mm: vmscan: add shrinker_info_protected() helper

The shrinker_info is dereferenced in a couple of places via
rcu_dereference_protected with different calling conventions, for
example, using mem_cgroup_nodeinfo helper or dereferencing
memcg->nodeinfo[nid]->shrinker_info.  And the later patch will add more
dereference places.

So extract the dereference into a helper to make the code more readable.
No functional change.

[[email protected]: retain rcu_dereference_protected() in free_shrinker_info(), per Hugh]

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Yang Shi <[email protected]>
Acked-by: Roman Gushchin <[email protected]>
Acked-by: Kirill Tkhai <[email protected]>
Acked-by: Vlastimil Babka <[email protected]>
Reviewed-by: Shakeel Butt <[email protected]>
Cc: Dave Chinner <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Michal Hocko <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions