linux-kernel - Re: [PATCH] ARM: twd: Adjust localtimer frequency withcpufreqnotifiers

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Message-ID: <20110513211512.GA30539@n2100.arm.linux.org.uk>
Date:	Fri, 13 May 2011 22:15:12 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Colin Cross <ccross@...roid.com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Srinidhi KASAGAR <srinidhi.kasagar@...ricsson.com>,
	Harald Gustafsson <harald.gustafsson@...csson.com>,
	linux-kernel@...r.kernel.org,
	Rickard ANDERSSON <rickard.andersson@...ricsson.com>,
	martin persson <martin.persson@...ricsson.com>,
	Varun Swara <Varun.Swara@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-arm-kernel@...ts.infradead.org,
	Jonas Åberg <jonas.aberg@...ricsson.com>
Subject: Re: [PATCH] ARM: twd: Adjust localtimer frequency
	withcpufreqnotifiers

On Fri, May 13, 2011 at 12:59:20PM +0200, Linus Walleij wrote:
> This patch is interesting because it uses calc_mult_shift() and the current
> localtimer driver for TWD (arch/arm/kernel/smp_twd.c) still uses hardcoded
> mult+shift.

I don't think there's any reason it uses a hard coded shift, just
that's what was the norm when the code was originally written.  It
(and many other clock event code) probably could do with an update.
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