Em Sat, Aug 01, 2020 at 06:32:16PM -0700, Andrii Nakryiko escreveu:
> It's pretty common for applications to want to parse raw (binary) BTF data
> from file, as opposed to parsing it from ELF sections. It's also pretty common
> for tools to not care whether given file is ELF or raw BTF format. This patch
> series exposes internal raw BTF parsing API and adds generic variant of BTF
> parsing, which will efficiently determine the format of a given fail and will
> parse BTF appropriately.
>
> Patches #2 and #3 removes re-implementations of such APIs from bpftool and
> resolve_btfids tools.
>
> Andrii Nakryiko (3):
> libbpf: add btf__parse_raw() and generic btf__parse() APIs
> tools/bpftool: use libbpf's btf__parse() API for parsing BTF from file
> tools/resolve_btfids: use libbpf's btf__parse() API
I haven't checked which of the patches, or some in other series caused
this on Clear Linux:
21 clearlinux:latest : FAIL gcc (Clear Linux OS for Intel Architecture) 10.2.1 20200723 releases/gcc-10.2.0-3-g677b80db41, clang ver
sion 10.0.1
gcc (Clear Linux OS for Intel Architecture) 10.2.1 20200723 releases/gcc-10.2.0-3-g677b80db41
btf.c: In function 'btf__parse_raw':
btf.c:625:28: error: 'btf' may be used uninitialized in this function [-Werror=maybe-uninitialized]
625 | return err ? ERR_PTR(err) : btf;
| ~~~~~~~~~~~~~~~~~~~^~~~~
This is what I have:
[acme@quaco perf]$ git log -10 --oneline tools/lib/bpf
94a1fedd63ed libbpf: Add btf__parse_raw() and generic btf__parse() APIs
2e49527e5248 libbpf: Add bpf_link detach APIs
1acf8f90ea7e libbpf: Fix register in PT_REGS MIPS macros
50450fc716c1 libbpf: Make destructors more robust by handling ERR_PTR(err) cases
dc8698cac7aa libbpf: Add support for BPF XDP link
d4b4dd6ce770 libbpf: Print hint when PERF_EVENT_IOC_SET_BPF returns -EPROTO
cd31039a7347 tools/libbpf: Add support for bpf map element iterator
da7a35062bcc libbpf bpf_helpers: Use __builtin_offsetof for offsetof
499dd29d90bb libbpf: Add support for SK_LOOKUP program type
4be556cf5aef libbpf: Add SEC name for xdp programs attached to CPUMAP
[acme@quaco perf]$
> tools/bpf/bpftool/btf.c | 54 +------------
> tools/bpf/resolve_btfids/.gitignore | 4 +
> tools/bpf/resolve_btfids/main.c | 58 +-------------
> tools/lib/bpf/btf.c | 114 +++++++++++++++++++---------
> tools/lib/bpf/btf.h | 5 +-
> tools/lib/bpf/libbpf.map | 2 +
> 6 files changed, 89 insertions(+), 148 deletions(-)
> create mode 100644 tools/bpf/resolve_btfids/.gitignore
>
> --
> 2.24.1
>
--
- Arnaldo
