linux-kernel - Re: One of these things (CONFIG

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Message-ID: <20130121224449.GZ23505@n2100.arm.linux.org.uk>
Date:	Mon, 21 Jan 2013 22:44:49 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	John Stultz <john.stultz@...aro.org>
Cc:	Arnd Bergmann <arnd@...db.de>, Matt Sealey <matt@...esi-usa.com>,
	Linux ARM Kernel ML <linux-arm-kernel@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, Ben Dooks <ben@...tec.co.uk>
Subject: Re: One of these things (CONFIG_HZ) is not like the others..

On Mon, Jan 21, 2013 at 02:18:20PM -0800, John Stultz wrote:
> So we used to have the ACTHZ code to handle error from the HZ rate  
> requested and the HZ rate possible given the underlying hardware. That's  
> been moved to the register_refined_jiffies(), but do you have a sense if  
> there a reason it couldn't be used? I don't quite recall the bounds at  
> this second, so ~7% error might very well be too large.
>
> So yes, I suspect these sorts of platforms, where there are no modern  
> clocksource/clockevent driver, as well as further constraints (like  
> specific HZ) are likely not good candidates for a multi-arch build.

In this particular case, EBSA110 is not a candidate for multi-arch
build anyway, because it's ARMv4 and we're only really bothering with
ARMv6 and better.

Not only that, but the IO stuff on it is sufficiently obscure and
non-standard...
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