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Message-ID: <f927f969-028a-4ad4-7776-527ed537c77f@amd.com>
Date: Wed, 21 Sep 2022 16:09:16 +0530
From: K Prateek Nayak <kprateek.nayak@....com>
To: Borislav Petkov <bp@...en8.de>
Cc: linux-kernel@...r.kernel.org, rafael@...nel.org, lenb@...nel.org,
linux-acpi@...r.kernel.org, linux-pm@...r.kernel.org,
dave.hansen@...ux.intel.com, tglx@...utronix.de, andi@...as.de,
puwen@...on.cn, mario.limonciello@....com, peterz@...radead.org,
rui.zhang@...el.com, gpiccoli@...lia.com,
daniel.lezcano@...aro.org, ananth.narayan@....com,
gautham.shenoy@....com, Calvin Ong <calvin.ong@....com>,
stable@...r.kernel.org, regressions@...ts.linux.dev
Subject: Re: [PATCH] ACPI: processor_idle: Skip dummy wait for processors
based on the Zen microarchitecture
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
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