linux-kernel - Re: [PATCH v2 0/5] tools: fix compilation failure caused by init_disassemble

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Date:   Sun, 10 Jul 2022 19:52:36 +0200
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Andres Freund <andres@...razel.de>
Cc:     bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Quentin Monnet <quentin@...valent.com>
Subject: Re: [PATCH v2 0/5] tools: fix compilation failure caused by
 init_disassemble_info API changes

On Sun, Jul 10, 2022 at 1:43 PM Sedat Dilek <sedat.dilek@...il.com> wrote:
>
> On Sun, Jul 3, 2022 at 11:25 PM Andres Freund <andres@...razel.de> wrote:
> >
> > binutils changed the signature of init_disassemble_info(), which now causes
> > compilation failures for tools/{perf,bpf} on e.g. debian unstable. Relevant
> > binutils commit:
> > https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=60a3da00bd5407f07
> >
>
> HI,
>
> what was the base for this patchset?
> I tried with Linux v5.19-rc5 and it doesn not apply cleanly.
>

More coffee.

$ egrep 'Auto-detecting|disassembler' make-log_perf-python3.10-install_bin.txt
15:Auto-detecting system features:
36:...        disassembler-four-args: [ on  ]
37:...      disassembler-init-styled: [ on  ]

Tested-by: Sedat Dilek <sedat.dilek@...il.com> # LLVM-14 (x86-64)

-Sedat-

>
> > I first fixed this without introducing the compat header, as suggested by
> > Quentin, but I thought the amount of repeated boilerplate was a bit too
> > much. So instead I introduced a compat header to wrap the API changes. Even
> > tools/bpf/bpftool/jit_disasm.c, which needs its own callbacks for json, imo
> > looks nicer this way.
> >
> > I'm not regular contributor, so it very well might be my procedures are a
> > bit off...
> >
> > I am not sure I added the right [number of] people to CC?
> >
> > WRT the feature test: Not sure what the point of the -DPACKAGE='"perf"' is,
> > nor why tools/perf/Makefile.config sets some LDFLAGS/CFLAGS that are also
> > in feature/Makefile and why -ldl isn't needed in the other places. But...
> >
> > V2:
> > - split patches further, so that tools/bpf and tools/perf part are entirely
> >   separate
> > - included a bit more information about tests I did in commit messages
> > - add a maybe_unused to fprintf_json_styled's style argument
> >
> > Cc: Alexei Starovoitov <ast@...nel.org>
> > Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> > Cc: Jiri Olsa <jolsa@...nel.org>
> > Cc: Sedat Dilek <sedat.dilek@...il.com>
> > Cc: Quentin Monnet <quentin@...valent.com>
> > To: bpf@...r.kernel.org
> > To: linux-kernel@...r.kernel.org
> > Link: https://lore.kernel.org/lkml/20220622181918.ykrs5rsnmx3og4sv@alap3.anarazel.de
> > Link: https://lore.kernel.org/lkml/CA+icZUVpr8ZeOKCj4zMMqbFT013KJz2T1csvXg+VSkdvJH1Ubw@mail.gmail.com
> >
> > Andres Freund (5):
> >   tools build: add feature test for init_disassemble_info API changes
> >   tools include: add dis-asm-compat.h to handle version differences
> >   tools perf: Fix compilation error with new binutils
> >   tools bpf_jit_disasm: Fix compilation error with new binutils
> >   tools bpftool: Fix compilation error with new binutils
> >
> >  tools/bpf/Makefile                            |  7 ++-
> >  tools/bpf/bpf_jit_disasm.c                    |  5 +-
> >  tools/bpf/bpftool/Makefile                    |  7 ++-
> >  tools/bpf/bpftool/jit_disasm.c                | 42 ++++++++++++---
> >  tools/build/Makefile.feature                  |  4 +-
> >  tools/build/feature/Makefile                  |  4 ++
> >  tools/build/feature/test-all.c                |  4 ++
> >  .../feature/test-disassembler-init-styled.c   | 13 +++++
> >  tools/include/tools/dis-asm-compat.h          | 53 +++++++++++++++++++
> >  tools/perf/Makefile.config                    |  8 +++
> >  tools/perf/util/annotate.c                    |  7 +--
> >  11 files changed, 137 insertions(+), 17 deletions(-)
> >  create mode 100644 tools/build/feature/test-disassembler-init-styled.c
> >  create mode 100644 tools/include/tools/dis-asm-compat.h
> >
> > --
> > 2.37.0.3.g30cc8d0f14
> >