diff --git a/components/backtrace/los_backtrace.c b/components/backtrace/los_backtrace.c
index 649da6da..41d0d81d 100644
--- a/components/backtrace/los_backtrace.c
+++ b/components/backtrace/los_backtrace.c
@@ -241,7 +241,7 @@ VOID LOS_RecordLR(UINTPTR *LR, UINT32 LRSize, UINT32 jumpCount, UINTPTR SP)
 STATIC INLINE BOOL OsInsIsJump(UINTPTR addr)
 {
     UINT16 ins1 = *((UINT16 *)addr);
-    UINT16 ins2 = *((UINT16 *)(addr + 2));
+    UINT16 ins2 = *((UINT16 *)(addr + 2)); // 2, for the mask
 
     /* Jal ins */
     if (((ins1 & OS_JALX_INS_MASK) == OS_JAL_INS_LOW) ||
diff --git a/kal/cmsis/cmsis_liteos2.c b/kal/cmsis/cmsis_liteos2.c
index 2f3d7346..2b5eebc4 100644
--- a/kal/cmsis/cmsis_liteos2.c
+++ b/kal/cmsis/cmsis_liteos2.c
@@ -258,7 +258,7 @@ uint32_t osKernelGetTickFreq(void)
 
 uint32_t osKernelGetSysTimerCount(void)
 {
-    uint32_t countLow = 0;
+    uint32_t countLow;
     if (OS_INT_ACTIVE) {
         countLow = 0U;
     } else {
diff --git a/kernel/src/los_sem.c b/kernel/src/los_sem.c
index 685256ce..13e0fb6c 100644
--- a/kernel/src/los_sem.c
+++ b/kernel/src/los_sem.c
@@ -30,7 +30,6 @@
  */
 
 #include "los_sem.h"
-#include "los_arch.h"
 #include "los_config.h"
 #include "los_debug.h"
 #include "los_hook.h"