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exe_ctx test fails on s390, because get_preempt_count() is not implemented and its fallback path always returns 0. Implement it using the new bpf_get_lowcore() kfunc. Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Link: https://lore.kernel.org/r/20260217160813.100855-3-iii@linux.ibm.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>