[PATCH 1/3] KVM: cleanup (physical) CPU hotplug

[Paolo Bonzini]

Remove the useless argument, and do not do anything if there are no
VMs running at the time of the hotplug.

Cc: sta...@vger.kernel.org
Cc: kvm@vger.kernel.org
Cc: g...@redhat.com
Cc: jan.kis...@siemens.com
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
 virt/kvm/kvm_main.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 979bff4..75522b3 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2681,10 +2681,11 @@ static void hardware_enable_nolock(void *junk)
        }
 }
 
-static void hardware_enable(void *junk)
+static void hardware_enable(void)
 {
        raw_spin_lock(&kvm_lock);
-       hardware_enable_nolock(junk);
+       if (kvm_usage_count)
+               hardware_enable_nolock(NULL);
        raw_spin_unlock(&kvm_lock);
 }
 
@@ -2698,10 +2699,11 @@ static void hardware_disable_nolock(void *junk)
        kvm_arch_hardware_disable(NULL);
 }
 
-static void hardware_disable(void *junk)
+static void hardware_disable(void)
 {
        raw_spin_lock(&kvm_lock);
-       hardware_disable_nolock(junk);
+       if (kvm_usage_count)
+               hardware_disable_nolock(NULL);
        raw_spin_unlock(&kvm_lock);
 }
 
@@ -2756,12 +2758,12 @@ static int kvm_cpu_hotplug(struct notifier_block 
*notifier, unsigned long val,
        case CPU_DYING:
                printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
                       cpu);
-               hardware_disable(NULL);
+               hardware_disable();
                break;
        case CPU_STARTING:
                printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
                       cpu);
-               hardware_enable(NULL);
+               hardware_enable();
                break;
        }
        return NOTIFY_OK;
-- 
1.8.3.1


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