[PATCH] KVM: arm64: fix compile error because of shift overflow

From: Yang Yingliang
Date: Tue Aug 09 2022 - 05:33:38 EST


Change the mask to unsigned to fix the following fix compile error
because of shift overflow when using low verison gcc(mine version is 7.5):

In function ‘kvm_vm_ioctl_set_device_addr.isra.38’,
inlined from ‘kvm_arch_vm_ioctl’ at arch/arm64/kvm/arm.c:1454:10:
././include/linux/compiler_types.h:354:38: error: call to ‘__compiletime_assert_599’ \
declared with attribute error: FIELD_GET: mask is not constant
_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)

Fixes: 9f968c9266aa ("KVM: arm64: vgic-v2: Add helper for legacy dist/cpuif base address setting")
Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
---
arch/arm64/include/uapi/asm/kvm.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h
index 3bb134355874..04ffa13d5e0a 100644
--- a/arch/arm64/include/uapi/asm/kvm.h
+++ b/arch/arm64/include/uapi/asm/kvm.h
@@ -77,7 +77,7 @@ struct kvm_regs {
#define KVM_ARM_DEVICE_TYPE_SHIFT 0
#define KVM_ARM_DEVICE_TYPE_MASK (0xffff << KVM_ARM_DEVICE_TYPE_SHIFT)
#define KVM_ARM_DEVICE_ID_SHIFT 16
-#define KVM_ARM_DEVICE_ID_MASK (0xffff << KVM_ARM_DEVICE_ID_SHIFT)
+#define KVM_ARM_DEVICE_ID_MASK (0xffffu << KVM_ARM_DEVICE_ID_SHIFT)

/* Supported device IDs */
#define KVM_ARM_DEVICE_VGIC_V2 0
--
2.25.1