linux-kernel - Re: [PATCH 1/8] bootconfig: Set CONFIG_BOOT

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Message-Id: <20200220175543.ec6d58690dcda33f89290b55@kernel.org>
Date:   Thu, 20 Feb 2020 17:55:43 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Borislav Petkov <bp@...en8.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 1/8] bootconfig: Set CONFIG_BOOT_CONFIG=n by default

On Thu, 20 Feb 2020 09:16:56 +0100
Geert Uytterhoeven <geert@...ux-m68k.org> wrote:

> Hi Hiramatsu-san,
> 
> On Thu, Feb 20, 2020 at 8:26 AM Masami Hiramatsu <mhiramat@...nel.org> wrote:
> > Set CONFIG_BOOT_CONFIG=n by default. This also warns
> > user if CONFIG_BOOT_CONFIG=n but "bootconfig" is given
> > in the kernel command line.
> >
> > Suggested-by: Steven Rostedt <rostedt@...dmis.org>
> > Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> 
> Thanks for your patch!
> 
> > --- a/init/Kconfig
> > +++ b/init/Kconfig
> > @@ -1218,7 +1218,7 @@ endif
> >  config BOOT_CONFIG
> >         bool "Boot config support"
> >         depends on BLK_DEV_INITRD
> > -       default y
> > +       default n
> 
> "default n" is the default, so you can just drop the line.

OK.

> 
> >         help
> >           Extra boot config allows system admin to pass a config file as
> >           complemental extension of kernel cmdline when booting.
> > diff --git a/init/main.c b/init/main.c
> > index 59248717c925..680ff7123705 100644
> > --- a/init/main.c
> > +++ b/init/main.c
> > @@ -418,6 +418,14 @@ static void __init setup_boot_config(const char *cmdline)
> >  }
> >  #else
> >  #define setup_boot_config(cmdline)     do { } while (0)
> > +
> > +static int __init warn_bootconfig(char *str)
> > +{
> > +       pr_err("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOTCONFIG is not set.\n");
> 
> pr_warn()?

Yeah, agreed. 

OK, I'll update the patch.

Thank you!

> 
> > +       return 0;
> > +}
> > +early_param("bootconfig", warn_bootconfig);
> > +
> >  #endif
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> -- 
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds


-- 
Masami Hiramatsu <mhiramat@...nel.org>