linux-kernel - Re: [PATCH] driver: ip27-rtc - convert ioctl to unlocked

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Message-ID: <478B8D54.7010400@gmail.com>
Date:	Mon, 14 Jan 2008 17:27:00 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
CC:	Paul Gortmaker <p_gortmaker@...oo.com>,
	LKML <linux-kernel@...r.kernel.org>, Andi Kleen <ak@...e.de>,
	Alexey Dobriyan <adobriyan@...il.com>
Subject: Re: [PATCH] driver: ip27-rtc - convert ioctl to unlocked_ioctl

On 01/14/2008 05:07 PM, Cyrill Gorcunov wrote:
> Yes, process would be stopped, and not *just* stopped but could spend
> all his cpu time-slice in attempt to get spinlock (espec if set time is
> much longer than read), but if we use mutex here the process could just
> sleep instead of trying to get spinlock granted. Am I wrong? Or this is
> not worth to do it?

I would say no. It'll spin only for nanoseconds there.
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