic debug-pagealloc generates wrong messages for the page corruption
after hibernation. Because the free pages are not saved to the suspend image.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: <linux-arch@vger.kernel.org>
---
mm/Kconfig.debug | 5 +++++
1 file changed, 5 insertions(+)

Index: 2.6-mmotm/mm/Kconfig.debug
===================================================================
--- 2.6-mmotm.orig/mm/Kconfig.debug
+++ 2.6-mmotm/mm/Kconfig.debug
@@ -4,9 +4,14 @@ config WANT_PAGE_DEBUG_FLAGS
config PAGE_POISONING
bool "Debug page memory allocations"
depends on DEBUG_KERNEL && !ARCH_SUPPORTS_DEBUG_PAGEALLOC
+ depends on !HIBERNATION
select DEBUG_PAGEALLOC
select WANT_PAGE_DEBUG_FLAGS
help
Fill the pages with poison patterns after free_pages() and verify
the patterns before alloc_pages(). This results in a large slowdown,
but helps to find certain types of memory corruptions.
+
+ This option cannot enalbe with hibernation. Otherwise, it will get
+ wrong messages for memory corruption because the free pages are not
+ saved to the suspend image.