Re: [RFC][PATCH] kmalloc + memset(foo, 0, bar) = kmalloc0

[Breno Silva]

Do correct kmalloc+memset in new funcion.

Breno
----- Original Message -----
From: "Rolf Eike Beer" <eike-kernel@xxxxxxxxx>
To: <linux-kernel@xxxxxxxxxxxxxxx>
Sent: Thursday, September 11, 2003 10:40 AM
Subject: [RFC][PATCH] kmalloc + memset(foo, 0, bar) = kmalloc0


> Hi,
>
> a (very) simple grep in drivers/ showed more than 300 matches of code like
> this:
>
> foo = kmalloc(bar, baz);
> if (! foo)
> return -ENOMEM;
> memset(foo, 0, sizeof(foo));
>
> Why not add a small inlined function doing the memset for us
> and reducing the code to
>
> foo = kmalloc0(bar, baz);
> if (! foo)
> return -ENOMEM;
>
> Eike
>
> --- linux-2.6.0-test5-bk1/include/linux/slab.h 2003-09-11
15:19:40.000000000 +0200
> +++ linux-2.6.0-test5-bk1-caliban/include/linux/slab.h 2003-09-11
15:22:56.000000000 +0200
> @@ -14,6 +14,7 @@
>  #include <linux/config.h> /* kmalloc_sizes.h needs CONFIG_ options */
>  #include <linux/gfp.h>
>  #include <linux/types.h>
> +#include <linux/string.h> /* for memset */
>  #include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */
>  #include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */
>
> @@ -97,6 +98,16 @@
>   return __kmalloc(size, flags);
>  }
>
> +static inline void *kmalloc0(size_t size, int flags)
> +{
> + void *res = kmalloc(size, flags);
> +
> + if (res != NULL)
> + memset(res, 0, size);
> +
> + return res;
> +}
> +
>  extern void kfree(const void *);
>  extern unsigned int ksize(const void *);
>
> -
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