linux-kernel - [PATCH -next 1/2] mm/slab: add is_kmalloc

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Message-Id: <20221121135024.1655240-1-feng.tang@intel.com>
Date:   Mon, 21 Nov 2022 21:50:23 +0800
From:   Feng Tang <feng.tang@...el.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>
Cc:     linux-mm@...ck.org, kasan-dev@...glegroups.com,
        linux-kernel@...r.kernel.org, Feng Tang <feng.tang@...el.com>
Subject: [PATCH -next 1/2] mm/slab: add is_kmalloc_cache() helper macro

commit 6edf2576a6cc ("mm/slub: enable debugging memory wasting of
kmalloc") introduces 'SLAB_KMALLOC' bit specifying whether a
kmem_cache is a kmalloc cache for slab/slub (slob doesn't have
dedicated kmalloc caches).

Add a helper macro for other components like kasan to simplify code.

Signed-off-by: Feng Tang <feng.tang@...el.com>
---
 include/linux/slab.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/slab.h b/include/linux/slab.h
index 1c670c16c737..ee6499088ad3 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -758,6 +758,12 @@ extern void kvfree_sensitive(const void *addr, size_t len);
 
 unsigned int kmem_cache_size(struct kmem_cache *s);
 
+#ifndef CONFIG_SLOB
+#define is_kmalloc_cache(s) ((s)->flags & SLAB_KMALLOC)
+#else
+#define is_kmalloc_cache(s) (false)
+#endif
+
 /**
  * kmalloc_size_roundup - Report allocation bucket size for the given size
  *
-- 
2.34.1