linux-kernel - Re: Memory corruption during hibernation since 2.6.31

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Message-Id: <20100729142245.4AA5.A69D9226@jp.fujitsu.com>
Date:	Thu, 29 Jul 2010 14:23:33 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com, "Rafael J. Wysocki" <rjw@...k.pl>,
	Ondrej Zary <linux@...nbow-software.org>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Balbir Singh <balbir@...ibm.com>
Subject: Re: Memory corruption during hibernation since 2.6.31

> Index: linux-2.6.34.org/mm/swapfile.c
> ===================================================================
> --- linux-2.6.34.org.orig/mm/swapfile.c
> +++ linux-2.6.34.org/mm/swapfile.c
> @@ -316,7 +316,9 @@ checks:
>  		scan_base = offset = si->lowest_bit;
>  
>  	/* reuse swap entry of cache-only swap if not busy. */
> -	if (vm_swap_full() && si->swap_map[offset] == SWAP_HAS_CACHE) {
> +	if (vm_swap_full()
> +		&& usage == SWAP_HAS_CACHE
> +		&& si->swap_map[offset] == SWAP_HAS_CACHE) {
>  		int swap_was_freed;
>  		spin_unlock(&swap_lock);
>  		swap_was_freed = __try_to_reclaim_swap(si, offset);

Can you please add explicit commenting in the code?



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