linux-kernel - Re: [PATCH v2 2/2] modpost: Include '.text.*' in TEXT

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Date:   Mon, 12 Dec 2022 22:13:20 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, Nicolas Schier <nicolas@...sle.eu>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Vincent Donnefort <vdonnefort@...gle.com>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, patches@...ts.linux.dev,
        Alexander Lobakin <alexandr.lobakin@...el.com>
Subject: Re: [PATCH v2 2/2] modpost: Include '.text.*' in TEXT_SECTIONS

On Thu, Dec 8, 2022 at 4:17 AM Nathan Chancellor <nathan@...nel.org> wrote:
>
> Commit 6c730bfc894f ("modpost: handle -ffunction-sections") added
> ".text.*" to the OTHER_TEXT_SECTIONS macro to fix certain section
> mismatch warnings. Unfortunately, this makes it impossible for modpost
> to warn about section mismatchs with LTO, which implies

"mismatches"
Other than the typo, this patch looks good to me.

It was just 1/2 was difficult for me to understand.




> '-ffunction-sections', as all functions are put in their own
> '.text.<func_name>' sections, which may still reference functions in
> sections they are not supposed to, such as __init.
>
> Fix this by moving ".text.*" into TEXT_SECTIONS, so that configurations
> with '-ffunction-sections' will see warnings about mismatched sections.
>
> Link: https://lore.kernel.org/Y39kI3MOtVI5BAnV@google.com/
> Reported-by: Vincent Donnefort <vdonnefort@...gle.com>
> Reviewed-and-tested-by: Alexander Lobakin <alexandr.lobakin@...el.com>
> Reviewed-by: Sami Tolvanen <samitolvanen@...gle.com>
> Tested-by: Vincent Donnefort <vdonnefort@...gle.com>
> Signed-off-by: Nathan Chancellor <nathan@...nel.org>
> ---
>  scripts/mod/modpost.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
> index 2c80da0220c3..c861beabc128 100644
> --- a/scripts/mod/modpost.c
> +++ b/scripts/mod/modpost.c
> @@ -823,10 +823,10 @@ static void check_section(const char *modname, struct elf_info *elf,
>  #define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS
>
>  #define DATA_SECTIONS ".data", ".data.rel"
> -#define TEXT_SECTIONS ".text", ".text.unlikely", ".sched.text", \
> +#define TEXT_SECTIONS ".text", ".text.*", ".sched.text", \
>                 ".kprobes.text", ".cpuidle.text", ".noinstr.text"
>  #define OTHER_TEXT_SECTIONS ".ref.text", ".head.text", ".spinlock.text", \
> -               ".fixup", ".entry.text", ".exception.text", ".text.*", \
> +               ".fixup", ".entry.text", ".exception.text", \
>                 ".coldtext", ".softirqentry.text"
>
>  #define INIT_SECTIONS      ".init.*"
> --
> 2.38.1
>


-- 
Best Regards
Masahiro Yamada