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charset="utf-8" Extend SCX_OPS_OPEN() with compatibility handling for ops.sub_attach() and ops.sub_detach(), allowing scx C schedulers with sub-scheduler support to run on kernels both with and without its support. Cc: Cheng-Yang Chou Fixes: ebeca1f930ea ("sched_ext: Introduce cgroup sub-sched support") Signed-off-by: Andrea Righi Reviewed-by: Cheng-Yang Chou --- Changes in v2: - Handle sub_cgroup_id in older kernels (Cheng-Yang Chou) - Link to v1: https://lore.kernel.org/all/20260321102036.58734-1-arighi@nv= idia.com tools/sched_ext/include/scx/compat.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/tools/sched_ext/include/scx/compat.h b/tools/sched_ext/include= /scx/compat.h index 9e0c8f3161e87..039854c490d5e 100644 --- a/tools/sched_ext/include/scx/compat.h +++ b/tools/sched_ext/include/scx/compat.h @@ -160,6 +160,7 @@ static inline long scx_hotplug_seq(void) * COMPAT: * - v6.17: ops.cgroup_set_bandwidth() * - v6.19: ops.cgroup_set_idle() + * - v7.1: ops.sub_attach(), ops.sub_detach(), ops.sub_cgroup_id */ #define SCX_OPS_OPEN(__ops_name, __scx_name) ({ \ struct __scx_name *__skel; \ @@ -181,6 +182,21 @@ static inline long scx_hotplug_seq(void) fprintf(stderr, "WARNING: kernel doesn't support ops.cgroup_set_idle()\n= "); \ __skel->struct_ops.__ops_name->cgroup_set_idle =3D NULL; \ } \ + if (__skel->struct_ops.__ops_name->sub_attach && \ + !__COMPAT_struct_has_field("sched_ext_ops", "sub_attach")) { \ + fprintf(stderr, "WARNING: kernel doesn't support ops.sub_attach()\n"); \ + __skel->struct_ops.__ops_name->sub_attach =3D NULL; \ + } \ + if (__skel->struct_ops.__ops_name->sub_detach && \ + !__COMPAT_struct_has_field("sched_ext_ops", "sub_detach")) { \ + fprintf(stderr, "WARNING: kernel doesn't support ops.sub_detach()\n"); \ + __skel->struct_ops.__ops_name->sub_detach =3D NULL; \ + } \ + if (__skel->struct_ops.__ops_name->sub_cgroup_id > 0 && \ + !__COMPAT_struct_has_field("sched_ext_ops", "sub_cgroup_id")) { \ + fprintf(stderr, "WARNING: kernel doesn't support ops.sub_cgroup_id\n"); \ + __skel->struct_ops.__ops_name->sub_cgroup_id =3D 0; \ + } \ __skel; \ }) =20 --=20 2.53.0