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

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Message-ID: <4a700de4-8540-d5d8-8c58-3465c0a7a55a@suse.de>
Date:   Thu, 16 Feb 2017 13:35:58 +0100
From:   Johannes Thumshirn <jthumshirn@...e.de>
To:     Ming Lei <tom.leiming@...il.com>, Shaohua Li <shli@...nel.org>,
        Jens Axboe <axboe@...com>, linux-kernel@...r.kernel.org,
        linux-raid@...r.kernel.org, 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 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.

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