[PATCH -next 2/2] mm/kasan: simplify is_kmalloc check

From: Feng Tang <feng.tang@intel.com>
To: Andrew Morton <akpm@linux-foundation.org>,
	Vlastimil Babka <vbabka@suse.cz>,
	Christoph Lameter <cl@linux.com>,
	Pekka Enberg <penberg@kernel.org>,
	David Rientjes <rientjes@google.com>,
	Joonsoo Kim <iamjoonsoo.kim@lge.com>,
	Roman Gushchin <roman.gushchin@linux.dev>,
	Hyeonggon Yoo <42.hyeyoo@gmail.com>,
	Andrey Konovalov <andreyknvl@gmail.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Andrey Ryabinin <ryabinin.a.a@gmail.com>,
	Alexander Potapenko <glider@google.com>,
	Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: linux-mm@kvack.org, kasan-dev@googlegroups.com,
	linux-kernel@vger.kernel.org, Feng Tang <feng.tang@intel.com>
Subject: [PATCH -next 2/2] mm/kasan: simplify is_kmalloc check
Date: Mon, 21 Nov 2022 21:50:24 +0800	[thread overview]
Message-ID: <20221121135024.1655240-2-feng.tang@intel.com> (raw)
In-Reply-To: <20221121135024.1655240-1-feng.tang@intel.com>

Use new is_kmalloc_cache() to simplify the code of checking whether
a kmem_cache is a kmalloc cache.

Signed-off-by: Feng Tang <feng.tang@intel.com>
---
 include/linux/kasan.h | 9 ---------
 mm/kasan/common.c     | 9 ++-------
 mm/slab_common.c      | 1 -
 3 files changed, 2 insertions(+), 17 deletions(-)

diff --git a/include/linux/kasan.h b/include/linux/kasan.h
index dff604912687..fc46f5d6f404 100644
--- a/include/linux/kasan.h
+++ b/include/linux/kasan.h
@@ -102,7 +102,6 @@ struct kasan_cache {
 	int alloc_meta_offset;
 	int free_meta_offset;
 #endif
-	bool is_kmalloc;
 };
 
 void __kasan_unpoison_range(const void *addr, size_t size);
@@ -129,13 +128,6 @@ static __always_inline bool kasan_unpoison_pages(struct page *page,
 	return false;
 }
 
-void __kasan_cache_create_kmalloc(struct kmem_cache *cache);
-static __always_inline void kasan_cache_create_kmalloc(struct kmem_cache *cache)
-{
-	if (kasan_enabled())
-		__kasan_cache_create_kmalloc(cache);
-}
-
 void __kasan_poison_slab(struct slab *slab);
 static __always_inline void kasan_poison_slab(struct slab *slab)
 {
@@ -252,7 +244,6 @@ static inline void kasan_poison_pages(struct page *page, unsigned int order,
 				      bool init) {}
 static inline bool kasan_unpoison_pages(struct page *page, unsigned int order,
 					bool init) { return false; }
-static inline void kasan_cache_create_kmalloc(struct kmem_cache *cache) {}
 static inline void kasan_poison_slab(struct slab *slab) {}
 static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
 					void *object) {}
diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index 1f30080a7a4c..f7e0e5067e7a 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -122,11 +122,6 @@ void __kasan_poison_pages(struct page *page, unsigned int order, bool init)
 			     KASAN_PAGE_FREE, init);
 }
 
-void __kasan_cache_create_kmalloc(struct kmem_cache *cache)
-{
-	cache->kasan_info.is_kmalloc = true;
-}
-
 void __kasan_poison_slab(struct slab *slab)
 {
 	struct page *page = slab_page(slab);
@@ -326,7 +321,7 @@ void * __must_check __kasan_slab_alloc(struct kmem_cache *cache,
 	kasan_unpoison(tagged_object, cache->object_size, init);
 
 	/* Save alloc info (if possible) for non-kmalloc() allocations. */
-	if (kasan_stack_collection_enabled() && !cache->kasan_info.is_kmalloc)
+	if (kasan_stack_collection_enabled() && is_kmalloc_cache(cache))
 		kasan_save_alloc_info(cache, tagged_object, flags);
 
 	return tagged_object;
@@ -372,7 +367,7 @@ static inline void *____kasan_kmalloc(struct kmem_cache *cache,
 	 * Save alloc info (if possible) for kmalloc() allocations.
 	 * This also rewrites the alloc info when called from kasan_krealloc().
 	 */
-	if (kasan_stack_collection_enabled() && cache->kasan_info.is_kmalloc)
+	if (kasan_stack_collection_enabled() && is_kmalloc_cache(cache))
 		kasan_save_alloc_info(cache, (void *)object, flags);
 
 	/* Keep the tag that was set by kasan_slab_alloc(). */
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 8276022f0da4..a5480d67f391 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -663,7 +663,6 @@ struct kmem_cache *__init create_kmalloc_cache(const char *name,
 
 	create_boot_cache(s, name, size, flags | SLAB_KMALLOC, useroffset,
 								usersize);
-	kasan_cache_create_kmalloc(s);
 	list_add(&s->list, &slab_caches);
 	s->refcount = 1;
 	return s;
-- 
2.34.1

