linux-kernel - Re: [PATCH 20/22] x86,word-at-a-time: Remove .fixup usage

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: <20211109212116.GW174703@worktop.programming.kicks-ass.net>
Date:   Tue, 9 Nov 2021 22:21:16 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Bill Wendling <morbo@...gle.com>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, mark.rutland@....com,
        dvyukov@...gle.com, seanjc@...gle.com, pbonzini@...hat.com,
        mbenes@...e.cz, llvm@...ts.linux.dev,
        linux-toolchains@...r.kernel.org
Subject: Re: [PATCH 20/22] x86,word-at-a-time: Remove .fixup usage

On Tue, Nov 09, 2021 at 12:59:12PM -0800, Bill Wendling wrote:
> 
> Adding attributes to labels shouldn't be difficult, as you mention. In
> the case of cold/hot, it's adjusting some of the metadata that already
> exists on some basic blocks. It might be enough to allow the normal
> block placement algorithms to move the hot and cold blocks around for
> us. The question becomes how many attributes does GCC allow on labels?

I'm aware of 3: unused, hot, cold. Also:

  https://gcc.gnu.org/onlinedocs/gcc/Label-Attributes.html