The patch titled
memcg: remove NULL check from lookup_page_cgroup() result
has been removed from the -mm tree. Its filename was
memcg-remove-null-check-from-lookup_page_cgroup-result.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: memcg: remove NULL check from lookup_page_cgroup() result
From: Johannes Weiner <hannes@xxxxxxxxxxx>
The page_cgroup array is set up before even fork is initialized. I
seriously doubt that this code executes before the array is alloc'd.
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Daisuke Nishimura <nishimura@xxxxxxxxxxxxxxxxx>
Cc: Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx>
Cc: Minchan Kim <minchan.kim@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff -puN mm/memcontrol.c~memcg-remove-null-check-from-lookup_page_cgroup-result mm/memcontrol.c
--- a/mm/memcontrol.c~memcg-remove-null-check-from-lookup_page_cgroup-result
+++ a/mm/memcontrol.c
@@ -2369,10 +2369,7 @@ static int mem_cgroup_charge_common(stru
}
pc = lookup_page_cgroup(page);
- /* can happen at boot */
- if (unlikely(!pc))
- return 0;
- prefetchw(pc);
+ BUG_ON(!pc); /* XXX: remove this and move pc lookup into commit */
ret = __mem_cgroup_try_charge(mm, gfp_mask, &mem, oom, page_size);
if (ret || !mem)
_
Patches currently in -mm which might be from hannes@xxxxxxxxxxx are
origin.patch
mm-add-vm-counters-for-transparent-hugepages.patch
mm-batch-activate_page-to-reduce-lock-contention.patch
memcg-document-cgroup-dirty-memory-interfaces.patch
memcg-add-page_cgroup-flags-for-dirty-page-tracking.patch
memcg-add-dirty-page-accounting-infrastructure.patch
memcg-add-kernel-calls-for-memcg-dirty-page-stats.patch
memcg-add-dirty-limits-to-mem_cgroup.patch
memcg-add-cgroupfs-interface-to-memcg-dirty-limits.patch
memcg-add-dirty-limiting-routines.patch
memcg-check-memcg-dirty-limits-in-page-writeback.patch
memcg-make-background-writeback-memcg-aware.patch
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