From mboxrd@z Thu Jan  1 00:00:00 1970
From: Radim Krcmar <rkrcmar@redhat.com>
Subject: Re: [patch 5/5] PTP: add kvm PTP driver
Date: Fri, 20 Jan 2017 15:20:30 +0100
Message-ID: <20170120142030.GB1365@potion>
References: <20170120122025.665985919@redhat.com>
 <20170120122503.842086637@redhat.com>
 <20170120141255.GA1365@potion>
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Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
        Paolo Bonzini <pbonzini@redhat.com>,
        Richard Cochran <richardcochran@gmail.com>,
        Miroslav Lichvar <mlichvar@redhat.com>
To: Marcelo Tosatti <mtosatti@redhat.com>
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2017-01-20 15:12+0100, Radim Krcmar:
> 2017-01-20 10:20-0200, Marcelo Tosatti:
>> +	spin_lock(&kvm_ptp_lock);
> 
> What does the lock prevent?

clock_off/clock_off_gpa. :)