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Subject: Re: [PATCH v3 3/4] xen: Mark "xen_nopvspin" parameter obsolete and
 map it to "nopvspin"
To:     Sean Christopherson <sean.j.christopherson@intel.com>
Cc:     linux-kernel@vger.kernel.org, vkuznets@redhat.com,
        linux-hyperv@vger.kernel.org, kvm@vger.kernel.org,
        Jonathan Corbet <corbet@lwn.net>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Juergen Gross <jgross@suse.com>,
        Stefano Stabellini <sstabellini@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        "H. Peter Anvin" <hpa@zytor.com>
References: <1569847479-13201-1-git-send-email-zhenzhong.duan@oracle.com>
 <1569847479-13201-4-git-send-email-zhenzhong.duan@oracle.com>
 <20191002171805.GD9615@linux.intel.com>
From:   Zhenzhong Duan <zhenzhong.duan@oracle.com>
Organization: Oracle Corporation
Message-ID: <cbfb13ec-bd0c-d9df-e61e-8a08f2c9f526@oracle.com>
Date:   Thu, 3 Oct 2019 19:21:11 +0800
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On 2019/10/3 1:18, Sean Christopherson wrote:
> On Mon, Sep 30, 2019 at 08:44:38PM +0800, Zhenzhong Duan wrote:
>> Fix stale description of "xen_nopvspin" as we use qspinlock now.
>>
>> Signed-off-by: Zhenzhong Duan<zhenzhong.duan@oracle.com>
>> Reviewed-by: Juergen Gross<jgross@suse.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>
>> ---
...snip
>> @@ -93,7 +92,7 @@ void xen_init_lock_cpu(int cpu)
>>   
>>   void xen_uninit_lock_cpu(int cpu)
>>   {
>> -	if (!xen_pvspin)
>> +	if (!pvspin)
>>   		return;
>>   
>>   	unbind_from_irqhandler(per_cpu(lock_kicker_irq, cpu), NULL);
>> @@ -117,9 +116,9 @@ void __init xen_init_spinlocks(void)
>>   
>>   	/*  Don't need to use pvqspinlock code if there is only 1 vCPU. */
>>   	if (num_possible_cpus() == 1)
>> -		xen_pvspin = false;
>> +		pvspin = false;
> As suggested in the other patch, if you incorporate pvspin (or nopvspin)
> into xen_pvspin then the param can be __initdata and the diff for this
> patch will be smaller, e.g. you wouldn't need the xen_domain() shenanigans
> in xen_parse_nopvspin().

Ok, will fix. Thanks

Zhenzhong