Re: [PATCH] ACPI: processor_idle: Skip dummy wait for processors based on the Zen microarchitecture

[K Prateek Nayak]

Hello Boris,

On 9/21/2022 2:17 PM, Borislav Petkov wrote:
> On Wed, Sep 21, 2022 at 12:06:38PM +0530, K Prateek Nayak wrote:
>> diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
>> index 16a1663d02d4..18850aa2b79b 100644
>> --- a/drivers/acpi/processor_idle.c
>> +++ b/drivers/acpi/processor_idle.c
>> @@ -528,8 +528,11 @@ static int acpi_idle_bm_check(void)
>>  static void wait_for_freeze(void)
>>  {
>>  #ifdef	CONFIG_X86
>> -	/* No delay is needed if we are in guest */
>> -	if (boot_cpu_has(X86_FEATURE_HYPERVISOR))
>> +	/*
>> +	 * No delay is needed if we are in guest or on a processor
>> +	 * based on the Zen microarchitecture.
>> +	 */
>> +	if (boot_cpu_has(X86_FEATURE_HYPERVISOR) || boot_cpu_has(X86_FEATURE_ZEN))
> 
> s/boot_cpu_has/cpu_feature_enabled/g

I was not aware of cpu_feature_enabled() and it makes perfect sense to
use it here. Thank you for bringing it to my notice.
I'll make this change in v2.

> 
> while at it.
> 

--
Thanks and Regards,
Prateek