Commit 7980ad7e authored by Andrea Righi's avatar Andrea Righi Committed by Tejun Heo
Browse files

selftests/sched_ext: Fix exit selftest hang on UP 



On single-CPU systems, ops.select_cpu() is never called, causing the
EXIT_SELECT_CPU test case to wait indefinitely.

Avoid the stall by skipping this specific sub-test when only one CPU is
available.

Reported-by: default avatarPhil Auld <pauld@redhat.com>
Fixes: a5db7817 ("sched_ext: Add selftests")
Signed-off-by: default avatarAndrea Righi <arighi@nvidia.com>
Reviewed-by: default avatarPhil Auld <pauld@redhat.com>
Tested-by: default avatarPhil Auld <pauld@redhat.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 33796b91

tools/testing/selftests/sched_ext/exit.c

+8 −0
Original line number Diff line number Diff line
@@ -22,6 +22,14 @@ static enum scx_test_status run(void *ctx) 
		struct bpf_link *link;

		char buf[16];



		/*

		 * On single-CPU systems, ops.select_cpu() is never

		 * invoked, so skip this test to avoid getting stuck

		 * indefinitely.

		 */

		if (tc == EXIT_SELECT_CPU && libbpf_num_possible_cpus() == 1)

			continue;



		skel = exit__open();

		SCX_ENUM_INIT(skel);

		skel->rodata->exit_point = tc;