linux-kernel - Re: [PATCH] kbuild: Merge module sections if and only if CONFIG_LTO

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Date:   Wed, 31 Mar 2021 12:56:02 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Sean Christopherson <seanjc@...gle.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        clang-built-linux@...glegroups.com, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kbuild: Merge module sections if and only if CONFIG_LTO_CLANG is enabled

On Mon, 22 Mar 2021 16:44:38 -0700, Sean Christopherson wrote:
> Merge module sections only when using Clang LTO.  With gcc-10, merging
> sections does not appear to update the symbol tables for the module,
> e.g. 'readelf -s' shows the value that a symbol would have had, if
> sections were not merged.
> 
> The stale symbol table breaks gdb's function disassambler, and presumably
> other things, e.g.
> 
> [...]

Applied to for-linus/lto, thanks!

[1/1] kbuild: lto: Merge module sections if and only if CONFIG_LTO_CLANG is enabled
      https://git.kernel.org/kees/c/8b382ebc86a8

-- 
Kees Cook