linux-kernel - Re: [PATCH v4 3/4] xen: Mark "xen

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Date:   Fri, 4 Oct 2019 10:57:13 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Zhenzhong Duan <zhenzhong.duan@...cle.com>,
        linux-kernel@...r.kernel.org
Cc:     vkuznets@...hat.com, linux-hyperv@...r.kernel.org,
        kvm@...r.kernel.org, kys@...rosoft.com, haiyangz@...rosoft.com,
        sthemmin@...rosoft.com, sashal@...nel.org, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, pbonzini@...hat.com,
        rkrcmar@...hat.com, sean.j.christopherson@...el.com,
        wanpengli@...cent.com, jmattson@...gle.com, joro@...tes.org,
        jgross@...e.com, sstabellini@...nel.org, peterz@...radead.org,
        Jonathan Corbet <corbet@....net>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v4 3/4] xen: Mark "xen_nopvspin" parameter obsolete

On 10/3/19 10:02 AM, Zhenzhong Duan wrote:
> Map "xen_nopvspin" to "nopvspin", fix stale description of "xen_nopvspin"
> as we use qspinlock now.
>
> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@...cle.com>
> Cc: Jonathan Corbet <corbet@....net>
> Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> Cc: Juergen Gross <jgross@...e.com>
> Cc: Stefano Stabellini <sstabellini@...nel.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: "H. Peter Anvin" <hpa@...or.com>

Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>

with a small nit

>  void __init xen_init_spinlocks(void)
>  {
> +	if (nopvspin)
> +		xen_pvspin = false;
>  
>  	/*  Don't need to use pvqspinlock code if there is only 1 vCPU. */
>  	if (num_possible_cpus() == 1)

I'd fold the change into this 'if' statement, I think it will still be
clear what the comment refers to.

-boris