linux-kernel - [PATCH] mm/slub: quiet the clang warning with -Wunused-function enabled

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Message-Id: <20240710025418.394321-1-sxwjean@me.com>
Date: Wed, 10 Jul 2024 10:54:18 +0800
From: sxwjean@...com
To: vbabka@...e.cz,
	surenb@...gle.com
Cc: cl@...ux.co,
	penberg@...nel.org,
	rientjes@...gle.com,
	iamjoonsoo.kim@....com,
	akpm@...ux-foundation.org,
	roman.gushchin@...ux.dev,
	42.hyeyoo@...il.com,
	xiongwei.song@...ux.dev,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	kernel test robot <lkp@...el.com>
Subject: [PATCH] mm/slub: quiet the clang warning with -Wunused-function enabled

From: Xiongwei Song <xiongwei.song@...ux.dev>

The only user of prepare_slab_obj_exts_hook() is
alloc_tagging_slab_alloc_hook(), which can build with
CONFIG_MEM_ALLOC_PROFILING enabled. So, the warning was triggerred
when disabling CONFIG_MEM_ALLOC_PROFILING. Let's add "__maybe_unused"
for prepare_slab_obj_exts_hook().

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202407050845.zNONqauD-lkp@intel.com/
Signed-off-by: Xiongwei Song <xiongwei.song@...ux.dev>
---
 mm/slub.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index ce39544acf7c..2e26f20759c0 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2027,7 +2027,7 @@ static inline bool need_slab_obj_ext(void)
 	return false;
 }
 
-static inline struct slabobj_ext *
+static inline struct slabobj_ext * __maybe_unused
 prepare_slab_obj_exts_hook(struct kmem_cache *s, gfp_t flags, void *p)
 {
 	struct slab *slab;
@@ -2068,7 +2068,7 @@ static inline bool need_slab_obj_ext(void)
 	return false;
 }
 
-static inline struct slabobj_ext *
+static inline struct slabobj_ext * __maybe_unused
 prepare_slab_obj_exts_hook(struct kmem_cache *s, gfp_t flags, void *p)
 {
 	return NULL;
-- 
2.34.1