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>

1 files changed, 1 insertions, 2 deletions

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 63958d60ecb0..14e254c768fc 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;
         }