linux-kernel - Re: [PATCH v2 5/5] gpio / ACPI: Add support for ACPI GPIO operation regions

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Date:	Thu, 13 Mar 2014 15:05:02 +0000
From:	"Cox, Alan" <alan.cox@...el.com>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Alexandre Courbot <gnurou@...il.com>,
	"Lan, Tianyu" <tianyu.lan@...el.com>,
	"Zheng, Lv" <lv.zheng@...el.com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 5/5] gpio / ACPI: Add support for ACPI GPIO operation
 regions

> > +                       gpiod_set_raw_value(desc, !!((1 << i) & *value));
> 
> What is this? How can the expression !!((1 << i) possibly evaluate to
> anything else than "true"? I don't get it. Just (desc, *value) seem more
> apropriate.


The expression is !!((1 << i) & *value)

so its the standard C sematic for 'logical and' ? 1 : 0


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