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

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Date:	Sat, 29 Jul 2006 23:49:48 +0200
From:	Edgar Toernig <froese@....de>
To:	Bill Huey (hui) <billh@...ppy.monkey.org>
Cc:	Neil Horman <nhorman@...driver.com>, Jim Gettys <jg@...top.org>,
	"H. Peter Anvin" <hpa@...or.com>, Dave Airlie <airlied@...il.com>,
	Segher Boessenkool <segher@...nel.crashing.org>,
	linux-kernel@...r.kernel.org, a.zummo@...ertech.it,
	jg@...edesktop.org, Keith Packard <keithp@...thp.com>,
	"Bill Huey (hui)" <billh@...ppy.monkey.org>
Subject: Re: [PATCH] RTC: Add mmap method to rtc character driver

Bill Huey (hui) wrote:
>
> > Its always been the case.  Its hardware can only support one timer (or at least
> > one timer period), and as such multiple users would interefere with each other.
> 
> Well, this points out a serious problem with doing an mmap extension to
> /dev/rtc. It would be better to have a page mapped by another device like
> /dev/jiffy_counter, or something like that rather than to overload the
> /dev/rtc with that functionality.

You mean something like this, /dev/itimer?

    http://marc.theaimsgroup.com/?m=115412412427996

Ciao, ET.
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