linux-kernel - Re: [PATCH v2 00/13] kernel/locking: qspinlock improvements

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] [day] [month] [year] [list]

Message-ID: <20180413092441.cebb54suvjufw6m3@armageddon.cambridge.arm.com>
Date:   Fri, 13 Apr 2018 10:24:41 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Will Deacon <will.deacon@....com>
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        boqun.feng@...il.com, longman@...hat.com,
        paulmck@...ux.vnet.ibm.com, mingo@...nel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 00/13] kernel/locking: qspinlock improvements

On Wed, Apr 11, 2018 at 07:01:07PM +0100, Will Deacon wrote:
>   * Spin for a bounded duration while lock is observed in the
>     pending->locked transition

FWIW, I updated my model [1] to include the bounded handover loop and,
as expected, it passes the liveness check (well, assuming fairness of
other operations like fetch_or, cmpxchg etc).

[1] https://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/kernel-tla.git/tree/qspinlock.tla

-- 
Catalin