[FreeBSD] Improve upper_32_bits define.

Thanks to airlied.

diff --git a/bsd-core/drmP.h b/bsd-core/drmP.h
index 2f2ffb3c629edda3146954ab3e3c40c166aa8470..6b91a76b88c67553d2c200e0917d33c622da9a8e 100644 (file)
--- a/bsd-core/drmP.h
+++ b/bsd-core/drmP.h
@@ -632,7 +632,7 @@ struct drm_ati_pcigart_info {
 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : (1ULL<<(n)) - 1)
 #endif
 
-#define upper_32_bits(_val) (((u64)(_val)) >> 32)
+#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
 
 struct drm_driver_info {
        int     (*load)(struct drm_device *, unsigned long flags);