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[067/200] mm: memcg: remove obsolete memcg_has_children()

Message ID 20201215030701.qGriOT4tw%akpm@linux-foundation.org (mailing list archive)
State New, archived
Headers show
Series [001/200] kthread: add kthread_work tracepoints | expand

Commit Message

Andrew Morton Dec. 15, 2020, 3:07 a.m. UTC
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:

    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>
Acked-by: Roman Gushchin <guro@fb.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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