linux-kernel - Re: [PATCH 2/2] x86: don't panic if master CPU haven't set cpu_callout

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Message-ID: <1342043432.16730.899.camel@misato.fc.hp.com>
Date:	Wed, 11 Jul 2012 15:50:32 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	imammedo@...hat.com
Cc:	linux-kernel@...r.kernel.org, prarit@...hat.com, oleg@...hat.com,
	rob@...dley.net, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, x86@...nel.org, luto@....edu,
	suresh.b.siddha@...el.com, avi@...hat.com, a.p.zijlstra@...llo.nl,
	johnstul@...ibm.com, toshi.kani@...com
Subject: Re: [PATCH 2/2] x86: don't panic if master CPU haven't set
 cpu_callout_mask

On Wed, 2012-07-11 at 14:22 -0600, Toshi Kani wrote:
> Gracefully cancel CPU initialization instead of panic when master
> CPU haven't managed to set cpu_callout_mask in time.
> 
> Signed-off-by: Igor Mammedov <imammedo@...hat.com>
> ---
>  arch/x86/kernel/smpboot.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
> index 95948b9..6470470 100644
> --- a/arch/x86/kernel/smpboot.c
> +++ b/arch/x86/kernel/smpboot.c
> @@ -175,8 +175,9 @@ static void __cpuinit smp_callin(void)
>  	}
>  
>  	if (!time_before(jiffies, timeout)) {
> -		panic("%s: CPU%d started up but did not get a callout!\n",
> +		pr_debug("%s: CPU%d started up but did not get a callout!\n",
>  		      __func__, cpuid);

Shouldn't we use pr_err() here?

> +		goto die;

Is it safe to call remove_siblinginfo() in this code path?  It has not
called set_cpu_sibling_map() yet.

Thanks,
-Toshi



>  	}
>  
>  	/*


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