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bpf: update bpf_{g,s}et_retval documentation

* replace 'syscall' with 'upper layers', still mention that it's being exported via syscall errno * describe what happens in set_retval(-EPERM) + return 1 * describe what happens with bind's 'return 3' Acked-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: Stanislav Fomichev <sdf@google.com> Link: https://lore.kernel.org/r/20220823222555.523590-5-sdf@google.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>

Author Stanislav Fomichev Committer Alexei Starovoitov Date Commit Parent 8a67f2de
+34 -10
2 changed files
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+34 -10
2 changed files