diff mbox series

[-next,2/2] selftests: Fix fscanf warning

Message ID 20210709063741.355325-2-chenlifu@huawei.com (mailing list archive)
State New, archived
Headers show
Series [-next,1/2] selftests: Fix vm_handle_exception undefined error | expand

Commit Message

chenlifu July 9, 2021, 6:37 a.m. UTC 
Compile selftests occurs the following warnings:
make -C tools/testing/selftests
...

lib/test_util.c: In function ‘get_trans_hugepagesz’:
lib/test_util.c:138:2: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result]
  138 |  fscanf(f, "%ld", &size);
      |  ^~~~~~~~~~~~~~~~~~~~~~~
x86_64/mmio_warning_test.c: In function ‘get_warnings_count’:
x86_64/mmio_warning_test.c:85:2: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result]
   85 |  fscanf(f, "%d", &warnings);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~
x86_64/xen_shinfo_test.c: In function ‘get_run_delay’:
x86_64/xen_shinfo_test.c:109:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result]
  109 |         fscanf(fp, "%ld %ld ", &val[0], &val[1]);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
steal_time.c: In function ‘get_run_delay’:
steal_time.c:228:2: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result]
  228 |  fscanf(fp, "%ld %ld ", &val[0], &val[1]);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Check the return value of ‘fscanf’ to fix it.

Signed-off-by: Chen Lifu <chenlifu@huawei.com>
---
 tools/testing/selftests/kvm/lib/test_util.c            | 3 ++-
 tools/testing/selftests/kvm/steal_time.c               | 3 ++-
 tools/testing/selftests/kvm/x86_64/mmio_warning_test.c | 3 ++-
 tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c   | 3 ++-
 4 files changed, 8 insertions(+), 4 deletions(-)

Comments

chenlifu Aug. 13, 2021, 7:27 a.m. UTC | #1 
在 2021/7/9 14:37, Chen Lifu 写道:
> Compile selftests occurs the following warnings:
> make -C tools/testing/selftests
> ...
> 
> lib/test_util.c: In function ‘get_trans_hugepagesz’:
> lib/test_util.c:138:2: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result]
>    138 |  fscanf(f, "%ld", &size);
>        |  ^~~~~~~~~~~~~~~~~~~~~~~
> x86_64/mmio_warning_test.c: In function ‘get_warnings_count’:
> x86_64/mmio_warning_test.c:85:2: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result]
>     85 |  fscanf(f, "%d", &warnings);
>        |  ^~~~~~~~~~~~~~~~~~~~~~~~~~
> x86_64/xen_shinfo_test.c: In function ‘get_run_delay’:
> x86_64/xen_shinfo_test.c:109:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result]
>    109 |         fscanf(fp, "%ld %ld ", &val[0], &val[1]);
>        |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> steal_time.c: In function ‘get_run_delay’:
> steal_time.c:228:2: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result]
>    228 |  fscanf(fp, "%ld %ld ", &val[0], &val[1]);
>        |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Check the return value of ‘fscanf’ to fix it.
> 
> Signed-off-by: Chen Lifu <chenlifu@huawei.com>
> ---
>   tools/testing/selftests/kvm/lib/test_util.c            | 3 ++-
>   tools/testing/selftests/kvm/steal_time.c               | 3 ++-
>   tools/testing/selftests/kvm/x86_64/mmio_warning_test.c | 3 ++-
>   tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c   | 3 ++-
>   4 files changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/testing/selftests/kvm/lib/test_util.c b/tools/testing/selftests/kvm/lib/test_util.c
> index af1031fed97f..02ed0d5c3aa5 100644
> --- a/tools/testing/selftests/kvm/lib/test_util.c
> +++ b/tools/testing/selftests/kvm/lib/test_util.c
> @@ -135,7 +135,8 @@ size_t get_trans_hugepagesz(void)
>   	f = fopen("/sys/kernel/mm/transparent_hugepage/hpage_pmd_size", "r");
>   	TEST_ASSERT(f != NULL, "Error in opening transparent_hugepage/hpage_pmd_size");
>   
> -	fscanf(f, "%ld", &size);
> +	if (fscanf(f, "%ld", &size) != 1)
> +		size = 0;
>   	fclose(f);
>   
>   	return size;
> diff --git a/tools/testing/selftests/kvm/steal_time.c b/tools/testing/selftests/kvm/steal_time.c
> index b0031f2d38fd..18f231c45a12 100644
> --- a/tools/testing/selftests/kvm/steal_time.c
> +++ b/tools/testing/selftests/kvm/steal_time.c
> @@ -225,7 +225,8 @@ static long get_run_delay(void)
>   
>   	sprintf(path, "/proc/%ld/schedstat", syscall(SYS_gettid));
>   	fp = fopen(path, "r");
> -	fscanf(fp, "%ld %ld ", &val[0], &val[1]);
> +	if (fscanf(fp, "%ld %ld ", &val[0], &val[1]) != 2)
> +		val[1] = 0;
>   	fclose(fp);
>   
>   	return val[1];
> diff --git a/tools/testing/selftests/kvm/x86_64/mmio_warning_test.c b/tools/testing/selftests/kvm/x86_64/mmio_warning_test.c
> index e6480fd5c4bd..e770037e5cc9 100644
> --- a/tools/testing/selftests/kvm/x86_64/mmio_warning_test.c
> +++ b/tools/testing/selftests/kvm/x86_64/mmio_warning_test.c
> @@ -82,7 +82,8 @@ int get_warnings_count(void)
>   	FILE *f;
>   
>   	f = popen("dmesg | grep \"WARNING:\" | wc -l", "r");
> -	fscanf(f, "%d", &warnings);
> +	if (fscanf(f, "%d", &warnings) != 1)
> +		warnings = 0;
>   	fclose(f);
>   
>   	return warnings;
> diff --git a/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c b/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c
> index 117bf49a3d79..6efda86083f1 100644
> --- a/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c
> +++ b/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c
> @@ -106,7 +106,8 @@ static long get_run_delay(void)
>   
>           sprintf(path, "/proc/%ld/schedstat", syscall(SYS_gettid));
>           fp = fopen(path, "r");
> -        fscanf(fp, "%ld %ld ", &val[0], &val[1]);
> +	if (fscanf(fp, "%ld %ld ", &val[0], &val[1]) != 2)
> +		val[1] = 0;
>           fclose(fp);
>   
>           return val[1];
>
diff mbox series

Patch

diff --git a/tools/testing/selftests/kvm/lib/test_util.c b/tools/testing/selftests/kvm/lib/test_util.c
index af1031fed97f..02ed0d5c3aa5 100644
--- a/tools/testing/selftests/kvm/lib/test_util.c
+++ b/tools/testing/selftests/kvm/lib/test_util.c
@@ -135,7 +135,8 @@  size_t get_trans_hugepagesz(void)
 	f = fopen("/sys/kernel/mm/transparent_hugepage/hpage_pmd_size", "r");
 	TEST_ASSERT(f != NULL, "Error in opening transparent_hugepage/hpage_pmd_size");
 
-	fscanf(f, "%ld", &size);
+	if (fscanf(f, "%ld", &size) != 1)
+		size = 0;
 	fclose(f);
 
 	return size;
diff --git a/tools/testing/selftests/kvm/steal_time.c b/tools/testing/selftests/kvm/steal_time.c
index b0031f2d38fd..18f231c45a12 100644
--- a/tools/testing/selftests/kvm/steal_time.c
+++ b/tools/testing/selftests/kvm/steal_time.c
@@ -225,7 +225,8 @@  static long get_run_delay(void)
 
 	sprintf(path, "/proc/%ld/schedstat", syscall(SYS_gettid));
 	fp = fopen(path, "r");
-	fscanf(fp, "%ld %ld ", &val[0], &val[1]);
+	if (fscanf(fp, "%ld %ld ", &val[0], &val[1]) != 2)
+		val[1] = 0;
 	fclose(fp);
 
 	return val[1];
diff --git a/tools/testing/selftests/kvm/x86_64/mmio_warning_test.c b/tools/testing/selftests/kvm/x86_64/mmio_warning_test.c
index e6480fd5c4bd..e770037e5cc9 100644
--- a/tools/testing/selftests/kvm/x86_64/mmio_warning_test.c
+++ b/tools/testing/selftests/kvm/x86_64/mmio_warning_test.c
@@ -82,7 +82,8 @@  int get_warnings_count(void)
 	FILE *f;
 
 	f = popen("dmesg | grep \"WARNING:\" | wc -l", "r");
-	fscanf(f, "%d", &warnings);
+	if (fscanf(f, "%d", &warnings) != 1)
+		warnings = 0;
 	fclose(f);
 
 	return warnings;
diff --git a/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c b/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c
index 117bf49a3d79..6efda86083f1 100644
--- a/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c
+++ b/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c
@@ -106,7 +106,8 @@  static long get_run_delay(void)
 
         sprintf(path, "/proc/%ld/schedstat", syscall(SYS_gettid));
         fp = fopen(path, "r");
-        fscanf(fp, "%ld %ld ", &val[0], &val[1]);
+	if (fscanf(fp, "%ld %ld ", &val[0], &val[1]) != 2)
+		val[1] = 0;
         fclose(fp);
 
         return val[1];