linux-kernel - Re: [PATCH 2/5] metag: smp: enable irqs after set_cpu

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Message-ID: <alpine.DEB.2.02.1307012342030.4013@ionos.tec.linutronix.de>
Date:	Mon, 1 Jul 2013 23:42:24 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	James Hogan <james.hogan@...tec.com>
cc:	linux-kernel@...r.kernel.org, Kirill Tkhai <tkhai@...dex.ru>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Subject: Re: [PATCH 2/5] metag: smp: enable irqs after set_cpu_online

On Mon, 1 Jul 2013, James Hogan wrote:

> In secondary_start_kernel() interrupts should be enabled with
> local_irq_enable() after the cpu is marked as online with
> set_cpu_online(). Otherwise it's possible for a timer interrupt to
> trigger a softirq, which if the cpu is marked as offline may have it's
> affinity altered.
> 
> Reported-by: Kirill Tkhai <tkhai@...dex.ru>
> Signed-off-by: James Hogan <james.hogan@...tec.com>
> Cc: Kirill Tkhai <tkhai@...dex.ru>
> Cc: "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>

Acked-by: Thomas Gleixner <tglx@...utronix.de>
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