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

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Date:   Mon, 14 Mar 2022 09:07:13 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     chenguanyou <chenguanyou9338@...il.com>
Cc:     longman@...hat.com, dave@...olabs.net, hdanton@...a.com,
        jaegeuk@...gle.com, linux-kernel@...r.kernel.org,
        mazhenhua@...omi.com, mingo@...hat.com, peterz@...radead.org,
        quic_aiquny@...cinc.com, will@...nel.org
Subject: Re: [PATCH v5] locking/rwsem: Make handoff bit handling more
 consistent

On Thu, Feb 17, 2022 at 11:41:54PM +0800, chenguanyou wrote:
> >>>>> 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.

What ever happened with this testing?

thanks,

greg k-h