linux-kernel - [PATCH] mm: Make mem_cgroup_id_get_many dependent on MMU and MEMCG

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Message-Id: <20200304142348.48167-1-vincenzo.frascino@arm.com>
Date:   Wed,  4 Mar 2020 14:23:48 +0000
From:   Vincenzo Frascino <vincenzo.frascino@....com>
To:     cgroups@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     Vincenzo Frascino <vincenzo.frascino@....com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] mm: Make mem_cgroup_id_get_many dependent on MMU and MEMCG_SWAP

mem_cgroup_id_get_many() is currently used only when MMU or MEMCG_SWAP
configuration options are enabled. Having them disabled triggers the
following warning at compile time:

linux/mm/memcontrol.c:4797:13: warning: ‘mem_cgroup_id_get_many’ defined
but not used [-Wunused-function]
 static void mem_cgroup_id_get_many(struct mem_cgroup *memcg, unsigned
 int n)

Make mem_cgroup_id_get_many() dependent on MMU and MEMCG_SWAP to address
the issue.

Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Michal Hocko <mhocko@...nel.org>
Cc: Vladimir Davydov <vdavydov.dev@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>
---
 mm/memcontrol.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index d09776cd6e10..628cebeb4bdd 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4794,10 +4794,12 @@ static void mem_cgroup_id_remove(struct mem_cgroup *memcg)
 	}
 }
 
+#if defined(CONFIG_MEMCG_SWAP) || defined(CONFIG_MMU)
 static void mem_cgroup_id_get_many(struct mem_cgroup *memcg, unsigned int n)
 {
 	refcount_add(n, &memcg->id.ref);
 }
+#endif
 
 static void mem_cgroup_id_put_many(struct mem_cgroup *memcg, unsigned int n)
 {
-- 
2.25.1