linux-kernel - Re: [PATCH 04/10] omap_hwspinlock: Replace "hweight_long(i & 0xf) != 1" with "!is_power_of

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Message-ID: <CAK=WgbZhhbjOyb0ktsSSsw2s6rw=NDDSJZ0G-84gRKw-J7gy=w@mail.gmail.com>
Date:	Mon, 7 Dec 2015 18:16:58 +0200
From:	Ohad Ben-Cohen <ohad@...ery.com>
To:	"zhaoxiu.zeng" <zhaoxiu.zeng@...il.com>
Cc:	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 04/10] omap_hwspinlock: Replace "hweight_long(i & 0xf) !=
 1" with "!is_power_of_2(i & 0xf)"

On Mon, Dec 7, 2015 at 5:03 PM, zhaoxiu.zeng <zhaoxiu.zeng@...il.com> wrote:
> is_power_of_2 is simple, and faster than "hweightN(x) == 1" on most architectures.

Thanks. I'm not sure that speed is a major concern here, since this
code executes only once during the lifetime of the driver. Readability
is probably more important.
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