diff mbox series

[15/16] mm/slab_common: move definition of __ksize() to mm/slab.h

Message ID 20220712133946.307181-16-42.hyeyoo@gmail.com (mailing list archive)
State New
Headers show
Series common kmalloc v3 | expand

Commit Message

Hyeonggon Yoo July 12, 2022, 1:39 p.m. UTC 
__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@gmail.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
---
 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(-)

Comments

Vlastimil Babka July 29, 2022, 11:47 a.m. UTC | #1 
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@gmail.com>
> Reviewed-by: Vlastimil Babka <vbabka@suse.cz>

Nit: The subject and changelog should probably say declaration, not definition.

> ---
>  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)
>  {
Hyeonggon Yoo Aug. 2, 2022, 9:25 a.m. UTC | #2 
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@gmail.com>
> > Reviewed-by: Vlastimil Babka <vbabka@suse.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)
> >  {
>
diff mbox series

Patch

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)
 {