[PATCH 4/6] tools/sched_ext/include: Add __COMPAT_HAS_scx_bpf_select_cpu_and macro

[Tejun Heo <tj@kernel.org>]

scx_bpf_select_cpu_and() is now an inline wrapper so
bpf_ksym_exists(scx_bpf_select_cpu_and) no longer works. Add
__COMPAT_HAS_scx_bpf_select_cpu_and macro that checks for either the
struct args type (new) or the compat ksym (old) to test availability.

Signed-off-by: Tejun Heo <tj@kernel.org>
---
 tools/sched_ext/include/scx/compat.bpf.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/sched_ext/include/scx/compat.bpf.h b/tools/sched_ext/include/scx/compat.bpf.h
index 2d3985be7e2c..704728864d83 100644
--- a/tools/sched_ext/include/scx/compat.bpf.h
+++ b/tools/sched_ext/include/scx/compat.bpf.h
@@ -266,6 +266,14 @@ scx_bpf_select_cpu_and(struct task_struct *p, s32 prev_cpu, u64 wake_flags,
 	}
 }
 
+/*
+ * scx_bpf_select_cpu_and() is now an inline wrapper. Use this instead of
+ * bpf_ksym_exists(scx_bpf_select_cpu_and) to test availability.
+ */
+#define __COMPAT_HAS_scx_bpf_select_cpu_and				\
+	(bpf_core_type_exists(struct scx_bpf_select_cpu_and_args) ||	\
+	 bpf_ksym_exists(scx_bpf_select_cpu_and___compat))
+
 /**
  * scx_bpf_dsq_insert_vtime - Insert a task into the vtime priority queue of a DSQ
  * @p: task_struct to insert
-- 
2.53.0