The patch titled
memcg: remove NULL check from lookup_page_cgroup() result
has been added to the -mm tree. Its filename is
memcg-remove-null-check-from-lookup_page_cgroup-result.patch
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------------------------------------------------------
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>
Cc: 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
@@ -2343,10 +2343,7 @@ 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
epoll-fix-compiler-warning-and-optimize-the-non-blocking-path-fix.patch
memcg-res_counter_read_u64-fix-potential-races-on-32-bit-machines.patch
memcg-fix-ugly-initialization-of-return-value-is-in-caller.patch
memcg-soft-limit-reclaim-should-end-at-limit-not-below.patch
memcg-simplify-the-way-memory-limits-are-checked.patch
memcg-remove-unused-page-flag-bitfield-defines.patch
memcg-remove-impossible-conditional-when-committing.patch
memcg-remove-null-check-from-lookup_page_cgroup-result.patch
crash_dump-export-is_kdump_kernel-to-modules-consolidate-elfcorehdr_addr-setup_elfcorehdr-and-saved_max_pfn.patch
crash_dump-export-is_kdump_kernel-to-modules-consolidate-elfcorehdr_addr-setup_elfcorehdr-and-saved_max_pfn-fix.patch
crash_dump-export-is_kdump_kernel-to-modules-consolidate-elfcorehdr_addr-setup_elfcorehdr-and-saved_max_pfn-fix-fix.patch
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