linux-kernel - [PATCH] memcg, kmem: mark cancel

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Date:   Fri, 22 Oct 2021 09:05:35 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Muchun Song <songmuchun@...edance.com>,
        Roman Gushchin <guro@...com>
Cc:     Arnd Bergmann <arnd@...db.de>, Shakeel Butt <shakeelb@...gle.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Waiman Long <longman@...hat.com>, cgroups@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] memcg, kmem: mark cancel_charge() inline

From: Arnd Bergmann <arnd@...db.de>

cancel_charge() is no longer called for CONFIG_MEMCG_KMEM on NOMMU
targets, which causes a compiletime warning:

mm/memcontrol.c:2774:13: error: unused function 'cancel_charge' [-Werror,-Wunused-function]

Remove the now-incorrect #ifdef and just mark the function
'inline' like the other related helpers. This is simpler
and means we no longer have to match the #ifdef with the
caller.

Fixes: 5f3345c17079 ("memcg, kmem: further deprecate kmem.limit_in_bytes")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
The 5f3345c17079 commit is in -mm, so the commit ID is not
stable. Feel free to just fold this into the other patch, or
take out that reference
---
 mm/memcontrol.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 6538595994d2..9edccfeac804 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2770,8 +2770,7 @@ static inline int try_charge(struct mem_cgroup *memcg, gfp_t gfp_mask,
 	return try_charge_memcg(memcg, gfp_mask, nr_pages);
 }
 
-#if defined(CONFIG_MEMCG_KMEM) || defined(CONFIG_MMU)
-static void cancel_charge(struct mem_cgroup *memcg, unsigned int nr_pages)
+static inline void cancel_charge(struct mem_cgroup *memcg, unsigned int nr_pages)
 {
 	if (mem_cgroup_is_root(memcg))
 		return;
@@ -2780,7 +2779,6 @@ static void cancel_charge(struct mem_cgroup *memcg, unsigned int nr_pages)
 	if (do_memsw_account())
 		page_counter_uncharge(&memcg->memsw, nr_pages);
 }
-#endif
 
 static void commit_charge(struct folio *folio, struct mem_cgroup *memcg)
 {
-- 
2.29.2