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libbpf: Improve debug message when the base BTF cannot be found

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When running `bpftool` on a kernel module installed in `/lib/modules...`,
this error is encountered if the user does not specify `--base-btf` to
point to a valid base BTF (e.g. usually in `/sys/kernel/btf/vmlinux`).
However, looking at the debug output to determine the cause of the error
simply says `Invalid BTF string section`, which does not point to the
actual source of the error. This just improves that debug message to tell
users what happened.

Signed-off-by: Ben Olson <matthew.olson@intel.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/Z0YqzQ5lNz7obQG7@bolson-desk
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Ben Olson 2024-11-26 14:08:45 -06:00 committed by Alexei Starovoitov
parent adf120e1be
commit 9a17db586d
1 changed files with 1 additions and 1 deletions
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2
tools/lib/bpf/btf.c
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@ -283,7 +283,7 @@ static int btf_parse_str_sec(struct btf *btf)
return -EINVAL;
}
if (!btf->base_btf && start[0]) {
pr_debug("Invalid BTF string section\n");
pr_debug("Malformed BTF string section, did you forget to provide base BTF?\n");
return -EINVAL;
}
return 0;