linux-kernel - Re: [PATCH] non-swapcache pages in end_swap_bio

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Date:	Fri, 07 Jun 2013 13:51:33 -0700
From:	Joe Perches <joe@...ches.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Artem Savkov <artem.savkov@...il.com>, minchan.kernel.2@...il.com,
	dan.magenheimer@...cle.com, rjw@...k.pl, linux-mm@...ck.org,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] non-swapcache pages in end_swap_bio_read()

On Fri, 2013-06-07 at 13:43 -0700, Andrew Morton wrote:
> On Sat,  8 Jun 2013 00:23:18 +0400 Artem Savkov <artem.savkov@...il.com> wrote:
[]
> +++ a/mm/page_io.c
[]
> +	/*
> +	 * There is no guarantee that the page is in swap cache - the software
> +	 * suspend code (at least) uses end_swap_bio_read() against a non-
> +	 * swapcache page.  So we must check PG_swapcache before proceeding with
> +	 * this optimization.
> +	 */
> +	if (likely(PageSwapCache(page))) {

or

	if (unlikely(!PageSwapCache(page)))
		goto out;

to save an indent level

> +out:
>  	unlock_page(page);
>  	bio_put(bio);
>  }


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