linux-kernel - Re: [PATCH v7 03/11] kbuild: generate KSYMTAB entries by modpost

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Date:   Sat, 10 Jun 2023 17:56:22 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>,
        linux-um@...ts.infradead.org
Subject: Re: [PATCH v7 03/11] kbuild: generate KSYMTAB entries by modpost

On Thu, Jun 8, 2023 at 11:24 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> Commit 7b4537199a4a ("kbuild: link symbol CRCs at final link, removing
> CONFIG_MODULE_REL_CRCS") made modpost output CRCs in the same way
> whether the EXPORT_SYMBOL() is placed in *.c or *.S.
>
> For further cleanups, this commit applies a similar approach to the
> entire data structure of EXPORT_SYMBOL().
>
> The EXPORT_SYMBOL() compilation is split into two stages.
>
> When a source file is compiled, EXPORT_SYMBOL() is converted into a
> dummy symbol in the .export_symbol section.
>
> For example,
>
>     EXPORT_SYMBOL(foo);
>     EXPORT_SYMBOL_NS_GPL(bar, BAR_NAMESPACE);
>
> will be encoded into the following assembly code:
>
>     .section ".export_symbol","a"
>     __export_symbol__foo:
>             .asciz ""
>             .balign 4
>             .long foo - .


I hope this will work for all arches, but
unfortunately, the 0day bot reported breakages
on xtensa.

I will restore the code in v6.







-- 
Best Regards
Masahiro Yamada