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authorAnisse Astier <anisse@astier.eu>2016-09-09 10:43:32 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-09-13 02:35:27 +0200
commit1ad1410f632d4141221634308a5e56f339f92009 (patch)
treeabe5eb613d5142ab3b8a6f273c1fd26efef8ffc2 /kernel/power/power.h
parentfa7fd6fa38e36d88bc9f2d0e45e5b9bd0387079f (diff)
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 'kernel/power/power.h')
-rw-r--r--kernel/power/power.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 242d8b827dd5..56d1d0dedf76 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -110,6 +110,8 @@ extern int create_basic_memory_bitmaps(void);
extern void free_basic_memory_bitmaps(void);
extern int hibernate_preallocate_memory(void);
+extern void clear_free_pages(void);
+
/**
* Auxiliary structure used for reading the snapshot image data and
* metadata from and writing them to the list of page backup entries