diff --git a/configs/bambino-200e/src/lpc43_appinit.c b/configs/bambino-200e/src/lpc43_appinit.c
index f69023a4fe..785c28758b 100644
--- a/configs/bambino-200e/src/lpc43_appinit.c
+++ b/configs/bambino-200e/src/lpc43_appinit.c
@@ -164,7 +164,7 @@ int board_app_initialize(uintptr_t arg)
 {
   /* Initialize the SPIFI block device */
 
-  nsh_spifi_initialize();
+  (void)nsh_spifi_initialize();
 
 #ifdef CONFIG_TIMER
   /* Registers the timers */
diff --git a/configs/mikroe-stm32f4/src/stm32_pwm.c b/configs/mikroe-stm32f4/src/stm32_pwm.c
index a4bb122a45..bad3819dd0 100644
--- a/configs/mikroe-stm32f4/src/stm32_pwm.c
+++ b/configs/mikroe-stm32f4/src/stm32_pwm.c
@@ -85,8 +85,6 @@
 #  undef HAVE_PWM
 #endif
 
-#ifdef HAVE_PWM
-
 /************************************************************************************
  * Public Functions
  ************************************************************************************/
@@ -101,6 +99,7 @@
 
 int stm32_pwm_setup(void)
 {
+#ifdef HAVE_PWM
   static bool initialized = false;
   struct pwm_lowerhalf_s *pwm;
   int ret;
@@ -133,6 +132,8 @@ int stm32_pwm_setup(void)
     }
 
   return OK;
+#else
+  return -ENOSYS;
+#endif
 }
 
-#endif /* HAVE_PWM */
diff --git a/configs/stm32f103-minimum/src/stm32_pwm.c b/configs/stm32f103-minimum/src/stm32_pwm.c
index c3e64baf7b..8f7e99f839 100644
--- a/configs/stm32f103-minimum/src/stm32_pwm.c
+++ b/configs/stm32f103-minimum/src/stm32_pwm.c
@@ -85,8 +85,6 @@
 #  undef HAVE_PWM
 #endif
 
-#ifdef HAVE_PWM
-
 /************************************************************************************
  * Public Functions
  ************************************************************************************/
@@ -101,6 +99,7 @@
 
 int stm32_pwm_setup(void)
 {
+#ifdef HAVE_PWM
   static bool initialized = false;
   struct pwm_lowerhalf_s *pwm;
   int ret;
@@ -133,6 +132,8 @@ int stm32_pwm_setup(void)
     }
 
   return OK;
+#else
+  return -ENOSYS;
+#endif
 }
 
-#endif /* HAVE_PWM */
diff --git a/configs/stm32f3discovery/src/stm32_pwm.c b/configs/stm32f3discovery/src/stm32_pwm.c
index e31a2e62fc..5eb075c51d 100644
--- a/configs/stm32f3discovery/src/stm32_pwm.c
+++ b/configs/stm32f3discovery/src/stm32_pwm.c
@@ -85,8 +85,6 @@
 #  undef HAVE_PWM
 #endif
 
-#ifdef HAVE_PWM
-
 /************************************************************************************
  * Public Functions
  ************************************************************************************/
@@ -101,6 +99,7 @@
 
 int stm32_pwm_setup(void)
 {
+#ifdef HAVE_PWM
   static bool initialized = false;
   struct pwm_lowerhalf_s *pwm;
   int ret;
@@ -133,6 +132,8 @@ int stm32_pwm_setup(void)
     }
 
   return OK;
+#else
+  return -ENOSYS;
+#endif
 }
 
-#endif /* HAVE_PWM */
diff --git a/configs/stm32f4discovery/src/stm32_pwm.c b/configs/stm32f4discovery/src/stm32_pwm.c
index e8565b8fd0..0eaefc9371 100644
--- a/configs/stm32f4discovery/src/stm32_pwm.c
+++ b/configs/stm32f4discovery/src/stm32_pwm.c
@@ -83,8 +83,6 @@
 #  undef HAVE_PWM
 #endif
 
-#ifdef HAVE_PWM
-
 /************************************************************************************
  * Public Functions
  ************************************************************************************/
@@ -99,6 +97,7 @@
 
 int stm32_pwm_setup(void)
 {
+#ifdef HAVE_PWM
   static bool initialized = false;
   struct pwm_lowerhalf_s *pwm;
   int ret;
@@ -131,6 +130,7 @@ int stm32_pwm_setup(void)
     }
 
   return OK;
+#else
+  return -ENOSYS;
+#endif
 }
-
-#endif /* HAVE_PWM */
diff --git a/configs/stm32ldiscovery/src/stm32_pwm.c b/configs/stm32ldiscovery/src/stm32_pwm.c
index 6e2753cf9d..3409fccc8e 100644
--- a/configs/stm32ldiscovery/src/stm32_pwm.c
+++ b/configs/stm32ldiscovery/src/stm32_pwm.c
@@ -85,8 +85,6 @@
 #  undef HAVE_PWM
 #endif
 
-#ifdef HAVE_PWM
-
 /************************************************************************************
  * Public Functions
  ************************************************************************************/
@@ -101,6 +99,7 @@
 
 int stm32_pwm_setup(void)
 {
+#ifdef HAVE_PWM
   static bool initialized = false;
   struct pwm_lowerhalf_s *pwm;
   int ret;
@@ -133,6 +132,8 @@ int stm32_pwm_setup(void)
     }
 
   return OK;
+#else
+  return -ENOSYS;
+#endif
 }
 
-#endif /* HAVE_PWM */