arm/arm64: KVM: Clean up useless code in kvm_timer_enable

1) Since commit:41a54482 changed timer enabled variable to per-vcpu,
   the correlative comment in kvm_timer_enable is useless now.

2) After the kvm module init successfully, the timecounter is always
   non-null, so we can remove the checking of timercounter.

Signed-off-by: Longpeng(Mike) <longpeng2@huawei.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c
index 27a1f63..17b8fa5 100644 (file)
--- a/virt/kvm/arm/arch_timer.c
+++ b/virt/kvm/arm/arch_timer.c
@@ -498,17 +498,7 @@ int kvm_timer_enable(struct kvm_vcpu *vcpu)
        if (ret)
                return ret;
 
-
-       /*
-        * There is a potential race here between VCPUs starting for the first
-        * time, which may be enabling the timer multiple times.  That doesn't
-        * hurt though, because we're just setting a variable to the same
-        * variable that it already was.  The important thing is that all
-        * VCPUs have the enabled variable set, before entering the guest, if
-        * the arch timers are enabled.
-        */
-       if (timecounter)
-               timer->enabled = 1;
+       timer->enabled = 1;
 
        return 0;
 }