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authorVinayak Menon <vinmenon@codeaurora.org>2017-05-03 14:54:42 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-05-03 15:52:10 -0700
commitbd33ef3681359343863f2290aded182b0441edee (patch)
treee4575468fe495b08fe95c4aa8272895f843183b3 /mm/Kconfig.debug
parent2872bb2d0a4952ffb721e703555cb73d40b2c2f0 (diff)
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mm: enable page poisoning early at boot
On SPARSEMEM systems page poisoning is enabled after buddy is up, because of the dependency on page extension init. This causes the pages released by free_all_bootmem not to be poisoned. This either delays or misses the identification of some issues because the pages have to undergo another cycle of alloc-free-alloc for any corruption to be detected. Enable page poisoning early by getting rid of the PAGE_EXT_DEBUG_POISON flag. Since all the free pages will now be poisoned, the flag need not be verified before checking the poison during an alloc. [vinmenon@codeaurora.org: fix Kconfig] Link: http://lkml.kernel.org/r/1490878002-14423-1-git-send-email-vinmenon@codeaurora.org Link: http://lkml.kernel.org/r/1490358246-11001-1-git-send-email-vinmenon@codeaurora.org Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org> Acked-by: Laura Abbott <labbott@redhat.com> Tested-by: Laura Abbott <labbott@redhat.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/Kconfig.debug')
-rw-r--r--mm/Kconfig.debug1
1 files changed, 0 insertions, 1 deletions
diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug
index 79d0fd13b5b3..5b0adf1435de 100644
--- a/mm/Kconfig.debug
+++ b/mm/Kconfig.debug
@@ -42,7 +42,6 @@ config DEBUG_PAGEALLOC_ENABLE_DEFAULT
config PAGE_POISONING
bool "Poison pages after freeing"
- select PAGE_EXTENSION
select PAGE_POISONING_NO_SANITY if HIBERNATION
---help---
Fill the pages with poison patterns after free_pages() and verify