linux-kernel - Re: [PATCH v3] kconfig: Add yes2modconfig and mod2yesconfig targets.

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Date:   Wed, 18 Dec 2019 23:11:00 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH v3] kconfig: Add yes2modconfig and mod2yesconfig targets.

On Tue, Dec 17, 2019 at 6:42 PM Tetsuo Handa
<penguin-kernel@...ove.sakura.ne.jp> 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" 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>
> ---
> Changelog since v2:
> - Add 'if possible' to help message.
> - Make conf_rewrite_mod_or_yes() void.
> - Don't call check_conf() loop, for conf_write() takes care.
> - Use sym_add_change_count(1) to tell something has changed.
>
> Changelog since v1:
> - Updated the available 'help' targets in Makefile.

Applied to linux-kbuild. Thanks.



-- 
Best Regards
Masahiro Yamada