From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S932270AbbJUU33 (ORCPT <rfc822;w@1wt.eu>);
	Wed, 21 Oct 2015 16:29:29 -0400
Received: from pandora.arm.linux.org.uk ([78.32.30.218]:54148 "EHLO
	pandora.arm.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1750846AbbJUU31 (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Wed, 21 Oct 2015 16:29:27 -0400
Date: Wed, 21 Oct 2015 21:29:08 +0100
From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Yang Yingliang <yangyingliang@huawei.com>,
        "linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Jiang Liu <jiang.liu@linux.intel.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Marc Zyngier <marc.zyngier@arm.com>,
        Mark Rutland <mark.rutland@arm.com>, Will Deacon <will.deacon@arm.com>,
        Hanjun Guo <hanjun.guo@linaro.org>,
        Linux-sh list <linux-sh@vger.kernel.org>
Subject: Re: [RFC PATCH v6 3/3] arm: fix a migrating irq bug when hotplug cpu
Message-ID: <20151021202907.GN32532@n2100.arm.linux.org.uk>
References: <1443087135-17044-1-git-send-email-yangyingliang@huawei.com>
 <1443087135-17044-4-git-send-email-yangyingliang@huawei.com>
 <CAMuHMdWyvaecQHOzFnxVZus_Pfkxjw1XfkGdcLK=D2ThaoJMzA@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CAMuHMdWyvaecQHOzFnxVZus_Pfkxjw1XfkGdcLK=D2ThaoJMzA@mail.gmail.com>
User-Agent: Mutt/1.5.23 (2014-03-12)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Wed, Oct 21, 2015 at 01:47:49PM +0200, Geert Uytterhoeven wrote:
> On Thu, Sep 24, 2015 at 11:32 AM, Yang Yingliang
> <yangyingliang@huawei.com> wrote:
> > When cpu is disabled, all irqs will be migratged to another cpu.
> > In some cases, a new affinity is different, the old affinity need
> > to be updated and if irq_set_affinity's return value is IRQ_SET_MASK_OK_DONE,
> > the old affinity can not be updated. Fix it by using irq_do_set_affinity.
> >
> > And migrating interrupts is a core code matter, so use the generic
> > function irq_migrate_all_off_this_cpu() to migrate interrupts in
> > kernel/irq/migration.c.
> >
> > Cc: Jiang Liu <jiang.liu@linux.intel.com>
> > Cc: Thomas Gleixner <tglx@linutronix.de>
> > Cc: Marc Zyngier <marc.zyngier@arm.com>
> > Cc: Mark Rutland <mark.rutland@arm.com>
> > Cc: Will Deacon <will.deacon@arm.com>
> > Cc: Russell King - ARM Linux <linux@arm.linux.org.uk>
> > Cc: Hanjun Guo <hanjun.guo@linaro.org>
> > Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
> > ---
> >  arch/arm/Kconfig           |  1 +
> >  arch/arm/include/asm/irq.h |  1 -
> >  arch/arm/kernel/irq.c      | 62 ----------------------------------------------
> >  arch/arm/kernel/smp.c      |  2 +-
> >  4 files changed, 2 insertions(+), 64 deletions(-)
> >
> > diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> > index 72ad724..bffba78 100644
> > --- a/arch/arm/Kconfig
> > +++ b/arch/arm/Kconfig
> > @@ -1492,6 +1492,7 @@ config NR_CPUS
> >  config HOTPLUG_CPU
> >         bool "Support for hot-pluggable CPUs"
> >         depends on SMP
> > +       select GENERIC_IRQ_MIGRATION
> 
> This causes the following warnings during s2ram on r8a7791/koelsch
> (dual-core CA15):

Thanks for the report.  I'll see what tonight's boot run says for my
platforms.  Hopefully, the author of these changes can help debug
this.

-- 
FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
according to speedtest.net.