linux-kernel - Re: [PATCH] block: replace kmalloc and then memcpy with kmemdup

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Date:	Mon, 11 Mar 2013 10:54:35 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Mihnea Dobrescu-Balaur <mihneadb@...il.com>
Cc:	xen-devel@...ts.xensource.com, jeremy@...p.org,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] block: replace kmalloc and then memcpy with kmemdup

On Mon, Mar 11, 2013 at 01:23:36PM +0200, Mihnea Dobrescu-Balaur wrote:

Are there performance improvements to doing it this way?

> Signed-off-by: Mihnea Dobrescu-Balaur <mihneadb@...il.com>
> ---
>  drivers/block/xen-blkfront.c |    3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
> index c3dae2e..9620644 100644
> --- a/drivers/block/xen-blkfront.c
> +++ b/drivers/block/xen-blkfront.c
> @@ -1203,11 +1203,10 @@ static int blkif_recover(struct blkfront_info *info)
>  	int j;
>  
>  	/* Stage 1: Make a safe copy of the shadow state. */
> -	copy = kmalloc(sizeof(info->shadow),
> +	copy = kmemdup(info->shadow, sizeof(info->shadow),
>  		       GFP_NOIO | __GFP_REPEAT | __GFP_HIGH);
>  	if (!copy)
>  		return -ENOMEM;
> -	memcpy(copy, info->shadow, sizeof(info->shadow));
>  
>  	/* Stage 2: Set up free list. */
>  	memset(&info->shadow, 0, sizeof(info->shadow));
> -- 
> 1.7.10.4
> 
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