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Add selftests for static subprog calls within bpf_spin_lock critical section, and ensure we still reject global subprog calls. Also test the case where a subprog call will unlock the caller's held lock, or the caller will unlock a lock taken by a subprog call, ensuring correct transfer of lock state across frames on exit. Acked-by: Yonghong Song <yonghong.song@linux.dev> Acked-by: David Vernet <void@manifault.com> Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Link: https://lore.kernel.org/r/20240204222349.938118-3-memxor@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>