linux-kernel - [RFC PATCH v1 14/15] mm/sl[auo]b: move definition of _

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Date:   Tue,  8 Mar 2022 11:41:41 +0000
From:   Hyeonggon Yoo <42.hyeyoo@...il.com>
To:     linux-mm@...ck.org
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>,
        Vlastimil Babka <vbabka@...e.cz>,
        Marco Elver <elver@...gle.com>,
        Matthew WilCox <willy@...radead.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        linux-kernel@...r.kernel.org, 42.hyeyoo@...il.com
Subject: [RFC PATCH v1 14/15] mm/sl[auo]b: move definition of __ksize() to mm/slab.h

__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.

[ willy@...radead.org: Move definition to mm/slab.h and reduce comments ]

Signed-off-by: Hyeonggon Yoo <42.hyeyoo@...il.com>
Reviewed-by: Vlastimil Babka <vbabka@...e.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(-)

diff --git a/include/linux/slab.h b/include/linux/slab.h
index 8da8beff712f..a3f8a103f318 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -182,7 +182,6 @@ 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 bfedfe3900bb..4fd4bd7bb4d7 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -673,6 +673,8 @@ 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 6533026b4a6b..07ed382ed5a9 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -976,15 +976,7 @@ void kfree(const void *x)
 }
 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;
@@ -999,7 +991,6 @@ 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 836a7d1ae996..59ddf80e987c 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -576,7 +576,6 @@ 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)
 {
-- 
2.33.1