[PATCH] compat: Backport kmalloc_array()

[PATCH] compat: Backport kmalloc_array()

[Ozan Çağlayan]

The new radeon DRM driver from 3.6 uses kmalloc_array().

This backports:

commit a8203725dfded5c1f79dca3368a4a273e24b59bb
Author: Xi Wang <xi.wang@gmail.com>
Date:   Mon Mar 5 15:14:41 2012 -0800

    slab: introduce kmalloc_array()

[root@ozan linux-2.6]# git describe --contains a8203725
v3.4-rc1~56^2~1

Trying kernel 3.5.0-030500-generic [OK]
Trying kernel 3.4.4-030404-generic [OK]
Trying kernel 3.3.7-030307-generic [OK]
Trying kernel 3.2.2-030202-generic [OK]
Trying kernel 3.1.10-030110-generic [OK]
Trying kernel 3.0.18-030018-generic [OK]
Trying kernel 2.6.39-02063904-generic [OK]
Trying kernel 2.6.38-02063808-generic [OK]
Trying kernel 2.6.37-02063706-generic [OK]
Trying kernel 2.6.36-02063604-generic [OK]
Trying kernel 2.6.35-02063512-generic [OK]
Trying kernel 2.6.34-02063410-generic [OK]
Trying kernel 2.6.33-02063305-generic [OK]
Trying kernel 2.6.32-02063255-generic [OK]
Trying kernel 2.6.31-02063113-generic [OK]
Trying kernel 2.6.30-02063010-generic [OK]
Trying kernel 2.6.29-02062906-generic [OK]
Trying kernel 2.6.28-02062810-generic [OK]
Trying kernel 2.6.27-020627-generic [OK]
Trying kernel 2.6.26-020626-generic [OK]
Trying kernel 2.6.25-020625-generic [OK]
Trying kernel 2.6.24-020624-generic [OK]

Signed-off-by: Ozan Çağlayan <ozancag@gmail.com>
---
 include/linux/compat-3.4.h |   18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/include/linux/compat-3.4.h b/include/linux/compat-3.4.h
index e603f4c..06a3a07 100644
--- a/include/linux/compat-3.4.h
+++ b/include/linux/compat-3.4.h
@@ -5,6 +5,24 @@
 
 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,4,0))
 
+/* This backports:
+ *
+ * commit a8203725dfded5c1f79dca3368a4a273e24b59bb
+ * Author: Xi Wang <xi.wang@gmail.com>
+ * Date:   Mon Mar 5 15:14:41 2012 -0800
+ *
+ * 	slab: introduce kmalloc_array()
+ */
+
+/* SIZE_MAX is backported in compat-3.5.h so include it */
+#include <linux/compat-3.5.h>
+static inline void *kmalloc_array(size_t n, size_t size, gfp_t flags)
+{
+	if (size != 0 && n > SIZE_MAX / size)
+		return NULL;
+	return __kmalloc(n * size, flags);
+}
+
 #include <linux/etherdevice.h>
 #include <linux/skbuff.h>
 
-- 
1.7.10.4

Re: [PATCH] compat: Backport kmalloc_array()

[Luis R. Rodriguez]

On Mon, Aug 6, 2012 at 6:36 AM, Ozan Çağlayan <ozancag@gmail.com> wrote:
> The new radeon DRM driver from 3.6 uses kmalloc_array().
>
> This backports:
>
> commit a8203725dfded5c1f79dca3368a4a273e24b59bb
> Author: Xi Wang <xi.wang@gmail.com>
> Date:   Mon Mar 5 15:14:41 2012 -0800
>
>     slab: introduce kmalloc_array()
>
> [root@ozan linux-2.6]# git describe --contains a8203725
> v3.4-rc1~56^2~1
>
> Trying kernel 3.5.0-030500-generic [OK]
> Trying kernel 3.4.4-030404-generic [OK]
> Trying kernel 3.3.7-030307-generic [OK]
> Trying kernel 3.2.2-030202-generic [OK]
> Trying kernel 3.1.10-030110-generic [OK]
> Trying kernel 3.0.18-030018-generic [OK]
> Trying kernel 2.6.39-02063904-generic [OK]
> Trying kernel 2.6.38-02063808-generic [OK]
> Trying kernel 2.6.37-02063706-generic [OK]
> Trying kernel 2.6.36-02063604-generic [OK]
> Trying kernel 2.6.35-02063512-generic [OK]
> Trying kernel 2.6.34-02063410-generic [OK]
> Trying kernel 2.6.33-02063305-generic [OK]
> Trying kernel 2.6.32-02063255-generic [OK]
> Trying kernel 2.6.31-02063113-generic [OK]
> Trying kernel 2.6.30-02063010-generic [OK]
> Trying kernel 2.6.29-02062906-generic [OK]
> Trying kernel 2.6.28-02062810-generic [OK]
> Trying kernel 2.6.27-020627-generic [OK]
> Trying kernel 2.6.26-020626-generic [OK]
> Trying kernel 2.6.25-020625-generic [OK]
> Trying kernel 2.6.24-020624-generic [OK]
>
> Signed-off-by: Ozan Çağlayan <ozancag@gmail.com>

Applied and pushed! Thanks!

  Luis