linux-kernel - Re: [PATCH] ACPI: processor idle: Practically limit "Dummy wait" workaround to old Intel systems

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Message-ID: <edfe5f4c-70fa-5fcc-868f-497c428445f1@amd.com>
Date:   Fri, 23 Sep 2022 13:36:52 -0500
From:   Kim Phillips <kim.phillips@....com>
To:     Dave Hansen <dave.hansen@...el.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        linux-kernel@...r.kernel.org
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Len Brown <lenb@...nel.org>,
        Mario Limonciello <Mario.Limonciello@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>,
        K Prateek Nayak <kprateek.nayak@....com>,
        linux-acpi@...r.kernel.org, Linux PM <linux-pm@...r.kernel.org>,
        stable@...r.kernel.org
Subject: Re: [PATCH] ACPI: processor idle: Practically limit "Dummy wait"
 workaround to old Intel systems

On 9/22/22 2:01 PM, Dave Hansen wrote:
> On 9/22/22 11:53, Rafael J. Wysocki wrote:
>> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>>
>> or do you want me to pick this up?
> 
> I'll just stick it in x86/urgent.
> 
> It's modifying code in a x86 #ifdef.  I'll call it a small enclave of
> sovereign x86 territory in ACPI land, just like an embassy. ;)

Can it be cc:stable@...r.kernel.org, since it applies cleanly as far
back as this v5.4 commit?:

commit fa583f71a99c85e52781ed877c82c8757437b680

Author: Yin Fengwei <fengwei.yin@...el.com>

Date:   Thu Oct 24 15:04:20 2019 +0800



     ACPI: processor_idle: Skip dummy wait if kernel is in guest


Thanks,

Kim