SYNC_WALKER      1113 drivers/gpu/drm/radeon/evergreend.h #define		SYNC_WALKER					(1 << 25)
SYNC_WALKER       519 drivers/gpu/drm/radeon/r600d.h #define		SYNC_WALKER					(1 << 25)
SYNC_WALKER       603 drivers/gpu/drm/radeon/rv770d.h #define		SYNC_WALKER					(1 << 25)