mm/memcg: remove incorrect comment

Swapcache readahead pages are charged before being used, so it is unlikely
that they will be migrated before charging.  Remove the incorrect comment.

Link: https://lkml.kernel.org/r/1605864930-49405-1-git-send-email-alex.shi@linux.alibaba.com
Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 13e3869..0083b69 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -6903,7 +6903,6 @@ void mem_cgroup_migrate(struct page *oldpage, struct page *newpage)
        if (newpage->mem_cgroup)
                return;
 
-       /* Swapcache readahead pages can get replaced before being charged */
        memcg = oldpage->mem_cgroup;
        if (!memcg)
                return;