Patch "Use WARN_ON_ONCE for missing X86_FEATURE_NRIPS" has been added to the 3.10-stable tree

This is a note to let you know that I've just added the patch titled

Use WARN_ON_ONCE for missing X86_FEATURE_NRIPS

to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
use-warn_on_once-for-missing-x86_feature_nrips.patch
and it can be found in the queue-3.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: =?UTF-8?q?Dirk=20M=C3=BCller?= <[email protected]>
Date: Thu, 1 Oct 2015 13:43:42 +0200
Subject: Use WARN_ON_ONCE for missing X86_FEATURE_NRIPS

From: =?UTF-8?q?Dirk=20M=C3=BCller?= <[email protected]>

commit d2922422c48df93f3edff7d872ee4f3191fefb08 upstream.

The cpu feature flags are not ever going to change, so warning everytime can cause a lot of kernel log spam
(in our case more than 10GB/hour).

The warning seems to only occur when nested virtualization is enabled, so it's probably triggered by a KVM bug. This is a sensible and safe change anyway, and the KVM bug fix might not be suitable for stable releases anyway.

---
 arch/x86/kvm/svm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -496,7 +496,7 @@ static void skip_emulated_instruction(st
 	struct vcpu_svm *svm = to_svm(vcpu);
 
 	if (svm->vmcb->control.next_rip != 0) {
-		WARN_ON(!static_cpu_has(X86_FEATURE_NRIPS));
+		WARN_ON_ONCE(!static_cpu_has(X86_FEATURE_NRIPS));
 		svm->next_rip = svm->vmcb->control.next_rip;
 	}
 

Patches currently in stable-queue which might be from [email protected] are

queue-3.10/use-warn_on_once-for-missing-x86_feature_nrips.patch