linux-kernel - Re: [PATCH v3 0/8] tools: fix compilation failure caused by init_disassemble

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Date:   Mon, 1 Aug 2022 21:53:34 +0200
From:   Jiri Olsa <olsajiri@...il.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Andres Freund <andres@...razel.de>, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Quentin Monnet <quentin@...valent.com>,
        Ben Hutchings <benh@...ian.org>
Subject: Re: [PATCH v3 0/8] tools: fix compilation failure caused by
 init_disassemble_info API changes

On Mon, Aug 01, 2022 at 09:45:06AM -0300, Arnaldo Carvalho de Melo wrote:
> Em Sun, Jul 31, 2022 at 06:38:26PM -0700, Andres Freund escreveu:
> > 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
> > 
> > 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?
> 
> I think its ok
>  
> > WRT the feature test: Not sure what the point of the -DPACKAGE='"perf"' is,
> 
> I think its related to libbfd, and it comes from a long time ago, trying
> to find the cset adding that...
> 
> > 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
> 
> Cool, thanks, I'll process the first 4 patches, then at some point the
> bpftool bits can be merged, alternatively I can process those as well if
> the bpftool maintainers are ok with it.
> 
> I'll just wait a bit to see if Jiri and others have something to say.

looks good

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka

> 
> - Arnaldo
> 
> > - included a bit more information about tests I did in commit messages
> > - add a maybe_unused to fprintf_json_styled's style argument
> > 
> > V3:
> > - don't include dis-asm-compat.h when building without libbfd
> >   (Ben Hutchings)
> > - don't include compiler.h in dis-asm-compat.h, use (void) casts instead,
> >   to avoid compiler.h include due to potential licensing conflict
> > - dual-license dis-asm-compat.h, for better compatibility with the rest of
> >   bpftool's code (suggested by Quentin Monnet)
> > - don't display feature-disassembler-init-styled test
> >   (suggested by Jiri Olsa)
> > - don't display feature-disassembler-four-args test, I split this for the
> >   different subsystems, but maybe that's overkill? (suggested by Jiri Olsa)
> > 
> > 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>
> > CC: Ben Hutchings <benh@...ian.org>
> > Cc: bpf@...r.kernel.org
> > Cc: 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 (8):
> >   tools build: Add feature test for init_disassemble_info API changes
> >   tools build: Don't display disassembler-four-args feature test
> >   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 bpf_jit_disasm: Don't display disassembler-four-args feature
> >     test
> >   tools bpftool: Fix compilation error with new binutils
> >   tools bpftool: Don't display disassembler-four-args feature test
> > 
> >  tools/bpf/Makefile                            |  7 ++-
> >  tools/bpf/bpf_jit_disasm.c                    |  5 +-
> >  tools/bpf/bpftool/Makefile                    |  8 ++-
> >  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          | 55 +++++++++++++++++++
> >  tools/perf/Makefile.config                    |  8 +++
> >  tools/perf/util/annotate.c                    |  7 ++-
> >  11 files changed, 138 insertions(+), 19 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
> 
> -- 
> 
> - Arnaldo