[PATCH] ARM(64): KVM: add signed type cast for comparation

[Chen Gang]

'len' is 'unsigned long' which is never less than zero.

So need a related type cast for comparation.

The related warning (when building ARM64 with allmodconfig):

  arch/arm64/kvm/../../../arch/arm/kvm/mmio.c:82:2: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]


Signed-off-by: Chen Gang <gang.chen at asianux.com>
---
 arch/arm/kvm/mmio.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/arm/kvm/mmio.c b/arch/arm/kvm/mmio.c
index b8e06b7..626dfc8 100644
--- a/arch/arm/kvm/mmio.c
+++ b/arch/arm/kvm/mmio.c
@@ -79,7 +79,7 @@ static int decode_hsr(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
 	}
 
 	len = kvm_vcpu_dabt_get_as(vcpu);
-	if (unlikely(len < 0))
+	if (unlikely((long)len < 0))
 		return len;
 
 	is_write = kvm_vcpu_dabt_iswrite(vcpu);
-- 
1.7.7.6