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mm: enable page poisoning early at boot

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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.

[[email protected]: fix Kconfig]
  Link: http://lkml.kernel.org/r/[email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Vinayak Menon <[email protected]>
Acked-by: Laura Abbott <[email protected]>
Tested-by: Laura Abbott <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Akinobu Mita <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Vinayak Menon 2017-05-03 14:54:42 -07:00 • committed by Linus Torvalds
commit bd33ef3681
5 changed files with 17 additions and 88 deletions
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1
mm/Kconfig.debug
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@ -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