linux-kernel - Re: [PATCH 05/10] block: convert to pos and nr

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Date:	Wed, 29 Apr 2009 19:19:49 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
CC:	axboe@...nel.dk, linux-kernel@...r.kernel.org, jeff@...zik.org,
	linux-ide@...r.kernel.org, James.Bottomley@...senPartnership.com,
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	Jeff Garzik <jgarzik@...ox.com>
Subject: Re: [PATCH 05/10] block: convert to pos and nr_sectors accessors

Hello,

Geert Uytterhoeven wrote:
>> diff --git a/drivers/block/z2ram.c b/drivers/block/z2ram.c
>> index b66ad58..d4e6b71 100644
>> --- a/drivers/block/z2ram.c
>> +++ b/drivers/block/z2ram.c
>> @@ -71,12 +71,12 @@ static void do_z2_request(struct request_queue *q)
>>  {
>>  	struct request *req;
>>  	while ((req = elv_next_request(q)) != NULL) {
>> -		unsigned long start = req->sector << 9;
>> -		unsigned long len  = req->current_nr_sectors << 9;
>> +		unsigned long start = blk_rq_pos(req) << 9;
>> +		unsigned long len  = blk_rq_cur_sectors(req) << 9;
>                 ^^^^^^^^^^^^^
> I guess this one can become `unsigned int' now, as:
> 
> static inline unsigned int blk_rq_cur_sectors(struct request *rq)
> {
> 	return blk_rq_cur_bytes(rq) >> 9;
> }
> 
> and blk_rq_cur_bytes(rq) returns `int', so it must fit in an `int' anyway?

Yeap, it should fit.  Given the way len is used there and the previous
usage had the same type promotion there, I think it's better to leave
the unsigned long alone there.

Acked-by added.  Thanks.

-- 
tejun
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