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

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Message-ID: <44C66C91.8090700@zytor.com>
Date:	Tue, 25 Jul 2006 12:10:09 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Neil Horman <nhorman@...driver.com>
CC:	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:
>
> In general I agree, but that only works if you operate on a platform that
> supports virtual syscalls, and has vdso configured.  I'm not overly familiar
> with vdso, but I didn't think vdso could be supported on all platforms/arches.
> This seems like it might be a nice addition in those cases.
> 

Not really.  This introduces a potentially very difficult support 
user-visible interface.  Consider a tickless kernel -- you might end up 
taking tick interrupts ONLY to update this page, since you don't have 
any way of knowing when userspace wants to look at it.

	-hpa
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