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

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Message-ID: <CAMuHMdUzys9pbEjUybyDP-3=uemLZuP5WgXeyONxGmADUJJL4A@mail.gmail.com>
Date:	Tue, 16 Dec 2014 13:40:47 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Magnus Damm <magnus.damm@...il.com>
Cc:	Laurent Pinchart <laurent.pinchart@...asonboard.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 Magnus,

On Tue, Dec 16, 2014 at 12:46 PM, Magnus Damm <magnus.damm@...il.com> wrote:
>> Could you please confirm that you've tested both CONFIG_PREEMPT_NONE and
>> CONFIG_PREEMPT with and without the ARM TWD times, and that you've booted to
>> userspace and tested timer broadcast on all CPUs ?
>
> No I have not. I've booted to user space in initramfs with DT-based
> TWD on Multiplatform for r8a7779. Without this fix (and other r8a7779
> TWD bits) I see a lot of breakage. For instance, TWD and SMP boot is
> broken on r8a7779 - both legacy and non-legacy. I have not gotten to
> sh73a0 yet, but I assume it is busted too.

FWIW, I applied this patch, and booted the result successfully and without
any user-visible changes on:
  - koelsch
  - armadillo-multiplatform
  - kzm9g-legacy
  - kzm9g-multiplatform

Armadillo-legacy is broken, and probably won't come back (cfr.
https://lkml.org/lkml/2014/12/2/339).

Kzm9g-reference still hangs at "Calibrating local timer..." (it did work
at some point in the past).

Note that my local tree is based on renesas-drivers-2014-12-08-v3.18,
renesas-devel-20141212-v3.18, and yesterday's upstream, with CCF,
PM domain, TWD, and lots of WIP patches from the kitchen sink applied.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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