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A number of test cases for BPF selftests test_verifier to check how bpf_loop inline transformation rewrites the BPF program. The following cases are covered: - happy path - no-rewrite when flags is non-zero - no-rewrite when callback is non-constant - subprogno in insn_aux is updated correctly when dead sub-programs are removed - check that correct stack offsets are assigned for spilling of R6-R8 registers Signed-off-by: Eduard Zingerman <eddyz87@gmail.com> Acked-by: Song Liu <songliubraving@fb.com> Link: https://lore.kernel.org/r/20220620235344.569325-5-eddyz87@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>