Raspberry Pi GPIO driver removed the mutex lock to improve performance.
The gpio_devices_lock is no longer used by default, so conditionally
compile out the lock definition when REJECT_HOTPLUG_TAX is defined to
eliminate the build warning:
warning: 'gpio_devices_lock' defined but not used [-Wunused-variable]
Fixes: 8faa733240c1 ("gpiolib: Avoid the hotplug performance reduction")
Signed-off-by: Jianpeng Chang <[email protected]>
---
drivers/gpio/gpiolib.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index fe01d258d61d..2f88491e4183 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -122,7 +122,9 @@ static LIST_HEAD(gpio_lookup_list);
static LIST_HEAD(gpio_devices);
/* Protects the GPIO device list against concurrent modifications. */
+#ifndef REJECT_HOTPLUG_TAX
static DEFINE_MUTEX(gpio_devices_lock);
+#endif
/* Ensures coherence during read-only accesses to the list of GPIO devices. */
DEFINE_STATIC_SRCU(gpio_devices_srcu);
--
2.51.2
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