linux-kernel - Re: [RFC PATCH] locking/atomics/powerpc: Introduce optimized cmpxchg

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: <cafd11f9b594903ff1f0acc4d7e7f7453aeb971f.camel@kernel.crashing.org>
Date:   Sun, 06 May 2018 11:56:44 +1000
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        aryabinin@...tuozzo.com, boqun.feng@...il.com,
        catalin.marinas@....com, dvyukov@...gle.com, will.deacon@....com
Subject: Re: [RFC PATCH] locking/atomics/powerpc: Introduce optimized
 cmpxchg_release() family of APIs for PowerPC

On Sat, 2018-05-05 at 12:00 +0200, Ingo Molnar wrote:
> This clearly suggests that PPC_RELEASE_BARRIER is in active use and 'lwsync' is 
> the 'release barrier' instruction, if I interpreted that right.

The closest to one we got.

The semantics are that it orders all load/store pairs to cachable
storage except store+load.

Cheers,
Ben.