Re: [PATCH v9 3/3] s390/pai: Support CPU hotplug for PMU PAI

[Thomas Richter <tmricht@linux.ibm.com>]

On 9/1/26 16:19, Heiko Carstens wrote:
> On Tue, Sep 01, 2026 at 02:33:20PM +0200, Thomas Richter wrote:
>> +	/* CPUHP_BP_PREPARE_DYN --> before CPU is brought online */
>> +	rc = cpuhp_setup_state(CPUHP_BP_PREPARE_DYN, "perf/pai:prepare",
>> +			       pai_online_cpu, pai_offline_cpu);
>> +	if (rc < 0)
>> +		goto out_debug;
>> +
>>  	if (!paipmu_setup()) {
>>  		/* No PMU registration, no need for debug buffer */
>> -		debug_unregister_view(paidbg, &debug_sprintf_view);
>> -		debug_unregister(paidbg);
>> -		return -ENODEV;
>> +		rc = -ENODEV;
>> +		goto out_cpuhp;
>>  	}
>>  	return 0;
>> +
>> +out_cpuhp:
>> +	cpuhp_remove_state(rc);
> 
> This would now use "-ENODEV" as state for cpuhp_remove_state. I fixed
> it up since I suggested this code, so you can blame me in any case.

Ahhh right, thanks for fixing this for me.
-- 
Thomas Richter, Dept 3303, IBM s390 Linux Development, Boeblingen, Germany
--
IBM Deutschland Research & Development GmbH

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