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Commit 7103f60d authored by Christian Borntraeger's avatar Christian Borntraeger Committed by Paolo Bonzini
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KVM: avoid unnecessary synchronize_rcu 



We dont have to wait for a grace period if there is no oldpid that
we are going to free. putpid also checks for NULL, so this patch
only fences synchronize_rcu.

Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent e0ad0b47

virt/kvm/kvm_main.c

+2 −1
Original line number Diff line number Diff line
@@ -129,6 +129,7 @@ int vcpu_load(struct kvm_vcpu *vcpu) 
		struct pid *oldpid = vcpu->pid;

		struct pid *newpid = get_task_pid(current, PIDTYPE_PID);

		rcu_assign_pointer(vcpu->pid, newpid);

		if (oldpid)

			synchronize_rcu();

		put_pid(oldpid);

	}