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| author | Anisse Astier <anisse@astier.eu> | 2016-09-09 10:43:32 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-09-13 02:35:27 +0200 |
| commit | 1ad1410f632d4141221634308a5e56f339f92009 (patch) | |
| tree | abe5eb613d5142ab3b8a6f273c1fd26efef8ffc2 /mm | |
| parent | fa7fd6fa38e36d88bc9f2d0e45e5b9bd0387079f (diff) | |
| download | op-kernel-dev-1ad1410f632d4141221634308a5e56f339f92009.zip op-kernel-dev-1ad1410f632d4141221634308a5e56f339f92009.tar.gz | |
PM / Hibernate: allow hibernation with PAGE_POISONING_ZERO
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 <anisse@astier.eu>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/Kconfig.debug | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug index 22f4cd9..afcc550 100644 --- a/mm/Kconfig.debug +++ b/mm/Kconfig.debug @@ -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 |
