linux-kernel - Re: [PATCH v5] locking/rwsem: Make handoff bit handling more consistent

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Message-ID: <eda947e6-367a-9e7e-84cf-dee4a70a3b82@redhat.com>
Date:   Thu, 14 Apr 2022 11:44:33 -0400
From:   Waiman Long <longman@...hat.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     john.p.donnelly@...cle.com,
        chenguanyou <chenguanyou9338@...il.com>, dave@...olabs.net,
        hdanton@...a.com, linux-kernel@...r.kernel.org,
        mazhenhua@...omi.com, mingo@...hat.com, peterz@...radead.org,
        quic_aiquny@...cinc.com, will@...nel.org, sashal@...nel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH v5] locking/rwsem: Make handoff bit handling more
 consistent

On 4/14/22 11:42, Greg KH wrote:
> On Thu, Apr 14, 2022 at 11:18:23AM -0400, Waiman Long wrote:
>> On 4/14/22 06:48, Greg KH wrote:
>>> On Tue, Apr 12, 2022 at 01:04:05PM -0400, Waiman Long wrote:
>>>> The patch has already been in the tip tree. It may not be easy to add a
>>>> Fixes tag to it. Anyway, I will encourage stable tree maintainer to take it
>>>> as it does fix a problem as shown in your test.
>>> I have no idea what you want me to do here.  Please be explicit...
>>>
>> I would like the stable trees to include commit 1ee326196c66
>> ("locking/rwsem: Always try to wake waiters in out_nolock path") after it is
>> merged into the mainline in the v5.19 merge window. It should be applied to
>> the stable trees that have incorporated the backport of commit d257cc8cb8d5
>> ("locking/rwsem: Make handoff bit handling more consistent") since this
>> commit seems to make the missed wakeup problem easier to show up.
> Please let us know when this is merged into Linus's tree.  Nothing we
> can do until then and I'm not going to remember this in a few months
> anyway.

Sure, I will remind you again after the merge happens.

Cheers,
Longman