linux-kernel - Re: [PATCH RFC 04/14] block, bfq: modify the peak-rate estimator

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Date:   Tue, 7 Mar 2017 00:47:50 +0000
From:   Bart Van Assche <Bart.VanAssche@...disk.com>
To:     "tj@...nel.org" <tj@...nel.org>,
        "paolo.valente@...aro.org" <paolo.valente@...aro.org>,
        "axboe@...nel.dk" <axboe@...nel.dk>
CC:     "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "fchecconi@...il.com" <fchecconi@...il.com>,
        "avanzini.arianna@...il.com" <avanzini.arianna@...il.com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "broonie@...nel.org" <broonie@...nel.org>
Subject: Re: [PATCH RFC 04/14] block, bfq: modify the peak-rate estimator

On Sat, 2017-03-04 at 17:01 +0100, Paolo Valente wrote:
> +static sector_t get_sdist(sector_t last_pos, struct request *rq)
> +{
> +	sector_t sdist = 0;
> +
> +	if (last_pos) {
> +		if (last_pos < blk_rq_pos(rq))
> +			sdist = blk_rq_pos(rq) - last_pos;
> +		else
> +			sdist = last_pos - blk_rq_pos(rq);
> +	}
> +
> +	return sdist;
> +}

Have you considered to use abs() from <linux/kernel.h>?

Thanks,

Bart.