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

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Message-ID: <20060725235644.GA5147@localhost.localdomain>
Date:	Tue, 25 Jul 2006 19:56:44 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Segher Boessenkool <segher@...nel.crashing.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Dave Airlie <airlied@...il.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 01:29:25AM +0200, Segher Boessenkool wrote:
> >Yes, but if its in trade for something thats being used currently  
> >which hurts
> >more (case in point being the X server), using this solution is a  
> >net gain.
> 
> ...in the short term.
> 
And for any arch that isn't able to leverage a speedup via a vdso implementation
of a simmilar functionality in the long term

> >I'm not arguing with you that adding a low res gettimeofday  
> >vsyscall is a better
> >long term solution, but doing that requires potentially several  
> >implementations
> >in the C library accross a range of architectures, some of which  
> >may not be able
> >to provide a time solution any better than what the gettimeofday  
> >syscall
> >provides today.  The /dev/rtc solution is easy, available right  
> >now, and applies
> >to all arches.
> 
> "All"?
> 
It there any arch for which the rtc driver doesn't function?
Neil

> 
> Segher
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