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Subject: Re: [PATCH v4 3/4] xen: Mark "xen_nopvspin" parameter obsolete
To:     Zhenzhong Duan <zhenzhong.duan@oracle.com>,
        linux-kernel@vger.kernel.org
Cc:     vkuznets@redhat.com, linux-hyperv@vger.kernel.org,
        kvm@vger.kernel.org, kys@microsoft.com, haiyangz@microsoft.com,
        sthemmin@microsoft.com, sashal@kernel.org, tglx@linutronix.de,
        mingo@redhat.com, bp@alien8.de, pbonzini@redhat.com,
        rkrcmar@redhat.com, sean.j.christopherson@intel.com,
        wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org,
        jgross@suse.com, sstabellini@kernel.org, peterz@infradead.org,
        Jonathan Corbet <corbet@lwn.net>,
        "H. Peter Anvin" <hpa@zytor.com>
References: <1570111335-12731-1-git-send-email-zhenzhong.duan@oracle.com>
 <1570111335-12731-4-git-send-email-zhenzhong.duan@oracle.com>
From:   Boris Ostrovsky <boris.ostrovsky@oracle.com>
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Message-ID: <2c644c4a-f562-3271-ce0b-e60a44d82d89@oracle.com>
Date:   Fri, 4 Oct 2019 10:57:13 -0400
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Sender: linux-kernel-owner@vger.kernel.org
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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@oracle.com>
> Cc: Jonathan Corbet <corbet@lwn.net>
> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
> Cc: Juergen Gross <jgross@suse.com>
> Cc: Stefano Stabellini <sstabellini@kernel.org>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: Borislav Petkov <bp@alien8.de>
> Cc: "H. Peter Anvin" <hpa@zytor.com>

Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.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