linux-kernel - Re: [PATCH v3 2/3] perf/ibs: Fix interface via core pmu events

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Date:   Wed, 3 May 2023 14:03:53 +0530
From:   Ravi Bangoria <ravi.bangoria@....com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     namhyung@...nel.org, eranian@...gle.com, acme@...nel.org,
        mark.rutland@....com, jolsa@...nel.org, irogers@...gle.com,
        bp@...en8.de, kan.liang@...ux.intel.com, adrian.hunter@...el.com,
        maddy@...ux.ibm.com, x86@...nel.org,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        sandipan.das@....com, ananth.narayan@....com,
        santosh.shukla@....com, Ravi Bangoria <ravi.bangoria@....com>
Subject: Re: [PATCH v3 2/3] perf/ibs: Fix interface via core pmu events

On 02-May-23 9:07 PM, Peter Zijlstra wrote:
> On Tue, Apr 25, 2023 at 07:52:04PM +0530, Ravi Bangoria wrote:
>> diff --git a/kernel/events/core.c b/kernel/events/core.c
>> index 151299940d9a..232121a6d1e2 100644
>> --- a/kernel/events/core.c
>> +++ b/kernel/events/core.c
>> @@ -11648,16 +11648,6 @@ static struct pmu *perf_init_event(struct perf_event *event)
>>  		goto unlock;
>>  	}
>>  
>> -	list_for_each_entry_rcu(pmu, &pmus, entry, lockdep_is_held(&pmus_srcu)) {
>> -		ret = perf_try_init_event(pmu, event);
>> -		if (!ret)
>> -			goto unlock;
>> -
>> -		if (ret != -ENOENT) {
>> -			pmu = ERR_PTR(ret);
>> -			goto unlock;
>> -		}
>> -	}
>>  fail:
>>  	pmu = ERR_PTR(-ENOENT);
>>  unlock:
> 
> Would it make sense to put the above and the below cleanup in a separate
> patch after this?

Sure. I'll cleanup and respin.

Thanks,
Ravi