linux-kernel - Re: [PATCH next 3/4] blk-mq: user (1 << order) to implement order_to

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Date:	Thu, 17 Apr 2014 21:03:22 +0200
From:	Jörg-Volker Peetz <jvpeetz@....de>
To:	linux-kernel@...r.kernel.org
Cc:	Christoph Hellwig <hch@....de>
Subject: Re: [PATCH next 3/4] blk-mq: user (1 << order) to implement order_to_size()

Ming Lei wrote, on 04/17/2014 17:49:
> Signed-off-by: Ming Lei <tom.leiming@...il.com>
> ---
>  block/blk-mq.c |    7 +------
>  1 file changed, 1 insertion(+), 6 deletions(-)
> 
> diff --git a/block/blk-mq.c b/block/blk-mq.c
> index baff2d0..1eff3d9 100644
> --- a/block/blk-mq.c
> +++ b/block/blk-mq.c
> @@ -1130,12 +1130,7 @@ static void blk_mq_free_rq_map(struct blk_mq_tag_set *set,
>  
>  static size_t order_to_size(unsigned int order)
>  {
> -	size_t ret = PAGE_SIZE;
> -
> -	while (order--)
> -		ret *= 2;
> -
> -	return ret;
> +	return (1 << order) * PAGE_SIZE;

Shouldn't this be

        return ((size_t)1 << order) * PAGE_SIZE;

?
>  }
>  
>  static struct blk_mq_tags *blk_mq_init_rq_map(struct blk_mq_tag_set *set,
> 

Regards,
jvp.


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