* [PATCH] Fix application of sizeof to pointer
@ 2021-10-12 3:01 davidcomponentone
2021-10-12 7:01 ` David Hildenbrand
0 siblings, 1 reply; 2+ messages in thread
From: davidcomponentone @ 2021-10-12 3:01 UTC (permalink / raw)
To: akpm
Cc: shuah, linux-mm, linux-kselftest, linux-kernel, David Yang, Zeal Robot
From: David Yang <davidcomponentone@gmail.com>
The coccinelle check report:
"./tools/testing/selftests/vm/split_huge_page_test.c:344:36-42:
ERROR: application of sizeof to pointer"
Using the "strlen" to fix it.
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: David Yang <davidcomponentone@gmail.com>
---
tools/testing/selftests/vm/split_huge_page_test.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/testing/selftests/vm/split_huge_page_test.c b/tools/testing/selftests/vm/split_huge_page_test.c
index 1af16d2c2a0a..52497b7b9f1d 100644
--- a/tools/testing/selftests/vm/split_huge_page_test.c
+++ b/tools/testing/selftests/vm/split_huge_page_test.c
@@ -341,7 +341,7 @@ void split_file_backed_thp(void)
}
/* write something to the file, so a file-backed THP can be allocated */
- num_written = write(fd, tmpfs_loc, sizeof(tmpfs_loc));
+ num_written = write(fd, tmpfs_loc, strlen(tmpfs_loc) + 1);
close(fd);
if (num_written < 1) {
--
2.30.2
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [PATCH] Fix application of sizeof to pointer
2021-10-12 3:01 [PATCH] Fix application of sizeof to pointer davidcomponentone
@ 2021-10-12 7:01 ` David Hildenbrand
0 siblings, 0 replies; 2+ messages in thread
From: David Hildenbrand @ 2021-10-12 7:01 UTC (permalink / raw)
To: davidcomponentone, akpm
Cc: shuah, linux-mm, linux-kselftest, linux-kernel, Zeal Robot
On 12.10.21 05:01, davidcomponentone@gmail.com wrote:
> From: David Yang <davidcomponentone@gmail.com>
>
> The coccinelle check report:
> "./tools/testing/selftests/vm/split_huge_page_test.c:344:36-42:
> ERROR: application of sizeof to pointer"
> Using the "strlen" to fix it.
>
> Reported-by: Zeal Robot <zealci@zte.com.cn>
> Signed-off-by: David Yang <davidcomponentone@gmail.com>
> ---
> tools/testing/selftests/vm/split_huge_page_test.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/vm/split_huge_page_test.c b/tools/testing/selftests/vm/split_huge_page_test.c
> index 1af16d2c2a0a..52497b7b9f1d 100644
> --- a/tools/testing/selftests/vm/split_huge_page_test.c
> +++ b/tools/testing/selftests/vm/split_huge_page_test.c
> @@ -341,7 +341,7 @@ void split_file_backed_thp(void)
> }
>
> /* write something to the file, so a file-backed THP can be allocated */
> - num_written = write(fd, tmpfs_loc, sizeof(tmpfs_loc));
> + num_written = write(fd, tmpfs_loc, strlen(tmpfs_loc) + 1);
> close(fd);
>
> if (num_written < 1) {
>
I think the code really just wants to write anything to the file that
will be >= 1, which is also the case with this weird usage of sizeof.
As an alternative, I think we can just write anything else to the file
num_written = write(fd, (void *)&fd, sizeof(fd));
or
num_written = write(fd, "1", 1);
If I am not wrong/
--
Thanks,
David / dhildenb
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2021-10-12 3:01 [PATCH] Fix application of sizeof to pointer davidcomponentone
2021-10-12 7:01 ` David Hildenbrand
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