diff options
| author | Wu Fengguang <fengguang.wu@intel.com> | 2009-12-16 12:19:58 +0100 |
|---|---|---|
| committer | Andi Kleen <ak@linux.intel.com> | 2009-12-16 12:19:58 +0100 |
| commit | 8d22ba1b74aa9420b6032d856446564fb21f8090 (patch) | |
| tree | 6c2e2d27e81d784faa0481500f1cecc613ff1167 /mm/memory-failure.c | |
| parent | 95d01fc664b9476e0d18e3d745bb209a42a33588 (diff) | |
| download | lwn-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.c | 9 |
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; + } } /* |