Commit 9a17db58 authored by Ben Olson's avatar Ben Olson Committed by Alexei Starovoitov
Browse files

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



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: default avatarBen Olson <matthew.olson@intel.com>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/Z0YqzQ5lNz7obQG7@bolson-desk


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent adf120e1

tools/lib/bpf/btf.c

+1 −1
Original line number Diff line number Diff line
@@ -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;