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

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Message-ID: <44C69C2E.7000609@zytor.com>
Date:	Tue, 25 Jul 2006 15:33:18 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Neil Horman <nhorman@...driver.com>
CC:	Dave Airlie <airlied@...il.com>,
	Segher Boessenkool <segher@...nel.crashing.org>,
	linux-kernel@...r.kernel.org, a.zummo@...ertech.it,
	jg@...edesktop.org
Subject: Re: [PATCH] RTC: Add mmap method to rtc character driver

Neil Horman 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.
> 
> 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.  It has zero impact for systems which do not use it, and for
> those applications which make a decision to use it instead of an alternate
> method, the result I expect will be a net gain, until such time as we code up,
> test and roll out a vsyscall solution 
> 

Quick hacks are frowned upon in the Linux universe.  The kernel-user 
space interface is supposed to be stable, and thus a hack like this has 
to be maintained indefinitely.

Putting temporary hacks like this in is not a good idea.

	-hpa
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