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

[H. Peter Anvin]

Neil Horman wrote:
> 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

If they can't, then they can't use your driver either.

> > > 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?

Yes, there are plenty of systems which don't have an RTC, or have an RTC 
which can't generate interrupts.

	-hpa

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