linux-kernel - Re: [PATCH 1/3] mm/slub: Only define kmalloc_large_node

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Date:   Mon, 22 May 2017 13:39:26 -0700 (PDT)
From:   David Rientjes <rientjes@...gle.com>
To:     Matthias Kaehlcke <mka@...omium.org>
cc:     Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] mm/slub: Only define kmalloc_large_node_hook() for
 NUMA systems

On Fri, 19 May 2017, Matthias Kaehlcke wrote:

> The function is only used when CONFIG_NUMA=y. Placing it in an #ifdef
> block fixes the following warning when building with clang:
> 
> mm/slub.c:1246:20: error: unused function 'kmalloc_large_node_hook'
>     [-Werror,-Wunused-function]
> 

Is clang not inlining kmalloc_large_node_hook() for some reason?  I don't 
think this should ever warn on gcc.

> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>

Acked-by: David Rientjes <rientjes@...gle.com>

> ---
>  mm/slub.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/mm/slub.c b/mm/slub.c
> index 57e5156f02be..66e1046435b7 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -1313,11 +1313,14 @@ static inline void dec_slabs_node(struct kmem_cache *s, int node,
>   * Hooks for other subsystems that check memory allocations. In a typical
>   * production configuration these hooks all should produce no code at all.
>   */
> +
> +#ifdef CONFIG_NUMA
>  static inline void kmalloc_large_node_hook(void *ptr, size_t size, gfp_t flags)
>  {
>  	kmemleak_alloc(ptr, size, 1, flags);
>  	kasan_kmalloc_large(ptr, size, flags);
>  }
> +#endif
>  
>  static inline void kfree_hook(const void *x)
>  {