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 Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Lukas Bulwahn <lukas.bulwahn@xxxxxxxxx> 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@xxxxxxxxx Signed-off-by: Lukas Bulwahn <lukas.bulwahn@xxxxxxxxx> Cc: Roman Gushchin <guro@xxxxxx> Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- 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@xxxxxxxxx are mm-memcg-remove-obsolete-memcg_has_children.patch mm-vmscan-drop-unneeded-assignment-in-kswapd.patch