linux-kernel - Re: [PATCH] kbuild: lto: add _mcount to list of used symbols

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Date:   Fri, 26 Feb 2021 05:00:05 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Arnd Bergmann <arnd@...db.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kbuild: lto: add _mcount to list of used symbols

On Thu, Feb 25, 2021 at 11:35 PM Arnd Bergmann <arnd@...nel.org> wrote:
>
> From: Arnd Bergmann <arnd@...db.de>
>
> Some randconfig builds fail with undefined references to _mcount
> when CONFIG_TRIM_UNUSED_KSYMS is set:
>
> ERROR: modpost: "_mcount" [drivers/tee/optee/optee.ko] undefined!
> ERROR: modpost: "_mcount" [drivers/fsi/fsi-occ.ko] undefined!
> ERROR: modpost: "_mcount" [drivers/fpga/dfl-pci.ko] undefined!
>
> Since there is already a list of symbols that get generated at link
> time, add this one as well.
>
> Fixes: fbe078d397b4 ("kbuild: lto: add a default list of used symbols")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  scripts/lto-used-symbollist.txt | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/scripts/lto-used-symbollist.txt b/scripts/lto-used-symbollist.txt
> index 38e7bb9ebaae..406ada65e926 100644
> --- a/scripts/lto-used-symbollist.txt
> +++ b/scripts/lto-used-symbollist.txt
> @@ -1,5 +1,6 @@
>  memcpy
>  memmove
>  memset
> +_mcount
>  __stack_chk_fail
>  __stack_chk_guard
> --
> 2.29.2
>


Applied to linux-kbuild/fixes. Thanks.



-- 
Best Regards
Masahiro Yamada