libbpf: fix return value for PERF_EVENT __arg_ctx type fix up check
If PERF_EVENT program has __arg_ctx argument with matching architecture-specific pt_regs/user_pt_regs/user_regs_struct pointer type, libbpf should still perform type rewrite for old kernels, but not emit the warning. Fix copy/paste from kernel code where 0 is meant to signify "no error" condition. For libbpf we need to return "true" to proceed with type rewrite (which for PERF_EVENT program will be a canonical `struct bpf_perf_event_data *` type). Fixes: 9eea8fafe33e ("libbpf: fix __arg_ctx type enforcement for perf_event programs") Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/r/20240206002243.1439450-1-andrii@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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@ -6404,13 +6404,13 @@ static bool need_func_arg_type_fixup(const struct btf *btf, const struct bpf_pro
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case BPF_PROG_TYPE_PERF_EVENT:
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if (__builtin_types_compatible_p(bpf_user_pt_regs_t, struct pt_regs) &&
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btf_is_struct(t) && strcmp(tname, "pt_regs") == 0)
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return 0;
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return true;
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if (__builtin_types_compatible_p(bpf_user_pt_regs_t, struct user_pt_regs) &&
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btf_is_struct(t) && strcmp(tname, "user_pt_regs") == 0)
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return 0;
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return true;
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if (__builtin_types_compatible_p(bpf_user_pt_regs_t, struct user_regs_struct) &&
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btf_is_struct(t) && strcmp(tname, "user_regs_struct") == 0)
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return 0;
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return true;
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break;
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case BPF_PROG_TYPE_RAW_TRACEPOINT:
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case BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:
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