linux-kernel - Re: [PATCH 07/22] kbuild: lto: merge module sections

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Message-ID: <20200624213129.GC26253@google.com>
Date:   Wed, 24 Jun 2020 14:31:29 -0700
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Will Deacon <will@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        linux-arch <linux-arch@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, linux-pci@...r.kernel.org,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>
Subject: Re: [PATCH 07/22] kbuild: lto: merge module sections

On Wed, Jun 24, 2020 at 02:01:59PM -0700, 'Nick Desaulniers' via Clang Built Linux wrote:
> On Wed, Jun 24, 2020 at 1:33 PM Sami Tolvanen <samitolvanen@...gle.com> wrote:
> >
> > LLD always splits sections with LTO, which increases module sizes. This
> > change adds a linker script that merges the split sections in the final
> > module and discards the .eh_frame section that LLD may generate.
> 
> For discarding .eh_frame, Kees is currently fighting with a series
> that I would really like to see land that enables warnings on orphan
> section placement.  I don't see any new flags to inhibit .eh_frame
> generation, or discard it in the linker script, so I'd expect it to be
> treated as an orphan section and kept.  Was that missed, or should
> that be removed from the commit message?

It should be removed from the commit message, thanks for pointing it
out.

Sami