linux-kernel - Re: [PATCH 11/15] libnvdimm: pmem, blk, and btt make

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Date:	Sun, 21 Jun 2015 06:26:23 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Christoph Hellwig <hch@....de>
Cc:	Jens Axboe <axboe@...nel.dk>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	Boaz Harrosh <boaz@...xistor.com>,
	"Kani, Toshimitsu" <toshi.kani@...com>,
	Vishal Verma <vishal.l.verma@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH 11/15] libnvdimm: pmem, blk, and btt make_request cleanups

On Sun, Jun 21, 2015 at 3:10 AM, Christoph Hellwig <hch@....de> wrote:
> One patch per driver please.
>
>> diff --git a/drivers/nvdimm/blk.c b/drivers/nvdimm/blk.c
>> index 8a6345797a71..9d609ef95266 100644
>> --- a/drivers/nvdimm/blk.c
>> +++ b/drivers/nvdimm/blk.c
>> @@ -170,18 +170,12 @@ static void nd_blk_make_request(struct request_queue *q, struct bio *bio)
>>       struct bvec_iter iter;
>>       struct bio_vec bvec;
>>       int err = 0, rw;
>> -     sector_t sector;
>>
>> -     sector = bio->bi_iter.bi_sector;
>> -     if (bio_end_sector(bio) > get_capacity(disk)) {
>> +     if (unlikely(bio_end_sector(bio) > get_capacity(disk))) {
>>               err = -EIO;
>>               goto out;
>>       }
>>
>> -     BUG_ON(bio->bi_rw & REQ_DISCARD);
>
> If you remove the DISCARD check you can kill the max sectors one
> as well, given that generic_make_request_checks() takes care of it.

Ah, true, will add that with the split.
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