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Message-Id: <20221126111147.199366-2-changbin.du@gmail.com> Date: Sat, 26 Nov 2022 19:11:46 +0800 From: Changbin Du <changbin.du@...il.com> To: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>, Quentin Monnet <quentin@...valent.com>, Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, Shuah Khan <shuah@...nel.org> Cc: Martin KaFai Lau <martin.lau@...ux.dev>, Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>, John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>, bpf@...r.kernel.org, linux-kernel@...r.kernel.org, Mark Rutland <mark.rutland@....com>, Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Namhyung Kim <namhyung@...nel.org>, Mykola Lysenko <mykolal@...com>, linux-perf-users@...r.kernel.org, linux-kselftest@...r.kernel.org, Changbin Du <changbin.du@...il.com> Subject: [PATCH 1/2] libbpf: show more info about missing ".BTF" section Show more information about why failed instead of just saying "No such file or directory". Now will print below info: libbpf: can not find '.BTF' section libbpf: is CONFIG_DEBUG_INFO_BTF enabled for kernel? Error: failed to load BTF from /home/changbin/work/linux/vmlinux: No such file or directory Signed-off-by: Changbin Du <changbin.du@...il.com> --- tools/lib/bpf/btf.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c index d88647da2c7f..3f661d991808 100644 --- a/tools/lib/bpf/btf.c +++ b/tools/lib/bpf/btf.c @@ -906,6 +906,15 @@ struct btf *btf__new(const void *data, __u32 size) return libbpf_ptr(btf_new(data, size, NULL)); } +static bool is_vmlinux(const char *path) +{ + size_t path_len = strlen(path); + size_t suffix_len = strlen("vmlinux"); + + return (path_len >= suffix_len) && + (!memcmp(path + path_len - suffix_len, "vmlinux", suffix_len)); +} + static struct btf *btf_parse_elf(const char *path, struct btf *base_btf, struct btf_ext **btf_ext) { @@ -990,6 +999,9 @@ static struct btf *btf_parse_elf(const char *path, struct btf *base_btf, err = 0; if (!btf_data) { + pr_warn("can not find '%s' section\n", BTF_ELF_SEC); + if (is_vmlinux(path)) + pr_warn("is CONFIG_DEBUG_INFO_BTF enabled for kernel?\n"); err = -ENOENT; goto done; } -- 2.37.2
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