linux-kernel - Re: [PATCH v3 13/13] mmc: mmci: Add Qcom specific pio

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Date:	Wed, 28 May 2014 09:51:59 +0100
From:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	Russell King <linux@....linux.org.uk>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	Chris Ball <chris@...ntf.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH v3 13/13] mmc: mmci: Add Qcom specific pio_read function.



On 28/05/14 09:08, Linus Walleij wrote:
> On Fri, May 23, 2014 at 2:53 PM,  <srinivas.kandagatla@...aro.org> wrote:
>
>> +       if (unlikely(bytes)) {
>> +               unsigned char buf[4];
> (...)

>
> Please think twice about this.
> http://lwn.net/Articles/70473/
> http://lwn.net/Articles/420019/
> http://lwn.net/Articles/182369/
>
Thanks for the warning.

You are right. I think having likely/unlikely is not always right here.

thanks,
srini
> Yours,
> Linus Walleij
>
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