linux-kernel - RE: [PATCHv5 00/11] Remove ARM local timer API

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Message-ID: <5EB3BFCD089AD643B9BB63439F5FD5E9012A244417@SHAASIEXM01.ASIA.ROOT.PRI>
Date:	Mon, 22 Apr 2013 02:26:24 +0000
From:	Barry Song <Barry.Song@....com>
To:	Stephen Boyd <sboyd@...eaurora.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	Mark Rutland <mark.rutland@....com>,
	Marc Zyngier <marc.zyngier@....com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Daniel Walker <dwalker@...o99.com>,
	Bryan Huntsman <bryanh@...eaurora.org>,
	Tony Lindgren <tony@...mide.com>,
	John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Thomas Abraham" <thomas.abraham@...aro.org>,
	DL-SHA-WorkGroupLinux <Workgroup.Linux@....com>
Subject: RE: [PATCHv5 00/11] Remove ARM local timer API

> -----Original Message-----
> From: Stephen Boyd [mailto:sboyd@...eaurora.org]
> Sent: Saturday, April 20, 2013 12:20 AM
> To: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org; linux-arm-msm@...r.kernel.org; Mark
> Rutland; Marc Zyngier; Kukjin Kim; Barry Song; Daniel Walker; Bryan Huntsman;
> Tony Lindgren; John Stultz; Thomas Gleixner; Thomas Abraham
> Subject: [PATCHv5 00/11] Remove ARM local timer API
> 
> In light of Mark Rutland's recent work on divorcing the ARM architected
> timers from the ARM local timer API and introducing a generic arch hook for
> broadcast it seems that we should remove the local timer API entirely.
> Doing so will reduce the architecture dependencies of our timer drivers,
> reduce code in ARM core, and simplify timer drivers because they no longer
> go through an architecture layer that is essentially a hotplug notifier.
> 
> Previous attempts have been made[1] unsuccessfully. I'm hoping this can
> be accepted now so that we can clean up the timer drivers that are
> used in both UP and SMP situations. Right now these drivers have to ignore
> the timer setup callback on the boot CPU to avoid registering clockevents
> twice. This is not very symmetric and causes convuluted code that does
> the same thing in two places.
> 
> Patches based on next-20130418
> 
> I'm still looking for Acks/Tested-by on EXYNOS and PRIMA2.

Stephen, I hope I can give a test soon. But I have some others in higher priority now.

> [1] http://article.gmane.org/gmane.linux.ports.arm.kernel/145705

-barry


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