[PATCH 2/5] KVM: MMU: use 16 bits for root_count

[Avi Kivity <avi@redhat.com>]

This is incremented by a maximum of 4 for every vcpu, so we are far from
overflow.  16 bits improve struct packing.

Signed-off-by: Avi Kivity <avi@redhat.com>
---
 arch/x86/include/asm/kvm_host.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index cdaaedc..f38007d 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -192,7 +192,7 @@ struct kvm_mmu_page {
 	 */
 	gfn_t gfn;
 	union kvm_mmu_page_role role;
-	int root_count;           /* Currently serving as active root */
+	short root_count;         /* Currently serving as active root */
 	bool multimapped;         /* More than one parent_pte? */
 	bool unsync;
 	union {
-- 
1.7.0.4