mm: memcg: remove needless !mm fixup to init_mm when charging

It does not matter to __mem_cgroup_try_charge() if the passed mm is NULL
or init_mm, it will charge the root memcg in either case.

Also fix up the comment in __mem_cgroup_try_charge() that claimed the
init_mm would be charged when no mm was passed.  It's not really
incorrect, but confusing.  Clarify that the root memcg is charged in this
case.

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: David Rientjes <rientjes@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
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>

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 17a79e5..10b3703 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2333,7 +2333,7 @@ static int __mem_cgroup_try_charge(struct mm_struct *mm,
         * We always charge the cgroup the mm_struct belongs to.
         * The mm_struct's mem_cgroup changes on task migration if the
         * thread group leader migrates. It's possible that mm is not
-        * set, if so charge the init_mm (happens for pagecache usage).
+        * set, if so charge the root memcg (happens for pagecache usage).
         */
        if (!*ptr && !mm)
                *ptr = root_mem_cgroup;
@@ -2833,8 +2833,6 @@ int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
                ret = 0;
        return ret;
 charge_cur_mm:
-       if (unlikely(!mm))
-               mm = &init_mm;
        ret = __mem_cgroup_try_charge(mm, mask, 1, memcgp, true);
        if (ret == -EINTR)
                ret = 0;
@@ -2899,9 +2897,6 @@ int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
        if (PageCompound(page))
                return 0;
 
-       if (unlikely(!mm))
-               mm = &init_mm;
-
        if (!PageSwapCache(page))
                ret = mem_cgroup_charge_common(page, mm, gfp_mask, type);
        else { /* page is swapcache/shmem */