linux-kernel - Re: NOHZ: WARNING: at arch/x86/kernel/smp.c:123 native_smp_send

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Message-ID: <20130510094556.GA23014@pd.tnic>
Date:	Fri, 10 May 2013 11:45:56 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Kosina <jkosina@...e.cz>, Tony Luck <tony.luck@...el.com>,
	linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: NOHZ: WARNING: at arch/x86/kernel/smp.c:123
 native_smp_send_reschedule

On Fri, May 10, 2013 at 11:37:29AM +0200, Ingo Molnar wrote:
> The pattern I use in such cases is:
> 
> 	if (WARN_ONCE(!cpu_online(cpu))) {
> 		printk("%d %d\n", cpu, smp_processor_id());
> 		dump_stack();
> 	}

Cool, and WARN_ONCE dumps stack already so:

	if (WARN_ONCE(!cpu_online(cpu)))
		printk("%d %d\n", cpu, smp_processor_id());

Nice.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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