linux-kernel - Re: [PATCH v3.1] [resend] Resurrect Intel740 driver: i740fb

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Message-ID: <CAOZdJXWp24Kday8vt6vXsr6bYbVyLmMqrFfY_n7kboKpj0a8Ug@mail.gmail.com>
Date:	Sun, 4 Dec 2011 02:35:59 +0000
From:	Tabi Timur-B04825 <B04825@...escale.com>
To:	Florian Tobias Schandinat <FlorianSchandinat@....de>
CC:	Ondrej Zary <linux@...nbow-software.org>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3.1] [resend] Resurrect Intel740 driver: i740fb

On Sat, Dec 3, 2011 at 3:45 PM, Florian Tobias Schandinat
<FlorianSchandinat@....de> wrote:
>
>> +     return !!(i740inreg(par, XRX, REG_DDC_STATE) & DDC_SCL);
>
> Why "!!"?

This is a trick that guarantees that the return value is either 0 or
1.  Without the !!, the return value will be either 0 or DDC_SCL.

-- 
Timur Tabi
Linux kernel developer at Freescale
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