linux-kernel - Re: [PATCH V2 2/3] scsi: fix compiler warning for sg

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Message-ID: <CAHp75Veg7FmxYD7oLuE9ZsvFmOvvaxC5ooB2fgdQHfiTJCw0vg@mail.gmail.com>
Date:	Tue, 10 Nov 2015 11:23:42 +0200
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Timur Tabi <timur@...eaurora.org>
Cc:	Sinan Kaya <okaya@...eaurora.org>,
	linux-scsi <linux-scsi@...r.kernel.org>, cov@...eaurora.org,
	jcm@...hat.com, Andy Gross <agross@...eaurora.org>,
	linux-arm-msm@...r.kernel.org,
	linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
	Doug Gilbert <dgilbert@...erlog.com>,
	"James E.J. Bottomley" <JBottomley@...n.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 2/3] scsi: fix compiler warning for sg

On Tue, Nov 10, 2015 at 6:53 AM, Timur Tabi <timur@...eaurora.org> wrote:
> Sinan Kaya wrote:
>>
>>
>> The code says it is using these macros for small integers only which
>> can't overflow. I was trying to get rid of compiler warning and it seems
>> to have disappeared.
>
>
> I would double-check the assembly code, if I were you.  I don't like it when
> warnings just go away like that.

+1 to that.

>
> Besides, we *should* be using do_div() for 64-bit division.

But here looks like all numbers are guaranteed to be less than or
equal to INT_MAX.
Thus, the matter is only to replace MULDIV() by mult_frac() which is
already in kernel.

-- 
With Best Regards,
Andy Shevchenko
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