linux-kernel - Re: [PATCH RESEND] gen-insn-attr-x86.awk: Fix regexp warnings

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Date:   Mon, 23 Sep 2019 13:54:22 +0300
From:   Alexander Kapshuk <alexander.kapshuk@...il.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>, tglx@...utronix.de,
        mingo@...hat.com, hpa@...or.com, x86@...nel.org,
        kbuild test robot <lkp@...el.com>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH RESEND] gen-insn-attr-x86.awk: Fix regexp warnings

On Mon, Sep 23, 2019 at 1:31 PM Borislav Petkov <bp@...en8.de> wrote:
>
> + Masami.
>
> On Sun, Sep 22, 2019 at 06:03:28PM +0300, Alexander Kapshuk wrote:
> > This patch fixes the regexp warnings shown below:
>
> Avoid having "This patch" or "This commit" in the commit message. It is
> tautologically useless.
>
> Also, do
>
> $ git grep 'This patch' Documentation/process
>
> for more details.
>
> > GEN      /home/sasha/torvalds/tools/objtool/arch/x86/lib/inat-tables.c
> > awk: ../arch/x86/tools/gen-insn-attr-x86.awk:260: warning: regexp escape sequence `\:' is not a known regexp operator
> > awk: ../arch/x86/tools/gen-insn-attr-x86.awk:350: (FILENAME=../arch/x86/lib/x86-opcode-map.txt FNR=41) warning: regexp escape sequence `\&' is not a known regexp operator
> >
> > The ':' and '&' characters need not escaping when used in string constants
> > as part of regular expressions.
>
> I could use a reasoning here, as in, "gawk manual doesn't have those two
> characters in the list here:
>
> https://www.gnu.org/software/gawk/manual/html_node/Escape-Sequences.html"
>
> or so.
>
> >
> > [Test-run]
> > awk -f arch/x86/tools/gen-insn-attr-x86.awk \
> >       arch/x86/lib/x86-opcode-map.txt >../tmp/inat-tables.c
> >
> > diff arch/x86/lib/inat-tables.c ~/tmp/inat-tables.c; echo $?
> > 0
> >
> > awk -f tools/arch/x86/tools/gen-insn-attr-x86.awk \
> >       tools/arch/x86/lib/x86-opcode-map.txt >../tmp/inat-tables.c
> >
> > diff tools/objtool/arch/x86/lib/inat-tables.c ~/tmp/inat-tables.c; echo $?
> > 0
>
> No need for that - just say that diffing the output before and after
> shows no changes.
>
> > [Debugging output]
> > DBG:ext:(66&F2)
> > DBG:match(ext, ...):(66&F2)
> > DBG:match(..., lprefix3_expr):\((F2|!F3|66&F2)\)
>
> That is supposed to say what exactly? That it still does what it is
> expected to do?

That was the intention.

Thanks for reviewing the patch.
I'll wait to hear from Masami before resending the patch.

>
> Leaving in the rest for Masami.
>
> Thx.
> --
> Regards/Gruss,
>     Boris.
>
> https://people.kernel.org/tglx/notes-about-netiquette