6.15-stable review patch. If anyone has any objections, please let me know.
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From: Andrea Righi arighi@nvidia.com
[ Upstream commit 7980ad7e4ca80f6c255f4473fba82a475342035a ]
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: Phil Auld pauld@redhat.com Fixes: a5db7817af780 ("sched_ext: Add selftests") Signed-off-by: Andrea Righi arighi@nvidia.com Reviewed-by: Phil Auld pauld@redhat.com Tested-by: Phil Auld pauld@redhat.com Signed-off-by: Tejun Heo tj@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- tools/testing/selftests/sched_ext/exit.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/tools/testing/selftests/sched_ext/exit.c b/tools/testing/selftests/sched_ext/exit.c index 9451782689de1..ee25824b1cbe6 100644 --- a/tools/testing/selftests/sched_ext/exit.c +++ b/tools/testing/selftests/sched_ext/exit.c @@ -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;