diff --git a/sys/compat/linuxkpi/common/include/linux/pwm.h b/sys/compat/linuxkpi/common/include/linux/pwm.h
--- a/sys/compat/linuxkpi/common/include/linux/pwm.h
+++ b/sys/compat/linuxkpi/common/include/linux/pwm.h
@@ -91,4 +91,10 @@
 	return (-ENOTSUPP);
 }
 
+static inline int
+pwm_apply_might_sleep(struct pwm_device *pwm, const struct pwm_state *state)
+{
+	return (0);
+}
+
 #endif	/* _LINUXKPI_LINUX_PWM_H_ */