From: Zlatko Calusic <zlatko.calu...@iskon.hr>
The unintended consequence of commit 4ae0a48b is that
wait_iff_congested() can now be called with NULL struct zone*
producing kernel oops like this:
BUG: unable to handle kernel NULL pointer dereference
IP: [<ffffffff811542d9>] wait_iff_congested+0x59/0x140
This trivial patch fixes it.
Reported-by: Zhouping Liu <z...@redhat.com>
Reported-and-tested-by: Sedat Dilek <sedat.di...@gmail.com>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Mel Gorman <mgor...@suse.de>
Cc: Hugh Dickins <hu...@google.com>
Signed-off-by: Zlatko Calusic <zlatko.calu...@iskon.hr>
---
mm/vmscan.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 02bcfa3..e55ce55 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2782,7 +2782,7 @@ loop_again:
if (total_scanned && (sc.priority < DEF_PRIORITY - 2)) {
if (has_under_min_watermark_zone)
count_vm_event(KSWAPD_SKIP_CONGESTION_WAIT);
- else
+ else if (unbalanced_zone)
wait_iff_congested(unbalanced_zone,
BLK_RW_ASYNC, HZ/10);
}
--
1.8.1.rc3
--
Zlatko
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