linux-kernel - Re: [PATCH] locking/mutex: Reduce chance of setting HANDOFF bit on unlocked mutex

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: <YNx4IWfE/wpFFh0h@hirez.programming.kicks-ass.net>
Date:   Wed, 30 Jun 2021 15:56:49 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Waiman Long <llong@...hat.com>
Cc:     Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Boqun Feng <boqun.feng@...il.com>,
        linux-kernel@...r.kernel.org,
        "Xu, Yanfei" <yanfei.xu@...driver.com>
Subject: Re: [PATCH] locking/mutex: Reduce chance of setting HANDOFF bit on
 unlocked mutex

On Wed, Jun 30, 2021 at 09:50:11AM -0400, Waiman Long wrote:

> The code looks good to me. It is an even better approach to make sure that
> the HANDOFF will never be set on an unlocked mutex.
> 
> Reviewed-by: Waiman Long <longman@...hat.com>

Thanks, what about that XXX? Should we not check sigpending before doing
the optimistic spinning thing?