linux-kernel - Re: [PATCH v2] scripts/check-local-export: avoid 'wait $!' for process substitution

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Date:   Wed, 8 Jun 2022 09:48:50 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Michael Ellerman <mpe@...erman.id.au>,
        Wang Yugui <wangyugui@...-tech.com>,
        Jon Hunter <jonathanh@...dia.com>,
        Jonathan Corbet <corbet@....net>,
        Nathan Chancellor <nathan@...nel.org>,
        Tom Rix <trix@...hat.com>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        clang-built-linux <llvm@...ts.linux.dev>
Subject: Re: [PATCH v2] scripts/check-local-export: avoid 'wait $!' for
 process substitution

On Wed, Jun 8, 2022 at 2:24 AM Nick Desaulniers <ndesaulniers@...gle.com> wrote:
>
> On Tue, Jun 7, 2022 at 9:41 AM Masahiro Yamada <masahiroy@...nel.org> wrote:
> >
> > Bash>=4.4 supports 'wait $!' to check the exit status of a process
> > substitution, but some people using older bash versions reported an
> > error like this:
> >
> > Reported-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
> > Reported-by: Michael Ellerman <mpe@...erman.id.au>
> > Reported-by: Wang Yugui <wangyugui@...-tech.com>
> > Tested-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
> > Tested-by: Jon Hunter <jonathanh@...dia.com>
> > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
>
> Acked-by: Nick Desaulniers <ndesaulniers@...gle.com>
>
> Some comments below.
>
> > diff --git a/Documentation/process/changes.rst b/Documentation/process/changes.rst
> > index 34415ae1af1b..19c286c23786 100644
> > --- a/Documentation/process/changes.rst
> > +++ b/Documentation/process/changes.rst
> > @@ -32,6 +32,7 @@ you probably needn't concern yourself with pcmciautils.
> >  GNU C                  5.1              gcc --version
> >  Clang/LLVM (optional)  11.0.0           clang --version
> >  GNU make               3.81             make --version
> > +bash                   4.2              bash --version
>
> /usr/bin/env bash
> and definitely /bin/bash
> both show up a lot in kernel sources. At this point, I think bash is a
> requirement at this point, so it's good to document it finally.
>
> > +# If there is no symbol in the object, ${NM} (both GNU nm and llvm-nm) shows
> > +# 'no symbols' diagnostic (but exits with 0). It is harmless and hidden by
> > +# '2>/dev/null'. However, it suppresses real error messages as well. Add a
> > +# hand-crafted error message here.
> > +#
> > +# Use --quiet instead of 2>/dev/null when we upgrade the minimum version of
> > +# binutils to 2.37, llvm to 13.0.0.
>
> Might be nice to include `TODO:` in the comment block. Vim will
> highlight these in comments.


OK. will do.

Thanks.


-- 
Best Regards
Masahiro Yamada