linux-kernel - Re: [PATCH] x86: Don't print number of MCE banks for every CPU

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Date:	Tue, 27 Oct 2009 12:42:29 -0700
From:	Mike Travis <travis@....com>
To:	Roland Dreier <rdreier@...co.com>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	x86@...nel.org
Subject: Re: [PATCH] x86: Don't print number of MCE banks for every CPU

Hi Roland,

I've found that I'm getting one of these lines for every cpu:

mce: CPU supports 0 MCE banks

Regards,
Mike

Roland Dreier wrote:
> The MCE initialization code explicitly says it doesn't handle asymmetric
> configurations where different CPUs support different numbers of MCE
> banks, and it prints a big warning in that case.  Therefore, printing
> the "mce: CPU supports <x> MCE banks" message into the kernel log for
> every CPU is pure redundancy that clutters the log significantly for
> systems with lots of CPUs.
> 
> Signed-off-by: Roland Dreier <rolandd@...co.com>
> ---
>  arch/x86/kernel/cpu/mcheck/mce.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
> index b1598a9..721a77c 100644
> --- a/arch/x86/kernel/cpu/mcheck/mce.c
> +++ b/arch/x86/kernel/cpu/mcheck/mce.c
> @@ -1214,7 +1214,8 @@ static int __cpuinit mce_cap_init(void)
>  	rdmsrl(MSR_IA32_MCG_CAP, cap);
>  
>  	b = cap & MCG_BANKCNT_MASK;
> -	printk(KERN_INFO "mce: CPU supports %d MCE banks\n", b);
> +	if (!banks)
> +		printk(KERN_INFO "mce: CPU supports %d MCE banks\n", b);
>  
>  	if (b > MAX_NR_BANKS) {
>  		printk(KERN_WARNING
> --
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