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

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Date:   Mon, 22 May 2017 13:56:21 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     David Rientjes <rientjes@...gle.com>
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

El Mon, May 22, 2017 at 01:39:26PM -0700 David Rientjes ha dit:

> 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.

clang warns about unused static inline functions outside of header
files, in difference to 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)
> >  {