[v1] selftests/bpf: Use ARRAY_SIZE for array length

[PATCH] selftests/bpf: Use ARRAY_SIZE for array length

Posted by Jiapeng Chong 2 years ago

Use of macro ARRAY_SIZE to calculate array size minimizes
the redundant code and improves code reusability.

./tools/testing/selftests/bpf/progs/syscall.c:122:26-27: WARNING: Use ARRAY_SIZE.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=8170
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
---
 tools/testing/selftests/bpf/progs/syscall.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/progs/syscall.c b/tools/testing/selftests/bpf/progs/syscall.c
index 3d3cafdebe72..297a34f224c3 100644
--- a/tools/testing/selftests/bpf/progs/syscall.c
+++ b/tools/testing/selftests/bpf/progs/syscall.c
@@ -119,7 +119,7 @@ int load_prog(struct args *ctx)
 	static __u64 value = 34;
 	static union bpf_attr prog_load_attr = {
 		.prog_type = BPF_PROG_TYPE_XDP,
-		.insn_cnt = sizeof(insns) / sizeof(insns[0]),
+		.insn_cnt = ARRAY_SIZE(insns)
 	};
 	int ret;
 
-- 
2.20.1.7.g153144c

Re: [PATCH] selftests/bpf: Use ARRAY_SIZE for array length

Posted by Martin KaFai Lau 2 years ago

On 2/2/24 1:06 AM, Jiapeng Chong wrote:
> Use of macro ARRAY_SIZE to calculate array size minimizes
> the redundant code and improves code reusability.
> 
> ./tools/testing/selftests/bpf/progs/syscall.c:122:26-27: WARNING: Use ARRAY_SIZE.
> 
> Reported-by: Abaci Robot <abaci@linux.alibaba.com>
> Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=8170
> Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
> ---
>   tools/testing/selftests/bpf/progs/syscall.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/bpf/progs/syscall.c b/tools/testing/selftests/bpf/progs/syscall.c
> index 3d3cafdebe72..297a34f224c3 100644
> --- a/tools/testing/selftests/bpf/progs/syscall.c
> +++ b/tools/testing/selftests/bpf/progs/syscall.c
> @@ -119,7 +119,7 @@ int load_prog(struct args *ctx)
>   	static __u64 value = 34;
>   	static union bpf_attr prog_load_attr = {
>   		.prog_type = BPF_PROG_TYPE_XDP,
> -		.insn_cnt = sizeof(insns) / sizeof(insns[0]),
> +		.insn_cnt = ARRAY_SIZE(insns)

This does not even compile: 
https://github.com/kernel-patches/bpf/actions/runs/7761734279/job/21170796228

The existing code here is fine.

>   	};
>   	int ret;
>