linux-kernel - Re: [PATCH v2] kgdboc: fix return value of _

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Date:   Wed, 9 Mar 2022 16:14:18 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Igor Zhbanov <i.zhbanov@...russia.ru>,
        He Zhe <zhe.he@...driver.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        kgdb-bugreport@...ts.sourceforge.net,
        Jason Wessel <jason.wessel@...driver.com>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        linux-serial@...r.kernel.org
Subject: Re: [PATCH v2] kgdboc: fix return value of __setup handler

Hi,

On Tue, Mar 8, 2022 at 7:30 PM Randy Dunlap <rdunlap@...radead.org> wrote:
>
> __setup() handlers should return 1 to obsolete_checksetup() in
> init/main.c to indicate that the boot option has been handled.
> A return of 0 causes the boot option/value to be listed as an Unknown
> kernel parameter and added to init's (limited) environment strings.
> So return 1 from kgdboc_option_setup().
>
> Unknown kernel command line parameters "BOOT_IMAGE=/boot/bzImage-517rc7
>   kgdboc=kbd kgdbts=", will be passed to user space.
>
>  Run /sbin/init as init process
>    with arguments:
>      /sbin/init
>    with environment:
>      HOME=/
>      TERM=linux
>      BOOT_IMAGE=/boot/bzImage-517rc7
>      kgdboc=kbd
>      kgdbts=
>
> Fixes: 1bd54d851f50 ("kgdboc: Passing ekgdboc to command line causes panic")
> Fixes: f2d937f3bf00 ("consoles: polling support, kgdboc")
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Reported-by: Igor Zhbanov <i.zhbanov@...russia.ru>
> Link: lore.kernel.org/r/64644a2f-4a20-bab3-1e15-3b2cdd0defe3@...russia.ru
> Cc: He Zhe <zhe.he@...driver.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Jiri Slaby <jirislaby@...nel.org>
> Cc: kgdb-bugreport@...ts.sourceforge.net
> Cc: Jason Wessel <jason.wessel@...driver.com>
> Cc: Daniel Thompson <daniel.thompson@...aro.org>
> Cc: Douglas Anderson <dianders@...omium.org>
> Cc: linux-serial@...r.kernel.org
> ---
> v2- correct Fixes: tag(s) (thanks Doug)
>   - drop Cc: Laura Abbott <labbott@...hat.com> (bouncing)
>   - add a reference to init/main.c::obsolete_checksetup()
>
>  drivers/tty/serial/kgdboc.c |    6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)

Reviewed-by: Douglas Anderson <dianders@...omium.org>