linux-kernel - [PATCH RFC v2] slab: introduce kmalloc

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Message-ID: <4F33CEAE.60400@gmail.com>
Date:	Thu, 09 Feb 2012 08:48:30 -0500
From:	Xi Wang <xi.wang@...il.com>
To:	Jens Axboe <axboe@...nel.dk>
CC:	Pekka Enberg <penberg@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	linux-kernel@...r.kernel.org, Christoph Lameter <cl@...ux.com>,
	Matt Mackall <mpm@...enic.com>,
	David Rientjes <rientjes@...gle.com>
Subject: [PATCH RFC v2] slab: introduce kmalloc_array

This patch introduces a kmalloc_array() wrapper that performs integer
overflow checking without zeroing the memory.

Suggested-by: Andrew Morton <akpm@...ux-foundation.org>
Suggested-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Xi Wang <xi.wang@...il.com>
---
Let's take "kxnalloc" off for now and keep the patch simple.
---
 include/linux/slab.h |   17 ++++++++++++++---
 1 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/include/linux/slab.h b/include/linux/slab.h
index 573c809..a595dce 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -190,7 +190,7 @@ size_t ksize(const void *);
 #endif
 
 /**
- * kcalloc - allocate memory for an array. The memory is set to zero.
+ * kmalloc_array - allocate memory for an array.
  * @n: number of elements.
  * @size: element size.
  * @flags: the type of memory to allocate.
@@ -240,11 +240,22 @@ size_t ksize(const void *);
  * for general use, and so are not documented here. For a full list of
  * potential flags, always refer to linux/gfp.h.
  */
-static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
+static inline void *kmalloc_array(size_t n, size_t size, gfp_t flags)
 {
 	if (size != 0 && n > ULONG_MAX / size)
 		return NULL;
-	return __kmalloc(n * size, flags | __GFP_ZERO);
+	return __kmalloc(n * size, flags);
+}
+
+/**
+ * kcalloc - allocate memory for an array. The memory is set to zero.
+ * @n: number of elements.
+ * @size: element size.
+ * @flags: the type of memory to allocate (see kmalloc).
+ */
+static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
+{
+	return kmalloc_array(n, size, flags | __GFP_ZERO);
 }
 
 #if !defined(CONFIG_NUMA) && !defined(CONFIG_SLOB)
-- 
1.7.5.4

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