linux-kernel - Re: [BUGFIX][PATCH] fix return value of scan_lru

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Date:	Wed, 13 Oct 2010 14:08:57 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	stable@...nel.org
Subject: Re: [BUGFIX][PATCH] fix return value of scan_lru_pages in memory unplug

> CC'ed to stable tree...maybe all kernel has this bug.
> But this may not very critical because we've got no report until now.

Thanks.


> 
> ==
> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
> scan_lru_pages returns pfn. So, it's type should be "unsigned long"
> not "int".
> 
> Note: I guess this has been work until now because memory hotplug tester's
>       machine has not very big memory....
>       physical address < 32bit << PAGE_SHIFT.
> 
> Reported-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> ---
>  mm/memory_hotplug.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Index: mmotm-1008/mm/memory_hotplug.c
> ===================================================================
> --- mmotm-1008.orig/mm/memory_hotplug.c
> +++ mmotm-1008/mm/memory_hotplug.c
> @@ -646,7 +646,7 @@ static int test_pages_in_a_zone(unsigned
>   * Scanning pfn is much easier than scanning lru list.
>   * Scan pfn from start to end and Find LRU page.
>   */
> -int scan_lru_pages(unsigned long start, unsigned long end)
> +unsigned long scan_lru_pages(unsigned long start, unsigned long end)

Also, this can be static. anyway
	Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>




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