linux-kernel - Re: Link time optimization for LTO/x86

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20171129230952.GA138088@samitolvanen.mtv.corp.google.com>
Date:   Wed, 29 Nov 2017 15:09:52 -0800
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org, alxmtvv@...il.com,
        linux-kbuild@...r.kernel.org, yamada.masahiro@...ionext.com,
        akpm@...ux-foundation.org
Subject: Re: Link time optimization for LTO/x86

Hi Andi,

On Mon, Nov 27, 2017 at 01:34:02PM -0800, Andi Kleen wrote:
> This is an updated version of my older LTO patchkit for gcc/x86
> This version doesn't need special binutils, but requires gcc 5+.
> It also is compatible with near all options (except MODVERSIONS)

Would you mind changing the config option prefix to LTO_GCC, for
example? It looks like there are a few places where gcc LTO needs
to be disabled, but clang LTO works fine, and vice versa.

My earlier clang LTO patches also had a solution for MODVERSIONS,
which might work with gcc as well.

Sami