linux-kernel - Re: [PATCH 33/36] AArch64: Generic timers support

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Message-ID: <4FFF0BE9.2010307@linaro.org>
Date:	Thu, 12 Jul 2012 10:39:53 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	Marc Zyngier <marc.zyngier@....com>
CC:	Linus Walleij <linus.walleij@...aro.org>,
	Deepak Saxena <dsaxena@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Walleij <linus.ml.walleij@...il.com>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Will Deacon <will.deacon@....com>,
	Mike Turquette <mike.turquette@...aro.org>,
	Marc Zyngier <maz@...terjones.org>
Subject: Re: [PATCH 33/36] AArch64: Generic timers support

On 07/12/2012 10:31 AM, Marc Zyngier wrote:
> On Thu, 12 Jul 2012 09:57:33 -0700, John Stultz <john.stultz@...aro.org>
> wrote:
>
>> So following ia64's method is probably better then copying the 8253's
>> rate if you're not concerned about tick-granularity error.
> The 8253 is completely meaningless in our case (though I'm sure someone
> could try and bold one on the side of an Aarch64 CPU...), so going the ia64
> way is probably best (erm... this last bit doesn't sound quite right,
> doesn't it?).

Sorry, the "copying the 8253's" bit didn't come out sarcastic enough.  :)

The best solution would be to include the actual tick-granularity, but 
given its not really an architecture constant (which CLOCK_TICK_RATE 
assumes), that probably wouldn't be appropriate.

thanks
-john

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