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

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Message-Id: <857D7DE9-D1F6-4A66-91F2-BC4D9044D42C@kernel.crashing.org>
Date:	Tue, 25 Jul 2006 20:56:14 +0200
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	Neil Horman <nhorman@...driver.com>
Cc:	linux-kernel@...r.kernel.org, a.zummo@...ertech.it,
	jg@...edesktop.org
Subject: Re: [PATCH] RTC: Add mmap method to rtc character driver

>> Similar functionality is already available via VDSO on
>> platforms that support it (currently PowerPC and AMD64?) --
>> seems like a better way forward.
>>
> In general I agree, but that only works if you operate on a  
> platform that
> supports virtual syscalls, and has vdso configured.

That's why I said "a better way forward", not "this already
works everywhere".

> I'm not overly familiar
> with vdso, but I didn't think vdso could be supported on all  
> platforms/arches.

Oh?  Which can not, and why?


Segher

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