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Date:   Wed, 21 Sep 2022 10:47:38 +0200
From:   Borislav Petkov <bp@alien8.de>
To:     K Prateek Nayak <kprateek.nayak@amd.com>
Cc:     linux-kernel@vger.kernel.org, rafael@kernel.org, lenb@kernel.org,
        linux-acpi@vger.kernel.org, linux-pm@vger.kernel.org,
        dave.hansen@linux.intel.com, tglx@linutronix.de, andi@lisas.de,
        puwen@hygon.cn, mario.limonciello@amd.com, peterz@infradead.org,
        rui.zhang@intel.com, gpiccoli@igalia.com,
        daniel.lezcano@linaro.org, ananth.narayan@amd.com,
        gautham.shenoy@amd.com, Calvin Ong <calvin.ong@amd.com>,
        stable@vger.kernel.org, regressions@lists.linux.dev
Subject: Re: [PATCH] ACPI: processor_idle: Skip dummy wait for processors
 based on the Zen microarchitecture
Message-ID: <YyrPqlo/ysCeh4qU@zn.tnic>
References: <20220921063638.2489-1-kprateek.nayak@amd.com>
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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

while at it.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette