linux-kernel - Re: [PATCH bpf-next v4 03/12] bpf: selftests: Fix fentry test kfunc prototypes

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Date: Mon, 10 Jun 2024 15:28:36 +0200
From: Jiri Olsa <olsajiri@...il.com>
To: Daniel Xu <dxu@...uu.xyz>
Cc: shuah@...nel.org, daniel@...earbox.net, andrii@...nel.org,
	eddyz87@...il.com, ast@...nel.org, olsajiri@...il.com,
	quentin@...valent.com, alan.maguire@...cle.com, acme@...nel.org,
	martin.lau@...ux.dev, song@...nel.org, yonghong.song@...ux.dev,
	john.fastabend@...il.com, kpsingh@...nel.org, sdf@...gle.com,
	haoluo@...gle.com, mykolal@...com, bpf@...r.kernel.org,
	linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-team@...a.com
Subject: Re: [PATCH bpf-next v4 03/12] bpf: selftests: Fix fentry test kfunc
 prototypes

On Sat, Jun 08, 2024 at 03:15:59PM -0600, Daniel Xu wrote:
> The prototypes in progs/get_func_ip_test.c were not in line with how the
> actual kfuncs are defined in net/bpf/test_run.c. This causes compilation
> errors when kfunc prototypes are generated from BTF.
> 
> Fix by aligning with actual kfunc definitions.
> 
> Signed-off-by: Daniel Xu <dxu@...uu.xyz>
> ---
>  .../testing/selftests/bpf/progs/get_func_ip_test.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/tools/testing/selftests/bpf/progs/get_func_ip_test.c b/tools/testing/selftests/bpf/progs/get_func_ip_test.c
> index 8956eb78a226..a89596f7585d 100644
> --- a/tools/testing/selftests/bpf/progs/get_func_ip_test.c
> +++ b/tools/testing/selftests/bpf/progs/get_func_ip_test.c
> @@ -5,13 +5,13 @@
>  
>  char _license[] SEC("license") = "GPL";
>  
> -extern const void bpf_fentry_test1 __ksym;
> -extern const void bpf_fentry_test2 __ksym;
> -extern const void bpf_fentry_test3 __ksym;
> -extern const void bpf_fentry_test4 __ksym;
> -extern const void bpf_modify_return_test __ksym;
> -extern const void bpf_fentry_test6 __ksym;
> -extern const void bpf_fentry_test7 __ksym;
> +extern int bpf_fentry_test1(int a) __ksym;

hum, the only registered one as kfunc is bpf_fentry_test1, to allow fmodret
also there's bpf_fentry_test9 as kfunc, which AFAICS is not really needed

jirka

[1] 5b481acab4ce bpf: do not rely on ALLOW_ERROR_INJECTION for fmod_ret

> +extern int bpf_fentry_test2(int a, __u64 b) __ksym;
> +extern int bpf_fentry_test3(char a, int b, __u64 c) __ksym;
> +extern int bpf_fentry_test4(void *a, char b, int c, __u64 d) __ksym;
> +extern int bpf_modify_return_test(int a, int *b) __ksym;
> +extern int bpf_fentry_test6(__u64 a, void *b, short c, int d, void *e, __u64 f) __ksym;
> +extern int bpf_fentry_test7(struct bpf_fentry_test_t *arg) __ksym;
>  
>  extern bool CONFIG_X86_KERNEL_IBT __kconfig __weak;
>  
> -- 
> 2.44.0
>