linux-kernel - Re: [PATCH bpf-next v5 2/4] selftests/bpf: remove reduplicated s32 casting in "crafted

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Date: Tue, 19 Dec 2023 10:40:04 -0800
From: Andrii Nakryiko <andrii.nakryiko@...il.com>
To: Menglong Dong <menglong8.dong@...il.com>
Cc: andrii@...nel.org, eddyz87@...il.com, yonghong.song@...ux.dev, 
	alexei.starovoitov@...il.com, ast@...nel.org, daniel@...earbox.net, 
	john.fastabend@...il.com, martin.lau@...ux.dev, song@...nel.org, 
	kpsingh@...nel.org, sdf@...gle.com, haoluo@...gle.com, jolsa@...nel.org, 
	mykolal@...com, shuah@...nel.org, bpf@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf-next v5 2/4] selftests/bpf: remove reduplicated s32
 casting in "crafted_cases"

On Tue, Dec 19, 2023 at 5:50 AM Menglong Dong <menglong8.dong@...il.com> wrote:
>
> The "S32_MIN" is already defined with s32 casting, so there is no need
> to do it again.
>
> Signed-off-by: Menglong Dong <menglong8.dong@...il.com>
> ---
>  tools/testing/selftests/bpf/prog_tests/reg_bounds.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>

Acked-by: Andrii Nakryiko <andrii@...nel.org>

> diff --git a/tools/testing/selftests/bpf/prog_tests/reg_bounds.c b/tools/testing/selftests/bpf/prog_tests/reg_bounds.c
> index 0c9abd279e18..3bf4ddd720a8 100644
> --- a/tools/testing/selftests/bpf/prog_tests/reg_bounds.c
> +++ b/tools/testing/selftests/bpf/prog_tests/reg_bounds.c
> @@ -2097,10 +2097,10 @@ static struct subtest_case crafted_cases[] = {
>
>         {U32, S32, {0, U32_MAX}, {U32_MAX, U32_MAX}},
>
> -       {S32, U64, {(u32)(s32)S32_MIN, (u32)(s32)S32_MIN}, {(u32)(s32)-255, 0}},
> -       {S32, S64, {(u32)(s32)S32_MIN, (u32)(s32)-255}, {(u32)(s32)-2, 0}},
> -       {S32, S64, {0, 1}, {(u32)(s32)S32_MIN, (u32)(s32)S32_MIN}},
> -       {S32, U32, {(u32)(s32)S32_MIN, (u32)(s32)S32_MIN}, {(u32)(s32)S32_MIN, (u32)(s32)S32_MIN}},
> +       {S32, U64, {(u32)S32_MIN, (u32)S32_MIN}, {(u32)(s32)-255, 0}},
> +       {S32, S64, {(u32)S32_MIN, (u32)(s32)-255}, {(u32)(s32)-2, 0}},
> +       {S32, S64, {0, 1}, {(u32)S32_MIN, (u32)S32_MIN}},
> +       {S32, U32, {(u32)S32_MIN, (u32)S32_MIN}, {(u32)S32_MIN, (u32)S32_MIN}},
>  };
>
>  /* Go over crafted hard-coded cases. This is fast, so we do it as part of
> --
> 2.39.2
>