linux-kernel - Re: [PATCH] [1/4] x86: MCE: Make polling timer interval per CPU

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Date:	Wed, 08 Apr 2009 12:43:28 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
Cc:	hpa@...or.com, linux-kernel@...r.kernel.org, mingo@...e.hu,
	tglx@...utronix.de
Subject: Re: [PATCH] [1/4] x86: MCE: Make polling timer interval per CPU

Hidetoshi Seto <seto.hidetoshi@...fujitsu.com> writes:
>>  
>> @@ -632,14 +633,14 @@
>>  static void mce_init_timer(void)
>>  {
>>  	struct timer_list *t = &__get_cpu_var(mce_timer);
>> +	int *n = &__get_cpu_var(next_interval);
>>  
>> -	/* data race harmless because everyone sets to the same value */
>> -	if (!next_interval)
>> -		next_interval = check_interval * HZ;
>> -	if (!next_interval)
>
> [plan A]
> Add
> 	if (!check_interval)
> 		return;
>
> Or...
>
>> +	if (!*n)
>> +		*n = check_interval * HZ;
>> +	if (!*n)
>>  		return;


The !*n will return for check_interval == 0 because 0*HZ is still 0 so it should be 
equivalent. Did I miss something?

-Andi


-- 
ak@...ux.intel.com -- Speaking for myself only.
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