linux-kernel - Re: [PATCH -suspend] Hibernate: Replace unnecessary evaluation of pfn_to

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Date:	Mon, 8 Dec 2008 08:26:58 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Len Brown <lenb@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: [PATCH -suspend] Hibernate: Replace unnecessary evaluation of
	pfn_to_page()

On Mon 2008-12-08 00:52:49, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@...k.pl>
> Subject: Hibernate: Replace unnecessary evaluation of pfn_to_page()
> 
> Replace one evaluation of pfn_to_page() in copy_data_pages() with
> the value of a local variable containing the right number already.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>

Acked-by: Pavel Machek <pavel@...e.cz>

> ---
>  kernel/power/snapshot.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Index: linux-2.6/kernel/power/snapshot.c
> ===================================================================
> --- linux-2.6.orig/kernel/power/snapshot.c
> +++ linux-2.6/kernel/power/snapshot.c
> @@ -981,7 +981,7 @@ static void copy_data_page(unsigned long
>  			 * data modified by kmap_atomic()
>  			 */
>  			safe_copy_page(buffer, s_page);
> -			dst = kmap_atomic(pfn_to_page(dst_pfn), KM_USER0);
> +			dst = kmap_atomic(d_page, KM_USER0);
>  			memcpy(dst, buffer, PAGE_SIZE);
>  			kunmap_atomic(dst, KM_USER0);
>  		} else {

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