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From:   chenguanyou <chenguanyou9338@gmail.com>
To:     longman@redhat.com
Cc:     chenguanyou9338@gmail.com, dave@stgolabs.net,
        gregkh@linuxfoundation.org, hdanton@sina.com, jaegeuk@google.com,
        linux-kernel@vger.kernel.org, mazhenhua@xiaomi.com,
        mingo@redhat.com, peterz@infradead.org, quic_aiquny@quicinc.com,
        will@kernel.org
Subject: Re:[PATCH v5] locking/rwsem: Make handoff bit handling more consistent
Date:   Thu, 17 Feb 2022 23:41:54 +0800
Message-Id: <20220217154154.6030-1-chenguanyou@xiaomi.com>
In-Reply-To: <cb03cbe5-0357-144d-0660-3ebc50c0245a@redhat.com>
References: <cb03cbe5-0357-144d-0660-3ebc50c0245a@redhat.com>
Precedence: bulk

>>>>> Hi Waiman, Greg,
>>>>> This patch has been merged in branch linux-5.16.y.
>>>>> Can we take it to the linux-5.10.y LTS version?
>>>> What is "this patch"?
>>> commit d257cc8cb8d5355ffc43a96bab94db7b5a324803 ("locking/rwsem: Make handoff bit handling more consistent")
>> Have you tested it on the 5.10.y branch to verify it actually works
>> properly for you?
>>
>> If so, please provide a working backport to the stable list, as it does
>> not apply cleanly as-is.
>>
>> thanks,
>>
>> greg k-h
>>
> I have attached the 5.10.y backport of commit 
> d257cc8cb8d5355ffc43a96bab94db7b5a324803 ("locking/rwsem: Make handoff 
> bit handling more consistent"). I also include a backport of commit 
> 2f06f702925b512a95b95dca3855549c047eef58 ("locking/rwsem: Prevent 
> potential lock starvation") which I think may help Jaegeuk. I had run 
> some sanity tests and the backported patches work fine. However, I don't 
> have access to their testing environments to verify if they can fix the 
> problems seem by Chen or Jaegeuk. So please test these patches to see if 
> they can address your problems.

Hi Longman,

I'll do some stability testing on our 5.10 phone.

thanks,
Guanyou.Chen