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authorJohannes Weiner <hannes@cmpxchg.org>2012-07-31 16:45:28 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-07-31 18:42:48 -0700
commit5d84c7766e8aacc6e3477bdf02fdb417163cf89b (patch)
treec0cfc049f0b47713f30e36a56f6dd85b9f4363a5 /mm/swapfile.c
parent0030f535a5cf9b1841d2088c10a0b2f8f2987460 (diff)
downloadlinux-5d84c7766e8aacc6e3477bdf02fdb417163cf89b.tar.gz
mm: swapfile: clean up unuse_pte race handling
The conditional mem_cgroup_cancel_charge_swapin() is a leftover from when the function would continue to reestablish the page even after mem_cgroup_try_charge_swapin() failed. After 85d9fc8 "memcg: fix refcnt handling at swapoff", the condition is always true when this code is reached. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Michal Hocko <mhocko@suse.cz> Cc: Hugh Dickins <hughd@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Cc: Wanpeng Li <liwp.linux@gmail.com> Cc: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/swapfile.c')
-rw-r--r--mm/swapfile.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 63958d60ecb..14e254c768f 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -835,8 +835,7 @@ static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd,
pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
if (unlikely(!pte_same(*pte, swp_entry_to_pte(entry)))) {
- if (ret > 0)
- mem_cgroup_cancel_charge_swapin(memcg);
+ mem_cgroup_cancel_charge_swapin(memcg);
ret = 0;
goto out;
}