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authorMichael S. Tsirkin <mst@redhat.com>2019-06-06 17:17:36 -0400
committerMichael S. Tsirkin <mst@redhat.com>2019-06-06 17:32:13 -0400
commit0b4a7092ffe568a55bf8f3cefdf79ff666586d91 (patch)
tree47fbd372259265d0d17999e50735b2dfc6d559c9 /drivers/vhost/vhost.h
parent7f466032dc9e5a61217f22ea34b2df932786bbfc (diff)
downloadlinux-0b4a7092ffe568a55bf8f3cefdf79ff666586d91.tar.bz2
vhost: fix clang build warning
Clang warns: drivers/vhost/vhost.c:2085:5: warning: macro expansion producing 'defined' has undefined behavior [-Wexpansion-to-defined] #if VHOST_ARCH_CAN_ACCEL_UACCESS ^ drivers/vhost/vhost.h:98:38: note: expanded from macro 'VHOST_ARCH_CAN_ACCEL_UACCESS' #define VHOST_ARCH_CAN_ACCEL_UACCESS defined(CONFIG_MMU_NOTIFIER) && \ ^ It's being pedantic for the sake of portability, but the fix is easy enough. Rework the definition of VHOST_ARCH_CAN_ACCEL_UACCESS to expand to a constant. Fixes: 7f466032dc9e ("vhost: access vq metadata through kernel virtual address") Link: https://github.com/ClangBuiltLinux/linux/issues/508 Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Nathan Chancellor <natechancellor@gmail.com> Tested-by: Nathan Chancellor <natechancellor@gmail.com>
Diffstat (limited to 'drivers/vhost/vhost.h')
-rw-r--r--drivers/vhost/vhost.h7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index c5d950cf7627..819296332913 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -95,8 +95,11 @@ struct vhost_uaddr {
bool write;
};
-#define VHOST_ARCH_CAN_ACCEL_UACCESS defined(CONFIG_MMU_NOTIFIER) && \
- ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 0
+#if defined(CONFIG_MMU_NOTIFIER) && ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 0
+#define VHOST_ARCH_CAN_ACCEL_UACCESS 1
+#else
+#define VHOST_ARCH_CAN_ACCEL_UACCESS 0
+#endif
/* The virtqueue structure describes a queue attached to a device. */
struct vhost_virtqueue {