linux-kernel - Re: [PATCH v3 08/10] x86/mtrr: let cache_aps_delayed_init replace mtrr_aps_delayed

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Message-ID: <YzLcSOS6ZLIoPwBl@zn.tnic>
Date:   Tue, 27 Sep 2022 13:19:36 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Juergen Gross <jgross@...e.com>
Cc:     xen-devel@...ts.xenproject.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v3 08/10] x86/mtrr: let cache_aps_delayed_init replace
 mtrr_aps_delayed_init

On Tue, Sep 27, 2022 at 12:14:42PM +0200, Juergen Gross wrote:
> Yes: cpu hotplug.

You might need to elaborate here.

Because I see mtrr_ap_init() on the AP hotplug path:

native_cpu_up->
do_boot_cpu->
start_secondary->
smp_callin->
smp_store_cpu_info->
identify_secondary_cpu->
mtrr_ap_init

Which then means that we could check in mtrr_ap_init() if we're on the
hotplug path and still get rid of that stupid bool...

Close?

-- 
Regards/Gruss,
    Boris.

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