diff --git a/net/lwip-2.1/enhancement/src/api_shell.c b/net/lwip-2.1/enhancement/src/api_shell.c
index 5c56d3652ea03825a15a05262284439787c2b328..4d2487cb0926694b2fcd89df44b71e3f54758747 100644
--- a/net/lwip-2.1/enhancement/src/api_shell.c
+++ b/net/lwip-2.1/enhancement/src/api_shell.c
@@ -356,7 +356,7 @@ int print_netif(struct netif *netif, char *print_buf, unsigned int buf_len)
         buf_len -= (unsigned int)ret;
     }
 
-    ret = snprintf_s(tmp, buf_len, (buf_len - 1), " %s\n", 
+    ret = snprintf_s(tmp, buf_len, (buf_len - 1), " %s\n",
                      (netif->flags & NETIF_FLAG_LINK_UP) ? "Link UP" : "Link Down");
     if ((ret <= 0) || ((unsigned int)ret >= buf_len))
         goto out;
diff --git a/testsuites/unittest/basic/mem/shm/full/shm_test_002.cpp b/testsuites/unittest/basic/mem/shm/full/shm_test_002.cpp
index 7740e7581a0e6ae2724c6b0913447cdd2fc0c7da..d605e033956b2a49bba6ac8585d0aec365db1791 100644
--- a/testsuites/unittest/basic/mem/shm/full/shm_test_002.cpp
+++ b/testsuites/unittest/basic/mem/shm/full/shm_test_002.cpp
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
- * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
+ * Copyright (c) 2020-2022 Huawei Device Co., Ltd. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without modification,
  * are permitted provided that the following conditions are met:
@@ -31,6 +31,7 @@
 #include "it_test_shm.h"
 
 #define SHMID_MAX 192
+#define SHM_FLAG 0777
 
 static int Testcase(VOID)
 {
@@ -44,24 +45,24 @@ static int Testcase(VOID)
     ICUNIT_ASSERT_EQUAL(ret, SHMID_MAX, ret);
     leftShmIds = SHMID_MAX - shmInfo.used_ids;
 
-    shmid[0] = shmget((key_t)0x1234, PAGE_SIZE, 0777 | IPC_CREAT);
+    shmid[0] = shmget((key_t)0x1234, PAGE_SIZE, SHM_FLAG | IPC_CREAT); // 0x1234: a key used to create shared memory
     ICUNIT_ASSERT_NOT_EQUAL(shmid[0], -1, shmid[0]);
 
     ret = shmctl(shmid[0], IPC_RMID, NULL);
     ICUNIT_ASSERT_EQUAL(ret, 0, ret);
 
-    shmid[0] = shmget(IPC_PRIVATE, PAGE_SIZE, 0777 | IPC_CREAT);
+    shmid[0] = shmget(IPC_PRIVATE, PAGE_SIZE, SHM_FLAG | IPC_CREAT);
     ICUNIT_ASSERT_NOT_EQUAL(shmid[0], -1, shmid[0]);
 
     ret = shmctl(shmid[0], IPC_RMID, NULL);
     ICUNIT_ASSERT_EQUAL(ret, 0, ret);
 
     for (i = 0; i < leftShmIds; i++) {
-        shmid[i] = shmget(IPC_PRIVATE, PAGE_SIZE, 0777 | IPC_CREAT);
+        shmid[i] = shmget(IPC_PRIVATE, PAGE_SIZE, SHM_FLAG | IPC_CREAT);
         ICUNIT_ASSERT_NOT_EQUAL(shmid[i], -1, shmid[i]);
     }
 
-    shmid[leftShmIds] = shmget(IPC_PRIVATE, PAGE_SIZE, 0777 | IPC_CREAT);
+    shmid[leftShmIds] = shmget(IPC_PRIVATE, PAGE_SIZE, SHM_FLAG | IPC_CREAT);
     ICUNIT_ASSERT_EQUAL(shmid[leftShmIds], -1, shmid[leftShmIds]);
 
     for (i = 0; i < leftShmIds; i++) {
diff --git a/testsuites/unittest/libc/time/clock/lt_clock_test.h b/testsuites/unittest/libc/time/clock/lt_clock_test.h
index ac34a0dd1b73e660147ca8d50e5cc138c2800131..9819361c792ddb3d26b649df82fe631ae1ef2d5b 100644
--- a/testsuites/unittest/libc/time/clock/lt_clock_test.h
+++ b/testsuites/unittest/libc/time/clock/lt_clock_test.h
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
- * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
+ * Copyright (c) 2020-2022 Huawei Device Co., Ltd. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without modification,
  * are permitted provided that the following conditions are met:
@@ -41,7 +41,7 @@
 #define CLOCK_RES_NSEC 1000
 #define CLOCK_COARSE_RES_SEC 0
 #define CLOCK_COARSE_RES_NSEC 1000000
-#define CLOCK_GET_CPU_CLOCKID(pid) ((-pid - 1) * 8U + 2)
+#define CLOCK_GET_CPU_CLOCKID(pid) ((-(pid) - 1) * 8U + 2)
 
 void ClockTestSmoke(void);
 void ClockTest001(void);