linux-kernel - Re: [PATCH] RTC: Add mmap method to rtc character driver

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Date:	Tue, 25 Jul 2006 20:06:12 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Segher Boessenkool <segher@...nel.crashing.org>
Cc:	Paul Mackerras <paulus@...ba.org>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	a.zummo@...ertech.it, jg@...edesktop.org
Subject: Re: [PATCH] RTC: Add mmap method to rtc character driver

On Wed, Jul 26, 2006 at 01:27:46AM +0200, Segher Boessenkool wrote:
> >It's not that bad; if userspace is running, the cpu isn't idle, so
> >there isn't the motivation to go tickless on that cpu.  In other
> >words, if every cpu has suspended ticks, then no cpu can be running
> >stuff that needs to look at this page.
> 
> If I read the patch correctly, none of those legacy RTC ticks
> can ever be suspended though?
> 
Of course they can.  See rtc_do_ioctl, specifically the RTC_UIE_OFF and
RTC_PIE_OFF cases.
Neil

> 
> Segher
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