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PM / Hibernate: allow hibernation with PAGE_POISONING_ZERO

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PAGE_POISONING_ZERO disables zeroing new pages on alloc, they are
poisoned (zeroed) as they become available.
In the hibernate use case, free pages will appear in the system without
being cleared, left there by the loading kernel.

This patch will make sure free pages are cleared on resume when
PAGE_POISONING_ZERO is enabled. We free the pages just after resume
because we can't do it later: going through any device resume code might
allocate some memory and invalidate the free pages bitmap.

Thus we don't need to disable hibernation when PAGE_POISONING_ZERO is
enabled.

Signed-off-by: Anisse Astier <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Acked-by: Pavel Machek <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Anisse Astier 2016-09-09 10:43:32 +02:00 • committed by Rafael J. Wysocki
commit 1ad1410f63
4 changed files with 27 additions and 20 deletions
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mm/Kconfig.debug
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@ -76,8 +76,6 @@ config PAGE_POISONING_ZERO
no longer necessary to write zeros when GFP_ZERO is used on
allocation.
Enabling page poisoning with this option will disable hibernation
If unsure, say N
bool