linux-kernel - Re: [RFC PATCH v6 2/3] arm64: fix a migrating irq bug when hotplug cpu

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Message-ID: <20151009165501.GY17192@e104818-lin.cambridge.arm.com>
Date:	Fri, 9 Oct 2015 17:55:01 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Yang Yingliang <yangyingliang@...wei.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Mark Rutland <mark.rutland@....com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Marc Zyngier <marc.zyngier@....com>,
	Will Deacon <will.deacon@....com>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jiang Liu <jiang.liu@...ux.intel.com>
Subject: Re: [RFC PATCH v6 2/3] arm64: fix a migrating irq bug when hotplug
 cpu

On Thu, Sep 24, 2015 at 05:32:14PM +0800, Yang Yingliang 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@...ux.intel.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Marc Zyngier <marc.zyngier@....com>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Russell King - ARM Linux <linux@....linux.org.uk>
> Cc: Hanjun Guo <hanjun.guo@...aro.org>
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>

I queued this patch for 4.4, on top of this branch from Thomas:

  git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git irq/for-arm

The arm (32-bit) patch would need to go via Russell's tree (patch
system, pull request or waiting until 4.4-rc1, it's up to Russell).

Thanks.

-- 
Catalin
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