linux-kernel - Re: [PATCH v8 9/9] x86/smpboot: Serialize topology updates for secondary bringup

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Message-ID: <87v8k5s3dq.ffs@tglx>
Date:   Mon, 13 Feb 2023 21:43:13 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Usama Arif <usama.arif@...edance.com>, dwmw2@...radead.org,
        kim.phillips@....com
Cc:     arjan@...ux.intel.com, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, hpa@...or.com, x86@...nel.org,
        pbonzini@...hat.com, paulmck@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        rcu@...r.kernel.org, mimoja@...oja.de, hewenliang4@...wei.com,
        thomas.lendacky@....com, seanjc@...gle.com, pmenzel@...gen.mpg.de,
        fam.zheng@...edance.com, punit.agrawal@...edance.com,
        simon.evans@...edance.com, liangma@...ngbit.com,
        David Woodhouse <dwmw@...zon.co.uk>,
        Usama Arif <usama.arif@...edance.com>
Subject: Re: [PATCH v8 9/9] x86/smpboot: Serialize topology updates for
 secondary bringup

On Thu, Feb 09 2023 at 15:41, Usama Arif wrote:
> From: David Woodhouse <dwmw@...zon.co.uk>
>
> The toplogy update is performed by the AP via smp_callin() after the BSP
> has called do_wait_cpu_initialized(), setting the AP's bit in
> cpu_callout_mask to allow it to proceed.
>
> In preparation to enable further parallelism of AP bringup, add locking to
> serialize the update even if multiple APs are (in future) permitted to
> proceed through the next stages of bringup in parallel.

This one is also only relevant for further parallelisation, right?

Thanks,

        tglx