linux-kernel - Re: [PATCH 6/5] KVM: x86: fix periodic lapic timer with hrtimers

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Date:   Wed, 26 Oct 2016 13:15:42 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Wanpeng Li <kernellwp@...il.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        kvm <kvm@...r.kernel.org>,
        Yunhong Jiang <yunhong.jiang@...el.com>,
        Wanpeng Li <wanpeng.li@...mail.com>
Subject: Re: [PATCH 6/5] KVM: x86: fix periodic lapic timer with hrtimers



On 26/10/2016 12:23, Wanpeng Li wrote:
>> >
>> >         if (apic_lvtt_oneshot(apic) &&
>> > -           ktime_after(apic->lapic_timer.target_expiration,
>> > -                       apic->lapic_timer.timer.base->get_time())) {
>> > +           !ktime_after(apic->lapic_timer.target_expiration,
>> > +                        apic->lapic_timer.timer.base->get_time())) {
>> >                 apic_timer_expired(apic);
>> >                 return;
>> >         }
>> >
>> > Paolo, can you squash that?
> It seems that squash is impossible since the dependency of current
> kvm/queue(KVM: x86: use ktime_get instead of seeking the
> hrtimer_clock_base), I will send out a separate patch to fix this.

It is squashed in:

+	if (apic_lvtt_oneshot(apic) &&
+	    ktime_after(apic->lapic_timer.timer.base->get_time(),
+			apic->lapic_timer.target_expiration)) {
+		apic_timer_expired(apic);
+		return;
+	}

Notice that the order of the arguments is inverted (alternatively I
could have used ktime_before).

Paolo