diff --git a/arch/arm/src/stm32/stm32_rtcc.c b/arch/arm/src/stm32/stm32_rtcc.c
index f3dc454881b..3c5eae20b1c 100644
--- a/arch/arm/src/stm32/stm32_rtcc.c
+++ b/arch/arm/src/stm32/stm32_rtcc.c
@@ -484,6 +484,7 @@ static int rtc_setup(void)
 
       rtc_wprlock();
     }
+
   return ret;
 }
 
@@ -526,6 +527,7 @@ static int rtc_resume(void)
 
   putreg32((1 << 17), STM32_EXTI_PR);
 #endif
+
   return ret;
 }
 
diff --git a/drivers/usbhost/usbhost_enumerate.c b/drivers/usbhost/usbhost_enumerate.c
index d8bcc9c024a..97f9ac9ef81 100644
--- a/drivers/usbhost/usbhost_enumerate.c
+++ b/drivers/usbhost/usbhost_enumerate.c
@@ -424,7 +424,7 @@ int usbhost_enumerate(FAR struct usbhost_driver_s *drvr, uint8_t funcaddr,
 
   /* Get class identification information from the device descriptor.  Most
    * devices set this to USB_CLASS_PER_INTERFACE (zero) and provide the
-   * identification informatino in the interface descriptor(s).  That allows
+   * identification information in the interface descriptor(s).  That allows
    * a device to support multiple, different classes.
    */
 
diff --git a/include/nuttx/usb/usbhost.h b/include/nuttx/usb/usbhost.h
index d96a55d9a8d..b0133ca1358 100644
--- a/include/nuttx/usb/usbhost.h
+++ b/include/nuttx/usb/usbhost.h
@@ -563,7 +563,7 @@ struct usbhost_registry_s
    */
 
   FAR struct usbhost_class_s     *(*create)(FAR struct usbhost_driver_s *drvr,
-                                           FAR const struct usbhost_id_s *id);
+                                            FAR const struct usbhost_id_s *id);
 
   /* This information uniquely identifies the USB host class implementation that
    * goes with a specific USB device.
diff --git a/mm/mm_sem.c b/mm/mm_sem.c
index f986e9923ac..e72f7d79634 100644
--- a/mm/mm_sem.c
+++ b/mm/mm_sem.c
@@ -211,7 +211,10 @@ void mm_givesemaphore(FAR struct mm_heap_s *heap)
     {
       /* Nope, this is the last reference I have */
 
+#ifdef CONFIG_DEBUG
       msemdbg("PID=%d giving\n", my_pid);
+#endif
+
       heap->mm_holder      = -1;
       heap->mm_counts_held = 0;
       ASSERT(sem_post(&heap->mm_semaphore) == 0);