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authorTobias Klauser <tklauser@distanz.ch>2020-05-25 16:54:21 +0300
committerAlexei Starovoitov <ast@kernel.org>2020-06-02 00:38:19 +0300
commitdc3ca5cf3e0be9fb73f4691247367d76a22bf30b (patch)
treed7393cd6ba68b08787e37d9414c32a9ce10fbdf4 /tools/bpf
parent73a4f0407e67cdfdf55dd94f573ed4ee2d0d62fe (diff)
downloadlinux-dc3ca5cf3e0be9fb73f4691247367d76a22bf30b.tar.xz
tools, bpftool: Print correct error message when failing to load BTF
btf__parse_raw and btf__parse_elf return negative error numbers wrapped in an ERR_PTR, so the extracted value needs to be negated before passing them to strerror which expects a positive error number. Before: Error: failed to load BTF from .../vmlinux: Unknown error -2 After: Error: failed to load BTF from .../vmlinux: No such file or directory Signed-off-by: Tobias Klauser <tklauser@distanz.ch> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20200525135421.4154-1-tklauser@distanz.ch Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'tools/bpf')
-rw-r--r--tools/bpf/bpftool/btf.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/bpf/bpftool/btf.c b/tools/bpf/bpftool/btf.c
index c134666591a6..faac8189b285 100644
--- a/tools/bpf/bpftool/btf.c
+++ b/tools/bpf/bpftool/btf.c
@@ -553,7 +553,7 @@ static int do_dump(int argc, char **argv)
btf = btf__parse_elf(*argv, NULL);
if (IS_ERR(btf)) {
- err = PTR_ERR(btf);
+ err = -PTR_ERR(btf);
btf = NULL;
p_err("failed to load BTF from %s: %s",
*argv, strerror(err));