linux-kernel - Re: [PATCH 1/1] mm, slab: move prepare_slab_obj_exts_hook under CONFIG_MEM_ALLOC

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Message-ID: <f7623c47f2ddb4ece4dc56276e214b754372cf65@linux.dev>
Date: Fri, 12 Jul 2024 03:51:20 +0000
From: xiongwei.song@...ux.dev
To: "Suren Baghdasaryan" <surenb@...gle.com>, akpm@...ux-foundation.org
Cc: vbabka@...e.cz, sxwjean@...com, willy@...radead.org, nathan@...nel.org,
 cl@...ux.com, penberg@...nel.org, rientjes@...gle.com,
 iamjoonsoo.kim@....com, roman.gushchin@...ux.dev, 42.hyeyoo@...il.com,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org, "Suren Baghdasaryan"
 <surenb@...gle.com>, "kernel test robot" <lkp@...el.com>
Subject: Re: [PATCH 1/1] mm, slab: move prepare_slab_obj_exts_hook under
 CONFIG_MEM_ALLOC_PROFILING

July 12, 2024 at 1:02 AM, "Suren Baghdasaryan" <surenb@...gle.com> wrote:



> 
> The only place prepare_slab_obj_exts_hook() is currently being used is
> 
> from alloc_tagging_slab_alloc_hook() when CONFIG_MEM_ALLOC_PROFILING=y.
> 
> Move its definition under CONFIG_MEM_ALLOC_PROFILING to prevent unused
> 
> function warning for CONFIG_SLAB_OBJ_EXT=n case.
> 
> Reported-by: kernel test robot <lkp@...el.com>
> 
> Closes: https://lore.kernel.org/oe-kbuild-all/202407050845.zNONqauD-lkp@intel.com/
> 
> Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
> 
> Cc: Vlastimil Babka <vbabka@...e.cz>

Reviewed-by: Xiongwei Song <xiongwei.song@...ux.dev>

Thanks.

> 
> ---
> 
> Applied over slab/for-next because of the refactoring [1] in that branch.
> 
> [1] 302a3ea38aec ("mm, slab: move allocation tagging code in the alloc path into a hook")
> 
>  mm/slub.c | 48 +++++++++++++++++++++---------------------------
> 
>  1 file changed, 21 insertions(+), 27 deletions(-)
> 
> diff --git a/mm/slub.c b/mm/slub.c
> 
> index ce39544acf7c..829a1f08e8a2 100644
> 
> --- a/mm/slub.c
> 
> +++ b/mm/slub.c
> 
> @@ -2027,6 +2027,27 @@ static inline bool need_slab_obj_ext(void)
> 
>  return false;
> 
>  }
> 
>  
> 
> +#else /* CONFIG_SLAB_OBJ_EXT */
> 
> +
> 
> +static int alloc_slab_obj_exts(struct slab *slab, struct kmem_cache *s,
> 
> + gfp_t gfp, bool new_slab)
> 
> +{
> 
> + return 0;
> 
> +}
> 
> +
> 
> +static inline void free_slab_obj_exts(struct slab *slab)
> 
> +{
> 
> +}
> 
> +
> 
> +static inline bool need_slab_obj_ext(void)
> 
> +{
> 
> + return false;
> 
> +}
> 
> +
> 
> +#endif /* CONFIG_SLAB_OBJ_EXT */
> 
> +
> 
> +#ifdef CONFIG_MEM_ALLOC_PROFILING
> 
> +
> 
>  static inline struct slabobj_ext *
> 
>  prepare_slab_obj_exts_hook(struct kmem_cache *s, gfp_t flags, void *p)
> 
>  {
> 
> @@ -2051,33 +2072,6 @@ prepare_slab_obj_exts_hook(struct kmem_cache *s, gfp_t flags, void *p)
> 
>  return slab_obj_exts(slab) + obj_to_index(s, slab, p);
> 
>  }
> 
>  
> 
> -#else /* CONFIG_SLAB_OBJ_EXT */
> 
> -
> 
> -static int alloc_slab_obj_exts(struct slab *slab, struct kmem_cache *s,
> 
> - gfp_t gfp, bool new_slab)
> 
> -{
> 
> - return 0;
> 
> -}
> 
> -
> 
> -static inline void free_slab_obj_exts(struct slab *slab)
> 
> -{
> 
> -}
> 
> -
> 
> -static inline bool need_slab_obj_ext(void)
> 
> -{
> 
> - return false;
> 
> -}
> 
> -
> 
> -static inline struct slabobj_ext *
> 
> -prepare_slab_obj_exts_hook(struct kmem_cache *s, gfp_t flags, void *p)
> 
> -{
> 
> - return NULL;
> 
> -}
> 
> -
> 
> -#endif /* CONFIG_SLAB_OBJ_EXT */
> 
> -
> 
> -#ifdef CONFIG_MEM_ALLOC_PROFILING
> 
> -
> 
>  static inline void
> 
>  alloc_tagging_slab_alloc_hook(struct kmem_cache *s, void *object, gfp_t flags)
> 
>  {
> 
> base-commit: fe4e761669ab4d8b388fdb6e9dbe9a110eed8009
> 
> -- 
> 
> 2.45.2.993.g49e7a77208-goog
>