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Message-Id: <20210217001322.2226796-8-shy828301@gmail.com> Date: Tue, 16 Feb 2021 16:13:16 -0800 From: Yang Shi <shy828301@...il.com> To: guro@...com, ktkhai@...tuozzo.com, vbabka@...e.cz, shakeelb@...gle.com, david@...morbit.com, hannes@...xchg.org, mhocko@...e.com, akpm@...ux-foundation.org Cc: shy828301@...il.com, linux-mm@...ck.org, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [v8 PATCH 07/13] 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. Acked-by: Roman Gushchin <guro@...com> Acked-by: Kirill Tkhai <ktkhai@...tuozzo.com> Acked-by: Vlastimil Babka <vbabka@...e.cz> Signed-off-by: Yang Shi <shy828301@...il.com> --- mm/vmscan.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index c94861a3ea3e..fe6e25f46b55 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -192,6 +192,13 @@ static inline int shrinker_map_size(int nr_items) return (DIV_ROUND_UP(nr_items, BITS_PER_LONG) * sizeof(unsigned long)); } +static struct shrinker_info *shrinker_info_protected(struct mem_cgroup *memcg, + int nid) +{ + return rcu_dereference_protected(memcg->nodeinfo[nid]->shrinker_info, + lockdep_is_held(&shrinker_rwsem)); +} + static int expand_one_shrinker_info(struct mem_cgroup *memcg, int size, int old_size) { @@ -199,8 +206,7 @@ static int expand_one_shrinker_info(struct mem_cgroup *memcg, int nid; for_each_node(nid) { - old = rcu_dereference_protected( - mem_cgroup_nodeinfo(memcg, nid)->shrinker_info, true); + old = shrinker_info_protected(memcg, nid); /* Not yet online memcg */ if (!old) return 0; @@ -231,7 +237,7 @@ void free_shrinker_info(struct mem_cgroup *memcg) for_each_node(nid) { pn = mem_cgroup_nodeinfo(memcg, nid); - info = rcu_dereference_protected(pn->shrinker_info, true); + info = shrinker_info_protected(memcg, nid); kvfree(info); rcu_assign_pointer(pn->shrinker_info, NULL); } @@ -673,8 +679,7 @@ static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid, if (!down_read_trylock(&shrinker_rwsem)) return 0; - info = rcu_dereference_protected(memcg->nodeinfo[nid]->shrinker_info, - true); + info = shrinker_info_protected(memcg, nid); if (unlikely(!info)) goto unlock; -- 2.26.2
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