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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/