Without it, the build system complains that it was declared inside the parameter list. Fixes the following W=1 kernel build warning(s): In file included from drivers/usb/mtu3/mtu3_trace.c:11: drivers/usb/mtu3/mtu3_debug.h:29:36: warning: ‘struct ssusb_mtk’ declared inside parameter list will not be visible outside of this definition or declaration 29 | void ssusb_dev_debugfs_init(struct ssusb_mtk *ssusb); | ^~~~~~~~~ drivers/usb/mtu3/mtu3_debug.h:30:35: warning: ‘struct ssusb_mtk’ declared inside parameter list will not be visible outside of this definition or declaration 30 | void ssusb_dr_debugfs_init(struct ssusb_mtk *ssusb); | ^~~~~~~~~ drivers/usb/mtu3/mtu3_debug.h:31:39: warning: ‘struct ssusb_mtk’ declared inside parameter list will not be visible outside of this definition or declaration 31 | void ssusb_debugfs_create_root(struct ssusb_mtk *ssusb); | ^~~~~~~~~ drivers/usb/mtu3/mtu3_debug.h:32:39: warning: ‘struct ssusb_mtk’ declared inside parameter list will not be visible outside of this definition or declaration 32 | void ssusb_debugfs_remove_root(struct ssusb_mtk *ssusb); | ^~~~~~~~~ Cc: Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx> Cc: linux-mediatek@xxxxxxxxxxxxxxxxxxx Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx> --- drivers/usb/mtu3/mtu3_debug.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/usb/mtu3/mtu3_debug.h b/drivers/usb/mtu3/mtu3_debug.h index fb6b28277c9b1..3084c46017c37 100644 --- a/drivers/usb/mtu3/mtu3_debug.h +++ b/drivers/usb/mtu3/mtu3_debug.h @@ -12,6 +12,8 @@ #include <linux/debugfs.h> +struct ssusb_mtk; + #define MTU3_DEBUGFS_NAME_LEN 32 struct mtu3_regset { -- 2.25.1