linux-kernel - Re: [PATCH] kconfig: add fflush() before ferror() check

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Message-ID: <CAK7LNAQNm7Ly6AEx1XBD=gSbQs=Av+TM1bcX5m=DGRSs5BhKqA@mail.gmail.com>
Date:   Fri, 18 Feb 2022 11:34:34 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        David Laight <David.Laight@...lab.com>
Subject: Re: [PATCH] kconfig: add fflush() before ferror() check

On Sun, Feb 13, 2022 at 1:19 AM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> As David Laight pointed out, there is not much point in calling
> ferror() unless you call fflush() first.
>
> Reported-by: David Laight <David.Laight@...LAB.COM>
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---

Applied to linux-kbuild.


>
>  scripts/kconfig/confdata.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
> index d3c3a61308ad..94dcec2cc803 100644
> --- a/scripts/kconfig/confdata.c
> +++ b/scripts/kconfig/confdata.c
> @@ -979,6 +979,7 @@ static int conf_write_autoconf_cmd(const char *autoconf_name)
>
>         fprintf(out, "\n$(deps_config): ;\n");
>
> +       fflush(out);
>         ret = ferror(out); /* error check for all fprintf() calls */
>         fclose(out);
>         if (ret)
> @@ -1097,6 +1098,7 @@ static int __conf_write_autoconf(const char *filename,
>                 if ((sym->flags & SYMBOL_WRITE) && sym->name)
>                         print_symbol(file, sym);
>
> +       fflush(file);
>         /* check possible errors in conf_write_heading() and print_symbol() */
>         ret = ferror(file);
>         fclose(file);
> --
> 2.32.0
>


-- 
Best Regards
Masahiro Yamada