linux-kernel - Re: [PATCH 15/16] mm/slab_common: move definition of _

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Date:   Tue, 2 Aug 2022 18:25:01 +0900
From:   Hyeonggon Yoo <42.hyeyoo@...il.com>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Joe Perches <joe@...ches.com>,
        Vasily Averin <vasily.averin@...ux.dev>,
        Matthew WilCox <willy@...radead.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 15/16] mm/slab_common: move definition of __ksize() to
 mm/slab.h

On Fri, Jul 29, 2022 at 01:47:23PM +0200, Vlastimil Babka wrote:
> On 7/12/22 15:39, Hyeonggon Yoo wrote:
> > __ksize() is only called by KASAN. Remove export symbol and move
> > definition to mm/slab.h as we don't want to grow its callers.
> > 
> > Signed-off-by: Hyeonggon Yoo <42.hyeyoo@...il.com>
> > Reviewed-by: Vlastimil Babka <vbabka@...e.cz>
> 
> Nit: The subject and changelog should probably say declaration, not definition.

Ah, right. will do.
Thanks!

> 
> > ---
> >  include/linux/slab.h |  1 -
> >  mm/slab.h            |  2 ++
> >  mm/slab_common.c     | 11 +----------
> >  mm/slob.c            |  1 -
> >  4 files changed, 3 insertions(+), 12 deletions(-)
> > 
> > diff --git a/include/linux/slab.h b/include/linux/slab.h
> > index 4ee5b2fed164..701fe538650f 100644
> > --- a/include/linux/slab.h
> > +++ b/include/linux/slab.h
> > @@ -187,7 +187,6 @@ int kmem_cache_shrink(struct kmem_cache *s);
> >  void * __must_check krealloc(const void *objp, size_t new_size, gfp_t flags) __alloc_size(2);
> >  void kfree(const void *objp);
> >  void kfree_sensitive(const void *objp);
> > -size_t __ksize(const void *objp);
> >  size_t ksize(const void *objp);
> >  #ifdef CONFIG_PRINTK
> >  bool kmem_valid_obj(void *object);
> > diff --git a/mm/slab.h b/mm/slab.h
> > index 9193e9c1f040..ad634e02b3cb 100644
> > --- a/mm/slab.h
> > +++ b/mm/slab.h
> > @@ -678,6 +678,8 @@ void free_large_kmalloc(struct folio *folio, void *object);
> >  
> >  #endif /* CONFIG_SLOB */
> >  
> > +size_t __ksize(const void *objp);
> > +
> >  static inline size_t slab_ksize(const struct kmem_cache *s)
> >  {
> >  #ifndef CONFIG_SLUB
> > diff --git a/mm/slab_common.c b/mm/slab_common.c
> > index c01c6b8f0d34..1f8db7959366 100644
> > --- a/mm/slab_common.c
> > +++ b/mm/slab_common.c
> > @@ -1003,15 +1003,7 @@ void kfree(const void *object)
> >  }
> >  EXPORT_SYMBOL(kfree);
> >  
> > -/**
> > - * __ksize -- Uninstrumented ksize.
> > - * @objp: pointer to the object
> > - *
> > - * Unlike ksize(), __ksize() is uninstrumented, and does not provide the same
> > - * safety checks as ksize() with KASAN instrumentation enabled.
> > - *
> > - * Return: size of the actual memory used by @objp in bytes
> > - */
> > +/* Uninstrumented ksize. Only called by KASAN. */
> >  size_t __ksize(const void *object)
> >  {
> >  	struct folio *folio;
> > @@ -1026,7 +1018,6 @@ size_t __ksize(const void *object)
> >  
> >  	return slab_ksize(folio_slab(folio)->slab_cache);
> >  }
> > -EXPORT_SYMBOL(__ksize);
> >  #endif /* !CONFIG_SLOB */
> >  
> >  gfp_t kmalloc_fix_flags(gfp_t flags)
> > diff --git a/mm/slob.c b/mm/slob.c
> > index 97a4d2407f96..91d6e2b19929 100644
> > --- a/mm/slob.c
> > +++ b/mm/slob.c
> > @@ -584,7 +584,6 @@ size_t __ksize(const void *block)
> >  	m = (unsigned int *)(block - align);
> >  	return SLOB_UNITS(*m) * SLOB_UNIT;
> >  }
> > -EXPORT_SYMBOL(__ksize);
> >  
> >  int __kmem_cache_create(struct kmem_cache *c, slab_flags_t flags)
> >  {
> 

-- 
Thanks,
Hyeonggon