Date:   Fri, 27 Oct 2023 12:40:39 -0700
From:   Justin Stitt <justinstitt@...gle.com>
To:     Joe Perches <joe@...ches.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
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Subject: Re: [PATCH next v2 2/3] checkpatch: add ethtool_sprintf rules

On Thu, Oct 26, 2023 at 3:39 PM Joe Perches <joe@...ches.com> wrote:
>
> On Thu, 2023-10-26 at 21:56 +0000, Justin Stitt wrote:
> > Add some warnings for using ethtool_sprintf() where a simple
> > ethtool_puts() would suffice.
> []
> > diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> []
> > @@ -7011,6 +7011,25 @@ sub process {
> >                            "Prefer strscpy, strscpy_pad, or __nonstring over strncpy - see: https://github.com/KSPP/linux/issues/90\n" . $herecurr);
> >               }
> >
> > +# ethtool_sprintf uses that should likely be ethtool_puts
> > +             if ($line =~ /\bethtool_sprintf\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\)/) {
> > +                     if(WARN("ETHTOOL_SPRINTF",
> > +                        "Prefer ethtool_puts over ethtool_sprintf with only two arguments\n" . $herecurr) &&
> > +         $fix) {
> > +         $fixed[$fixlinenr] =~ s/ethtool_sprintf\s*\(/ethtool_puts\(/;
> > +       }
> > +             }
> > +
> > +             # use $rawline because $line loses %s via sanitization and thus we can't match against it.
> > +             if ($rawline =~ /\bethtool_sprintf\s*\(\s*$FuncArg\s*,\s*\"\%s\"\s*,\s*$FuncArg\s*\)/) {
> > +                     if(WARN("ETHTOOL_SPRINTF",
> > +                        "Prefer ethtool_puts over ethtool_sprintf with standalone \"%s\" specifier\n" . $herecurr) &&
> > +         $fix) {
> > +         $fixed[$fixlinenr] =~ s/ethtool_sprintf\s*\(\s*(.*?),.*?,(.*?)\)/ethtool_puts\($1,$2)/;
>
> Thanks, but:
>
> This fix wouldn't work if the first argument was itself a function
> with multiple arguments.
>
> And this is whitespace formatted incorrectly.
>
> It:
>
> o needs a space after if
> o needs a space after the comma in the fix
> o needs to use the appropriate amount and tabs for indentation
> o needs alignment to open parentheses
> o the backslashes are not required in the fix block
>
> Do you want me to push what I wrote in the link below?
> https://lore.kernel.org/lkml/7eec92d9e72d28e7b5202f41b02a383eb28ddd26.camel@perches.com/

Ah, I didn't see you provided a diff in previous thread.

Yeah you can push it but it's not really a standalone so perhaps I'll
just steal the diff and
wrap into v3?

>
> > +       }
> > +             }
> > +
> > +
> >  # typecasts on min/max could be min_t/max_t
> >               if ($perl_version_ok &&
> >                   defined $stat &&
> >
>

Thanks
Justin

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