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

[Zhao Mengmeng]

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>
---
 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>