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authorWu Fengguang <fengguang.wu@intel.com>2009-12-16 12:19:58 +0100
committerAndi Kleen <ak@linux.intel.com>2009-12-16 12:19:58 +0100
commit8d22ba1b74aa9420b6032d856446564fb21f8090 (patch)
tree6c2e2d27e81d784faa0481500f1cecc613ff1167 /mm/memory-failure.c
parent95d01fc664b9476e0d18e3d745bb209a42a33588 (diff)
downloadlwn-8d22ba1b74aa9420b6032d856446564fb21f8090.tar.gz
lwn-8d22ba1b74aa9420b6032d856446564fb21f8090.zip
HWPOISON: detect free buddy pages explicitly
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>
Diffstat (limited to 'mm/memory-failure.c')
-rw-r--r--mm/memory-failure.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 676ab394200e..5055b940df5f 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -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;
+ }
}
/*