+ mm-kmem-remove-redundant-checks-from-get_obj_cgroup_from_current.patch added to -mm tree

+ mm-kmem-remove-redundant-checks-from-get_obj_cgroup_from_current.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm: kmem: remove redundant checks from get_obj_cgroup_from_current()
has been added to the -mm tree.  Its filename is
     mm-kmem-remove-redundant-checks-from-get_obj_cgroup_from_current.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/mm-kmem-remove-redundant-checks-from-get_obj_cgroup_from_current.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/mm-kmem-remove-redundant-checks-from-get_obj_cgroup_from_current.patch

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------------------------------------------------------
From: Roman Gushchin <guro@fb.com>
Subject: mm: kmem: remove redundant checks from get_obj_cgroup_from_current()

There are checks for current->mm and current->active_memcg in
get_obj_cgroup_from_current(), but these checks are redundant:
memcg_kmem_bypass() called just above performs same checks.

Link: http://lkml.kernel.org/r/20200827225843.1270629-3-guro@fb.com
Signed-off-by: Roman Gushchin <guro@fb.com>
Reviewed-by: Shakeel Butt <shakeelb@google.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 |    3 ---
 1 file changed, 3 deletions(-)

--- a/mm/memcontrol.c~mm-kmem-remove-redundant-checks-from-get_obj_cgroup_from_current
+++ a/mm/memcontrol.c
@@ -2919,9 +2919,6 @@ __always_inline struct obj_cgroup *get_o
 	if (memcg_kmem_bypass())
 		return NULL;
 
-	if (unlikely(!current->mm && !current->active_memcg))
-		return NULL;
-
 	rcu_read_lock();
 	if (unlikely(current->active_memcg))
 		memcg = rcu_dereference(current->active_memcg);
_

Patches currently in -mm which might be from guro@fb.com are

mm-rework-remote-memcg-charging-api-to-support-nesting.patch
mm-kmem-move-memcg_kmem_bypass-calls-to-get_mem-obj_cgroup_from_current.patch
mm-kmem-remove-redundant-checks-from-get_obj_cgroup_from_current.patch
mm-kmem-prepare-remote-memcg-charging-infra-for-interrupt-contexts.patch
mm-kmem-enable-kernel-memcg-accounting-from-interrupt-contexts.patch
mm-vmstat-fix-proc-sys-vm-stat_refresh-generating-false-warnings.patch
mm-vmstat-fix-proc-sys-vm-stat_refresh-generating-false-warnings-fix.patch