From: Avi Kivity <avi@redhat.com>
Date: Tue, 21 Sep 2010 17:59:44 +0000 (+0200)
Subject: KVM: cpu_relax() during spin waiting for reboot
X-Git-Tag: v3.12-rc1~8394^2~22
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=624d84cfe63b5afdd087bf5b2075a8a8cac5c83f;p=kernel%2Fkernel-generic.git

KVM: cpu_relax() during spin waiting for reboot

It doesn't really matter, but if we spin, we should spin in a more relaxed
manner.  This way, if something goes wrong at least it won't contribute to
global warming.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
---

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index c7a57b4..b8499f5 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2022,7 +2022,7 @@ asmlinkage void kvm_handle_fault_on_reboot(void)
 		/* spin while reset goes on */
 		local_irq_enable();
 		while (true)
-			;
+			cpu_relax();
 	}
 	/* Fault while not rebooting.  We want the trace. */
 	BUG();