linux-kernel - Re: [PATCH] clocksource: sh_tmu: Set cpu_possible

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Message-ID: <1479998.RpvOtHlbHE@avalon>
Date:	Wed, 17 Dec 2014 13:31:14 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Magnus Damm <magnus.damm@...il.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	SH-Linux <linux-sh@...r.kernel.org>,
	"Simon Horman [Horms]" <horms@...ge.net.au>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] clocksource: sh_tmu: Set cpu_possible_mask to fix SMP broadcast

Hi Geert,

On Wednesday 17 December 2014 09:30:57 Geert Uytterhoeven wrote:
> On Wed, Dec 17, 2014 at 3:08 AM, Laurent Pinchart wrote:
> >> > Kzm9g-reference still hangs at "Calibrating local timer..." (it did
> >> > work at some point in the past).
> > 
> > kzm9g-reference boots for me with kzm9g_defconfig on Simon's devel branch
> > with
>
> OK.
> 
> I had expected the breakage to be something in my tree, either an issue in
> a -next branch I'm using, an interaction with the CCF patches or so, or a
> config issue (e.g. CONFIG_CPU_IDLE became broken lately if the TWD is
> not in DT).
> 
> > (By the way, how have you tested kzm9g-multiplatform given that none of
> > renesas-drivers-2014-12-08-v3.18, renesas-devel-20141212-v3.18 or today's
> > upstream support multiplatform kernels for sh73a0 ?)
> 
> As I said, my local tree contains lots of extra patches (erhm... 233).

We should probably synchronize at some point and get pending patches merged, 
or you'll loose sanity :-)

What multiplatform support patches do you plan to submit for v3.20 ?

> > Magnus, you have told me that you've performed tests on Marzen with
> > CONFIG_PREEMPT_NONE and with both TWD enabled and disabled. If you could
> > perform the same tests with CONFIG_PREEMPT instead without noticing any
> > regression I think we can merge your patch. Whatever breakage it has
> > caused in the past is likely hidden somewhere beyond eyesight.
> > 
> >> When the time allows I'd like us to try to fix up these somehow. At
> >> least I'll give it a go - I guess Armadillo is difficult without any
> >> board.
> 
> I do have an Armadillo.
> 
> > I'd like that very much. Let's get rid of r8a73a4 legacy (Ulrich's patches
> > should be ready) first, and possible sh73a0 and r8a7740 as well, and then
> > retest our various timers configurations. We should test both
> > CONFIG_PREEMPT and CONFIG_PREEMPT none, with all combination of the CMT,
> > TMU, MTU2, TWD and ARM architected timer enabled.
> 
> Yes, getting rid of more legacy is good. It's just a pity for the Penguin on
> the Armadillo's LCD, which doesn't want to visit armadillo-multiplatform.

-- 
Regards,

Laurent Pinchart

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