linux-kernel - Re: [PATCH] kconfig: add warn-unknown-symbols sanity check

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Message-ID: <20230830004533.GG3913@google.com>
Date:   Wed, 30 Aug 2023 09:45:33 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Sergey Senozhatsky <senozhatsky@...omium.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>,
        Jonathan Corbet <corbet@....net>,
        Tomasz Figa <tfiga@...omium.org>, linux-kbuild@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kconfig: add warn-unknown-symbols sanity check

On (23/08/29 22:13), Masahiro Yamada wrote:
> > +KCONFIG_WARN_UNKNOWN_SYMBOLS
> > +----------------------------
> > +This environment variable makes Kconfig warn about all unrecognized
> > +symbols in the .config file.
> 
> 
> This warns not only for the .config but also defconfig files.
> 
> Could you reword it?
> 
> For example,
> 
>  "symbols in the config input".

Done.

> 
> 
> > +
> > +KCONFIG_WERROR
> > +--------------
> > +If set, Kconfig will treat `KCONFIG_WARN_UNKNOWN_SYMBOLS` warnings as
> > +errors.
> 
> My hope is to turn other warnings in the config file into errors.

Done.

> > +++ b/scripts/kconfig/confdata.c
> > @@ -349,7 +349,12 @@ int conf_read_simple(const char *name, int def)
> >         char *p, *p2;
> >         struct symbol *sym;
> >         int i, def_flags;
> > +       bool found_unknown = false;
> > +       const char *warn_unknown;
> > +       const char *werror;
> >
> > +       warn_unknown = getenv("KCONFIG_WARN_UNKNOWN_SYMBOLS");
> > +       werror = getenv("KCONFIG_WERROR");
> >         if (name) {
> >                 in = zconf_fopen(name);
> >         } else {
> > @@ -437,6 +442,13 @@ int conf_read_simple(const char *name, int def)
> >                         if (def == S_DEF_USER) {
> >                                 sym = sym_find(line + 2 + strlen(CONFIG_));
> >                                 if (!sym) {
> > +                                       if (warn_unknown) {
> > +                                               conf_warning("unknown symbol: %s",
> > +                                                            line + 2 + strlen(CONFIG_));
> > +                                               found_unknown = true;
> > +                                               continue;
> 
> Please drop this 'continue' because it would skip
> conf_set_changed(true).

My bad. Those 'continue' are left-overs from previous version.

> > +                                       }
> > +
> >                                         conf_set_changed(true);
> >                                         continue;
> >                                 }
> > @@ -471,6 +483,13 @@ int conf_read_simple(const char *name, int def)
> >
> >                         sym = sym_find(line + strlen(CONFIG_));
> >                         if (!sym) {
> > +                               if (warn_unknown && def != S_DEF_AUTO) {
> > +                                       conf_warning("unknown symbol: %s",
> > +                                                    line + strlen(CONFIG_));
> > +                                       found_unknown = true;
> > +                                       continue;
> 
> Same here.

Same here. My bad.

> > @@ -519,6 +538,10 @@ int conf_read_simple(const char *name, int def)
> >         }
> >         free(line);
> >         fclose(in);
> > +
> > +       if (found_unknown && werror)
> > +               exit(1);
> 
> 
> I like to reuse 'conf_warnings' as you did in the previous version.

Done.