linux-kernel - Re: [PATCH] clocksource: arch_timer: Fix code to use physical timers when requested

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Message-ID: <20140911095725.GC5045@arm.com>
Date:	Thu, 11 Sep 2014 10:57:25 +0100
From:	Will Deacon <will.deacon@....com>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Catalin Marinas <Catalin.Marinas@....com>,
	Mark Rutland <Mark.Rutland@....com>,
	Olof Johansson <olof@...om.net>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Sonny Rao <sonnyrao@...omium.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Russell King <linux@....linux.org.uk>,
	Sudeep Holla <Sudeep.Holla@....com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] clocksource: arch_timer: Fix code to use physical timers
 when requested

On Wed, Sep 10, 2014 at 08:50:16PM +0100, Doug Anderson wrote:
> On Wed, Sep 10, 2014 at 11:46 AM, Will Deacon <will.deacon@....com> wrote:
> > If `where we're at' is trying to boot an ARMv7 product, then you can boot in
> > secure svc and lose virtualisation support. Looking forward to ARMv8, this
> > isn't going to work, so I'd encourage you to start thinking about getting
> > a working bootloader as a requirement.
> 
> Yup, definitely on the same page now.  With everyone working on this
> I'd imagine that there will be some nice standards worked out by the
> time real ARMv8 is ready to ship?
> 
> ...so would you say that you're in support of landing the patch to
> allow physical counters?  I know Olof has Acked the patch above, but
> it's nice if there's general agreement that it's OK.

I'm in favour of fixing the regression, yes. What I didn't understand from
the patch is where arch_timer_use_virtual is set to false for your machine,
as we need to be careful not to regress arm64 (the vdso uses the virtual
counter there).

Will
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