linux-kernel - RE: [PATCH] x86/acpi/boot: Do not register processors that cannot be onlined for x2apic

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Message-ID: <SJ1PR11MB6083AD01A91B546343259939FCF49@SJ1PR11MB6083.namprd11.prod.outlook.com>
Date:   Tue, 3 Jan 2023 21:24:00 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>,
        "Zhang, Rui" <rui.zhang@...el.com>
CC:     "Brown, Len" <len.brown@...el.com>,
        "kvijayab@....com" <kvijayab@....com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "pavel@....cz" <pavel@....cz>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "Mario.Limonciello@....com" <Mario.Limonciello@....com>,
        "bp@...en8.de" <bp@...en8.de>, "hpa@...or.com" <hpa@...or.com>,
        "suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "bpetkov@....com" <bpetkov@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "santosh.shukla@....com" <santosh.shukla@....com>
Subject: RE: [PATCH] x86/acpi/boot: Do not register processors that cannot be
 onlined for x2apic

>> A dumb question, the Local SAPIC structure also uses the Local APIC
>> flags, and should we add the same check in acpi_parse_sapic()?
>
> I'm not sure if this matters in practice, because SAPIC is only used
> on IA64 anyway.
>
> Tony, what do you think?

I'm not maintaining IA64 anymore. If this change is only about saving
a small amount of memory for "impossible" CPUs, then it probably isn't
worth the churn.

-Tony