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Message-Id: <1153854962.8932.49.camel@laptopd505.fenrus.org> Date: Tue, 25 Jul 2006 21:16:02 +0200 From: Arjan van de Ven <arjan@...radead.org> To: "John W. Linville" <linville@...driver.com> Cc: Neil Horman <nhorman@...driver.com>, linux-kernel@...r.kernel.org, a.zummo@...ertech.it, jg@...edesktop.org Subject: Re: [PATCH] RTC: Add mmap method to rtc character driver On Tue, 2006-07-25 at 15:07 -0400, John W. Linville wrote: > On Tue, Jul 25, 2006 at 08:53:16PM +0200, Arjan van de Ven wrote: > > On Tue, 2006-07-25 at 14:43 -0400, Neil Horman wrote: > > > > alternative, which, as I mentioned before I would be happy to take a crack at, > > > if you would elaborate on your idea a little more. > > > > well the idea that has been tossed about a few times is using a vsyscall > > function that either calls into the kernel, or directly uses the hpet > > page (which can be user mapped) to get time information that way... > > or even would use rdtsc in a way the kernel knows is safe (eg corrected > > for the local cpu's speed and offset etc etc). > > Aren't both of those examples x86(_64)-specific? Wouldn't a generic > solution be preferrable? the implementation is; the interface.. not so. other platforms can implement their optimal solution obviously... - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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