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HWPOISON: detect free buddy pages explicitly

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Most free pages in the buddy system have no PG_buddy set.
Introduce is_free_buddy_page() for detecting them reliably.

CC: Nick Piggin <npiggin@suse.de>
CC: Mel Gorman <mel@linux.vnet.ibm.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
This commit is contained in:
Wu Fengguang
2009-12-16 12:19:58 +01:00
committed by Andi Kleen
parent 95d01fc664
commit 8d22ba1b74
3 changed files with 31 additions and 2 deletions
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9
mm/memory-failure.c
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@@ -807,8 +807,13 @@ int __memory_failure(unsigned long pfn, int trapno, int flags)
*/
if (!(flags & MF_COUNT_INCREASED) &&
!get_page_unless_zero(compound_head(p))) {
action_result(pfn, "free or high order kernel", IGNORED);
return PageBuddy(compound_head(p)) ? 0 : -EBUSY;
if (is_free_buddy_page(p)) {
action_result(pfn, "free buddy", DELAYED);
return 0;
} else {
action_result(pfn, "high order kernel", IGNORED);
return -EBUSY;
}
}
/*