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Date:   Fri, 2 Apr 2021 08:09:00 -0700
From:   Sami Tolvanen <>
To:     Alexander Lobakin <>
Cc:     Kees Cook <>, Jessica Yu <>,
        Miroslav Benes <>,
        Emil Velikov <>,
        Sean Christopherson <>,
        Masahiro Yamada <>,,
        linux-kbuild <>,
        LKML <>
Subject: Re: [PATCH] kbuild: merge module sections under CONFIG_LD_DEAD_CODE_DATA_ELIMINATION

On Fri, Apr 2, 2021 at 5:40 AM Alexander Lobakin <> wrote:
> -fdata-sections and -ffunction-sections are being enabled by the
> top-level Makefile, and module section merging is also needed.
> Expand the ifdef (and the comment block) to cover that case too.
> Fixes: 6a3193cdd5e5 ("kbuild: lto: Merge module sections if and only if CONFIG_LTO_CLANG is enabled")

Wouldn't this trigger the ld.bfd bug described in the commit message
when LD_DEAD_CODE_DATA_ELIMINATION is enabled? LTO_CLANG always uses
LLD, so it won't have this issue.


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