+ mm-memcg-remove-obsolete-memcg_has_children.patch added to -mm tree

+ mm-memcg-remove-obsolete-memcg_has_children.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm: memcg: remove obsolete memcg_has_children()
has been added to the -mm tree.  Its filename is
     mm-memcg-remove-obsolete-memcg_has_children.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-memcg-remove-obsolete-memcg_has_children.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-memcg-remove-obsolete-memcg_has_children.patch

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------------------------------------------------------
From: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Subject: mm: memcg: remove obsolete memcg_has_children()

Commit 2ef1bf118c40 ("mm: memcg: deprecate the non-hierarchical mode")
removed the only use of memcg_has_children() in
mem_cgroup_hierarchy_write() as part of the feature deprecation.

Hence, since then, make CC=clang W=1 warns:

  mm/memcontrol.c:3421:20:
    warning: unused function 'memcg_has_children' [-Wunused-function]

Simply remove this obsolete unused function.

Link: https://lkml.kernel.org/r/20201116055043.20886-1-lukas.bulwahn@gmail.com
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Cc: Roman Gushchin <guro@fb.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memcontrol.c |   13 -------------
 1 file changed, 13 deletions(-)

--- a/mm/memcontrol.c~mm-memcg-remove-obsolete-memcg_has_children
+++ a/mm/memcontrol.c
@@ -3454,19 +3454,6 @@ unsigned long mem_cgroup_soft_limit_recl
 }
 
 /*
- * Test whether @memcg has children, dead or alive.
- */
-static inline bool memcg_has_children(struct mem_cgroup *memcg)
-{
-	bool ret;
-
-	rcu_read_lock();
-	ret = css_next_child(NULL, &memcg->css);
-	rcu_read_unlock();
-	return ret;
-}
-
-/*
  * Reclaims as many pages from the given memcg as possible.
  *
  * Caller is responsible for holding css reference for memcg.
_

Patches currently in -mm which might be from lukas.bulwahn@gmail.com are

mm-memcg-remove-obsolete-memcg_has_children.patch
mm-vmscan-drop-unneeded-assignment-in-kswapd.patch