linux-kernel - Re: [PATCH] kconfig: Update config changed flag before calling callback

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Message-ID: <CAK7LNASuP4L3gNyHvx7xVe3hG0sqQjB5eidq=9zs+20Ce09GEA@mail.gmail.com>
Date:   Tue, 14 Mar 2023 03:47:01 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Jurica Vukadin <jura@...ad.in>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kconfig: Update config changed flag before calling callback

On Wed, Mar 8, 2023 at 4:40 AM Jurica Vukadin <jura@...ad.in> wrote:
>
> Prior to commit 5ee546594025 ("kconfig: change sym_change_count to a
> boolean flag"), the conf_updated flag was set to the new value *before*
> calling the callback. xconfig's save action depends on this behaviour,
> because xconfig calls conf_get_changed() directly from the callback and
> now sees the old value, thus never enabling the save button or the
> shortcut.
>
> Restore the previous behaviour.
>
> Fixes: 5ee546594025 ("kconfig: change sym_change_count to a boolean flag")
> Signed-off-by: Jurica Vukadin <jura@...ad.in>


Applied to linux-kbuild.
Thanks.


> ---
>  scripts/kconfig/confdata.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
> index b7c9f1dd5e42..992575f1e976 100644
> --- a/scripts/kconfig/confdata.c
> +++ b/scripts/kconfig/confdata.c
> @@ -1226,10 +1226,12 @@ static void (*conf_changed_callback)(void);
>
>  void conf_set_changed(bool val)
>  {
> -       if (conf_changed_callback && conf_changed != val)
> -               conf_changed_callback();
> +       bool changed = conf_changed != val;
>
>         conf_changed = val;
> +
> +       if (conf_changed_callback && changed)
> +               conf_changed_callback();
>  }
>
>  bool conf_get_changed(void)
> --
> 2.39.2
>


-- 
Best Regards
Masahiro Yamada