HWPOISON: Use new shake_page in memory_failure

shake_page handles more types of page caches than
the much simpler lru_add_drain_all:

- slab (quite inefficiently for now)
- any other caches with a shrinker callback
- per cpu page allocator pages
- per CPU LRU

Use this call to try to turn pages into free or LRU pages.
Then handle the case of the page becoming free after drain everything.

Signed-off-by: Andi Kleen <ak@linux.intel.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 2d5f1223bf4d..ded1d387b4c5 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -936,8 +936,15 @@ int __memory_failure(unsigned long pfn, int trapno, int flags)
          * walked by the page reclaim code, however that's not a big loss.
          */
         if (!PageLRU(p))
-                lru_add_drain_all();
+                shake_page(p);
         if (!PageLRU(p)) {
+                /*
+                 * shake_page could have turned it free.
+                 */
+                if (is_free_buddy_page(p)) {
+                        action_result(pfn, "free buddy, 2nd try", DELAYED);
+                        return 0;
+                }
                 action_result(pfn, "non LRU", IGNORED);
                 put_page(p);
                 return -EBUSY;