For inline function in header file, better to be "static inline", or may
cause building break under the latest upstream gcc (although, probably,
it should be the gcc's issue).

The related error (with allmodconfig under tile):

    MODPOST 4002 modules
  ERROR: "lifebook_detect" [drivers/input/mouse/psmouse.ko] undefined!

Signed-off-by: Chen Gang <redacted>
---
 drivers/input/mouse/lifebook.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/input/mouse/lifebook.h b/drivers/input/mouse/lifebook.h
index 4c4326c..0baf02a 100644
--- a/drivers/input/mouse/lifebook.h
+++ b/drivers/input/mouse/lifebook.h

@@ -16,14 +16,14 @@ void lifebook_module_init(void);
 int lifebook_detect(struct psmouse *psmouse, bool set_properties);
 int lifebook_init(struct psmouse *psmouse);
 #else
-inline void lifebook_module_init(void)
+static inline void lifebook_module_init(void)
 {
 }
-inline int lifebook_detect(struct psmouse *psmouse, bool set_properties)
+static inline int lifebook_detect(struct psmouse *psmouse, bool set_properties)
 {
 	return -ENOSYS;
 }
-inline int lifebook_init(struct psmouse *psmouse)
+static inline int lifebook_init(struct psmouse *psmouse)
 {
 	return -ENOSYS;
 }