driver_allows_async_probing is only used in drivers/base/dd.c, so mark
it static and remove the declaration in drivers/base/base.h.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/base/base.h | 1 -
 drivers/base/dd.c   | 2 +-
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/base/base.h b/drivers/base/base.h
index b902d1ecc247f..7d4803c03d3e6 100644
--- a/drivers/base/base.h
+++ b/drivers/base/base.h
@@ -146,7 +146,6 @@ static inline int driver_match_device(struct device_driver *drv,
 {
 	return drv->bus->match ? drv->bus->match(dev, drv) : 1;
 }
-extern bool driver_allows_async_probing(struct device_driver *drv);
 
 extern int driver_add_groups(struct device_driver *drv,
 			     const struct attribute_group **groups);
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 3dda62503102f..4001e22617ab0 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -843,7 +843,7 @@ static int __init save_async_options(char *buf)
 }
 __setup("driver_async_probe=", save_async_options);
 
-bool driver_allows_async_probing(struct device_driver *drv)
+static bool driver_allows_async_probing(struct device_driver *drv)
 {
 	switch (drv->probe_type) {
 	case PROBE_PREFER_ASYNCHRONOUS:
-- 
2.30.2