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Groups > linux.kernel > #1480246
| From | Kees Cook <keescook@chromium.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH] PM / Hibernate: allow hibernation with PAGE_POISONING_ZERO |
| Date | 2016-09-09 20:30 +0200 |
| Message-ID | <sfyIO-6qh-17@gated-at.bofh.it> (permalink) |
| References | <sfpFv-zV-7@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Fri, Sep 9, 2016 at 1:43 AM, Anisse Astier <anisse@astier.eu> wrote: > 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> > Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> > Cc: Laura Abbott <labbott@fedoraproject.org> > Cc: Mel Gorman <mgorman@suse.de> > Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Cool! Reviewed-by: Kees Cook <keescook@chromium.org> -Kees -- Kees Cook Nexus Security
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[PATCH] PM / Hibernate: allow hibernation with PAGE_POISONING_ZERO Anisse Astier <anisse@astier.eu> - 2016-09-09 10:50 +0200
Re: [PATCH] PM / Hibernate: allow hibernation with PAGE_POISONING_ZERO Kees Cook <keescook@chromium.org> - 2016-09-09 20:30 +0200
Re: [PATCH] PM / Hibernate: allow hibernation with PAGE_POISONING_ZERO Pavel Machek <pavel@ucw.cz> - 2016-09-12 13:40 +0200
Re: [PATCH] PM / Hibernate: allow hibernation with PAGE_POISONING_ZERO Pavel Machek <pavel@ucw.cz> - 2016-09-12 19:50 +0200
Re: [PATCH] PM / Hibernate: allow hibernation with PAGE_POISONING_ZERO "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-09-14 03:00 +0200
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