linux-kernel - Re: [PATCH] kconfig: Add yes2modconfig and mod2yesconfig targets.

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Date:   Fri, 6 Dec 2019 08:09:03 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Masahiro Yamada <masahiroy@...nel.org>,
        linux-kbuild@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH] kconfig: Add yes2modconfig and mod2yesconfig targets.

On 12/6/19 1:50 AM, Tetsuo Handa wrote:
> Since kernel configs provided by syzbot are close to "make allyesconfig",
> it takes long time to rebuild. This is especially waste of time when we
> need to rebuild for many times (e.g. doing manual printk() inspection,
> bisect operations).
> 
> We can save time if we can exclude modules which are irrelevant to each
> problem. But "make localmodconfig" cannot exclude modules which are built
> into vmlinux because /sbin/lsmod output is used as the source of modules.
> 
> Therefore, this patch adds "make yes2modconfig" which converts from =y
> to =m if possible. After confirming that the interested problem is still
> reproducible, we can try "make localmodconfig" (and/or manually tune
> based on "Modules linked in:" line) in order to exclude modules which are
> irrelevant to the interested problem. While we are at it, this patch also
> adds "make mod2yesconfig" target which converts from =m to =y in case
> someone wants to convert from =m to =y after "make localmodconfig".
> 
> Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
> Cc: Dmitry Vyukov <dvyukov@...gle.com>
> ---
>  scripts/kconfig/Makefile   |  2 +-
>  scripts/kconfig/conf.c     | 17 +++++++++++++++++
>  scripts/kconfig/confdata.c | 26 ++++++++++++++++++++++++++
>  scripts/kconfig/lkc.h      |  3 +++
>  4 files changed, 47 insertions(+), 1 deletion(-)
> 
> diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
> index 2f1a59fa5169..3516809255be 100644
> --- a/scripts/kconfig/Makefile
> +++ b/scripts/kconfig/Makefile
> @@ -67,7 +67,7 @@ localyesconfig localmodconfig: $(obj)/conf
>  #  deprecated for external use
>  simple-targets := oldconfig allnoconfig allyesconfig allmodconfig \
>  	alldefconfig randconfig listnewconfig olddefconfig syncconfig \
> -	helpnewconfig
> +	helpnewconfig yes2modconfig mod2yesconfig
>  
>  PHONY += $(simple-targets)


In this Makefile (above), please also update the available 'help' targets.

-- 
~Randy