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Tue, 02 Aug 2022 02:25:46 -0700 (PDT) Date: Tue, 2 Aug 2022 18:25:01 +0900 From: Hyeonggon Yoo <42.hyeyoo@gmail.com> To: Vlastimil Babka Cc: Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , Roman Gushchin , Joe Perches , Vasily Averin , Matthew WilCox , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 15/16] mm/slab_common: move definition of __ksize() to mm/slab.h Message-ID: References: <20220712133946.307181-1-42.hyeyoo@gmail.com> <20220712133946.307181-16-42.hyeyoo@gmail.com> <35ee9435-97b4-4161-b21c-15467b56d004@suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <35ee9435-97b4-4161-b21c-15467b56d004@suse.cz> ARC-Authentication-Results: i=1; imf20.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=Go+vOylz; spf=pass (imf20.hostedemail.com: domain of 42.hyeyoo@gmail.com designates 209.85.214.178 as permitted sender) smtp.mailfrom=42.hyeyoo@gmail.com; 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dkim=pass header.d=gmail.com header.s=20210112 header.b=Go+vOylz; spf=pass (imf20.hostedemail.com: domain of 42.hyeyoo@gmail.com designates 209.85.214.178 as permitted sender) smtp.mailfrom=42.hyeyoo@gmail.com; dmarc=pass (policy=none) header.from=gmail.com X-Rspamd-Server: rspam04 X-HE-Tag: 1659432348-593720 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 > > 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