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 23:13:07 +0400
From:	Max Filippov <jcmvbkbc@...il.com>
To:	Jörg-Volker Peetz <jvpeetz@....de>
Cc:	LKML <linux-kernel@...r.kernel.org>, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH next 3/4] blk-mq: user (1 << order) to implement order_to_size()

On Thu, Apr 17, 2014 at 11:03 PM, Jörg-Volker Peetz <jvpeetz@....de> wrote:
> 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;
>
> ?

Maybe even

return (size_t)PAGE_SIZE << order;

?

-- 
Thanks.
-- Max
--
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