linux-kernel - Re: [PATCH 13/17] md: raid1: use bio_segments

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Message-ID: <fc4d24ec-55a1-7280-f734-c9b8c4a0ecae@suse.de>
Date:   Thu, 16 Feb 2017 14:34:32 +0100
From:   Johannes Thumshirn <jthumshirn@...e.de>
To:     Ming Lei <tom.leiming@...il.com>
Cc:     Shaohua Li <shli@...nel.org>, Jens Axboe <axboe@...com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:SOFTWARE RAID (Multiple Disks) SUPPORT" 
        <linux-raid@...r.kernel.org>,
        linux-block <linux-block@...r.kernel.org>,
        Christoph Hellwig <hch@...radead.org>,
        NeilBrown <neilb@...e.com>
Subject: Re: [PATCH 13/17] md: raid1: use bio_segments_all()

On 02/16/2017 02:32 PM, Ming Lei wrote:
> On Thu, Feb 16, 2017 at 8:35 PM, Johannes Thumshirn <jthumshirn@...e.de> wrote:
>> On 02/16/2017 12:45 PM, Ming Lei wrote:
>>> @@ -998,7 +998,8 @@ static void alloc_behind_pages(struct bio *bio, struct r1bio *r1_bio)
>>>  {
>>>       int i;
>>>       struct bio_vec *bvec;
>>> -     struct bio_vec *bvecs = kzalloc(bio->bi_vcnt * sizeof(struct bio_vec),
>>> +     unsigned vcnt = bio_segments_all(bio);
>>> +     struct bio_vec *bvecs = kzalloc(vcnt * sizeof(struct bio_vec),
>>>                                       GFP_NOIO);
>>
>> Maybe use kcalloc() instead of kzalloc() with a multiplication.
> 
> That doesn't belong to this patch, which just wants to remove direct
> access to .bi_vcnt.

But you're touching it anyways, aren't you?


-- 
Johannes Thumshirn                                          Storage
jthumshirn@...e.de                                +49 911 74053 689
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