Fresh users usually forget to turn on BTF generating flags compiling
kernels, and will receive a confusing error "No such file or directory"
(from return value ENOENT) with command "bpftool btf dump file vmlinux".
Hope this can help them find the mistake.
Signed-off-by: Tianyi Liu <i.pear@xxxxxxxxxxx>
---
tools/lib/bpf/btf.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index 2d14f1a52..9fbae1f3d 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -990,6 +990,8 @@ static struct btf *btf_parse_elf(const char *path, struct btf *base_btf,
err = 0;
if (!btf_data) {
+ pr_warn("Failed to get section %s from ELF %s, check CONFIG_DEBUG_INFO_BTF if compiling kernel\n",
+ BTF_ELF_SEC, path);
err = -ENOENT;
goto done;
}
--
2.37.3
