Re: [PATCH] mm: fix overflow in find_zone_movable_pfns_for_nodes()

[Yasuaki Ishimatsu]

On Wed, 30 Sep 2015 17:33:42 +0800
Xishi Qiu <qiuxishi@xxxxxxxxxx> wrote:

> If user set "movablecore=xx" to a large number, corepages will overflow,
> this patch fix the problem.
> 
> Signed-off-by: Xishi Qiu <qiuxishi@xxxxxxxxxx>
> ---

Looks good to me.

Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx>

Thanks,
Yasuaki Ishimatsu

>  mm/page_alloc.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 48aaf7b..af3c9bd 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -5668,6 +5668,7 @@ static void __init find_zone_movable_pfns_for_nodes(void)
>  		 */
>  		required_movablecore =
>  			roundup(required_movablecore, MAX_ORDER_NR_PAGES);
> +		required_movablecore = min(totalpages, required_movablecore);
>  		corepages = totalpages - required_movablecore;
>  
>  		required_kernelcore = max(required_kernelcore, corepages);
> -- 
> 2.0.0
> 
> 
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