Re: [PATCH] selftests/sched_ext: Include common.bpf.h to avoid build failure

[Cheng-Yang Chou]

Hi Zhao,

On Thu, Apr 23, 2026 at 06:42:35PM +0800, Zhao Mengmeng wrote:
> From: Zhao Mengmeng <zhaomengmeng@xxxxxxxxxx>
> 
> In scx-cid patchsets, sched_ext selftest failed to build with following
> error:
> 
> non_scx_kfunc_deny.bpf.c:17:6: error: conflicting types for 'scx_bpf_kick_cpu'
> 17 | void scx_bpf_kick_cpu(s32 cpu, u64 flags) __ksym;
> |      ^
> tools/testing/selftests/sched_ext/build/include/vmlinux.h:136300:13: note: previous declaration is here
> 136300 | extern void scx_bpf_kick_cpu(s32 cpu, u64 flags, const struct bpf_prog_aux *aux) __weak __ksym;
> |             ^
> non_scx_kfunc_deny.bpf.c:26:23: error: too few arguments to function call, expected 3, have 2
> 26 |         scx_bpf_kick_cpu(0, 0);
> |         ~~~~~~~~~~~~~~~~     ^
> tools/testing/selftests/sched_ext/build/include/vmlinux.h:136300:13: note: 'scx_bpf_kick_cpu' declared here
> 136300 | extern void scx_bpf_kick_cpu(s32 cpu, u64 flags, const struct bpf_prog_aux *aux) __weak __ksym;
> 
> The root cause is on scx core part, but we can avoid this by including
> common.bpf.h and remove scx_bpf_kick_cpu() to make it more robust, just
> like the usage in other xx.bpf.c.
> 
> Link: https://lore.kernel.org/sched-ext/20260421071945.3110084-1-tj@xxxxxxxxxx/
> Signed-off-by: Zhao Mengmeng <zhaomengmeng@xxxxxxxxxx>
> Tested-by: Cheng-Yang Chou <yphbchou0911@xxxxxxxxx>

Thanks for the fix, LGTM!

> ---
>  tools/testing/selftests/sched_ext/non_scx_kfunc_deny.bpf.c | 7 +------
>  1 file changed, 1 insertion(+), 6 deletions(-)
> 
> diff --git a/tools/testing/selftests/sched_ext/non_scx_kfunc_deny.bpf.c b/tools/testing/selftests/sched_ext/non_scx_kfunc_deny.bpf.c
> index 9f16d39255e7..0d6fcc8e5eb6 100644
> --- a/tools/testing/selftests/sched_ext/non_scx_kfunc_deny.bpf.c
> +++ b/tools/testing/selftests/sched_ext/non_scx_kfunc_deny.bpf.c
> @@ -9,12 +9,7 @@
>   * Copyright (C) 2026 Cheng-Yang Chou <yphbchou0911@xxxxxxxxx>
>   */
>  
> -#include <vmlinux.h>
> -#include <bpf/bpf_helpers.h>
> -#include <bpf/bpf_tracing.h>
> -
> -/* SCX kfunc from scx_kfunc_ids_any set */
> -void scx_bpf_kick_cpu(s32 cpu, u64 flags) __ksym;
> +#include <scx/common.bpf.h>
>  
>  SEC("struct_ops/ssthresh")
>  __u32 BPF_PROG(tcp_ca_ssthresh, struct sock *sk)
> 
> ---
> base-commit: eff158514a85c1b81966667a880dd8bcd29bbbd1
> change-id: 20260423-b4-selftest-fix-d87cdda6185e
> 
> Best regards,
> --  
> Zhao Mengmeng <zhaomengmeng@xxxxxxxxxx>
> 

-- 
Cheers,
Cheng-Yang