Re: [PATCH 1/3] perf/x86/intel: Factor out common code of PMI handler

["Liang, Kan" <kan.liang@linux.intel.com>]

On 8/6/2018 2:20 PM, Peter Zijlstra wrote:
> On Mon, Aug 06, 2018 at 10:23:41AM -0700, kan.liang@linux.intel.com wrote:
>> +	if (++loops > 100) {
>> +		static bool warned;
>> +
>> +		if (!warned) {
>> +			WARN(1, "perfevents: irq loop stuck!\n");
>> +			perf_event_print_debug();
>> +			warned = true;
>> +		}
> 
> Bah, that really reads like we want WARN_ONCE(), except for that
> perf_event_print_debug() thing :/
> 

Yes. I went though the log. To make the WARN text pair with 
perf_event_print_debug(), we open-coded WARN_ONCE()'s
one-time-only logic here since commit ae0def05ed85 ("perf/x86: Only 
print PMU state when also WARN()'ing")

I think I will still keep the logic here and just fix the complaint from 
checkpatch.pl.

Thanks,
Kan