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

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Message-ID: <YNyDz3F3w2EFZfQs@hirez.programming.kicks-ass.net>
Date:   Wed, 30 Jun 2021 16:46:39 +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 10:13:06AM -0400, Waiman Long wrote:

> Sorry, I missed the XXX comment:-)
> 
> This is a generic problem as other waiters that go into the spinning loop
> also don't check for sigpending. On the other hand, I am fine with doing the
> pending signal check before doing the optimistic spinning.

True.. OK, lemme write changelogs for the 4 patches I've ended up with
and post them. Then we can look at that whole sigpending crud.