linux-kernel - Re: [patch] setup_boot_APIC

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Date:	Thu, 22 Mar 2007 11:56:41 +0100
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [patch] setup_boot_APIC_clock() irq-enable fix

On Thu, 2007-03-22 at 10:31 +0100, Ingo Molnar wrote:
> Subject: [patch] setup_boot_APIC_clock() irq-enable fix
> From: Ingo Molnar <mingo@...e.hu>
> 
> latest -git triggers an irqtrace/lockdep warning of a leaked
> irqs-off condition:
> 
>   BUG: at kernel/fork.c:1033 copy_process()
> 
> after some debugging it turns out that commit ca1b940c accidentally left 
> interrupts disabled - which trickled down all the way to the first time 
> we fork a kernel thread and triggered the warning.
> 
> the fix is to re-enable interrupts in the 'else' branch of 
> setup_boot_APIC_clock()'s pmtimers calibration path.
> 
> Reported-by: Michal Piotrowski <michal.k.k.piotrowski@...il.com>
> Signed-off-by: Ingo Molnar <mingo@...e.hu>

Acked-by: Thomas Gleixner <tglx@...wn.paperbag.linutronix.de>



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