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

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Message-ID: <CACRpkdaoQZ4TTSyAiGuCAseyWd1e7PFGeQ0xjqwJqC=aasVdww@mail.gmail.com>
Date:	Fri, 14 Mar 2014 11:50:39 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	"Cox, Alan" <alan.cox@...el.com>
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

On Thu, Mar 13, 2014 at 4:05 PM, Cox, Alan <alan.cox@...el.com> wrote:
>> > +                       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

Hm I missed the first paranthesis when parsing in my head,
all wrong, too bad. Thanks Alan.

Yours,
Linus Walleij
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