[PATCH] powerpc/mce: Remove per cpu variables from MCE handlers

[Ganesh]

On 12/8/20 4:01 PM, Michael Ellerman wrote:
> Ganesh Goudar <ganeshgr at linux.ibm.com> writes:
>> diff --git a/arch/powerpc/include/asm/paca.h b/arch/powerpc/include/asm/paca.h
>> index 9454d29ff4b4..4769954efa7d 100644
>> --- a/arch/powerpc/include/asm/paca.h
>> +++ b/arch/powerpc/include/asm/paca.h
>> @@ -273,6 +274,17 @@ struct paca_struct {
>>   #ifdef CONFIG_MMIOWB
>>   	struct mmiowb_state mmiowb_state;
>>   #endif
>> +#ifdef CONFIG_PPC_BOOK3S_64
>> +	int mce_nest_count;
>> +	struct machine_check_event mce_event[MAX_MC_EVT];
>> +	/* Queue for delayed MCE events. */
>> +	int mce_queue_count;
>> +	struct machine_check_event mce_event_queue[MAX_MC_EVT];
>> +
>> +	/* Queue for delayed MCE UE events. */
>> +	int mce_ue_count;
>> +	struct machine_check_event  mce_ue_event_queue[MAX_MC_EVT];
>> +#endif /* CONFIG_PPC_BOOK3S_64 */
>>   } ____cacheline_aligned;
> How much does this expand the paca by?

Size of paca is 4480 bytes, these add up another 2160 bytes, so expands it by 48%.