linux-kernel - Re: [PATCH v2] tools: memory-model: Make plain accesses carry dependencies

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Date:   Sat, 3 Dec 2022 12:52:02 -0800
From:   Boqun Feng <boqun.feng@...il.com>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     "stern@...land.harvard.edu" <stern@...land.harvard.edu>,
        Jonas Oberhauser <jonas.oberhauser@...wei.com>,
        "parri.andrea@...il.com" <parri.andrea@...il.com>,
        "will@...nel.org" <will@...nel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "npiggin@...il.com" <npiggin@...il.com>,
        "dhowells@...hat.com" <dhowells@...hat.com>,
        "j.alglave@....ac.uk" <j.alglave@....ac.uk>,
        "luc.maranget@...ia.fr" <luc.maranget@...ia.fr>,
        "akiyks@...il.com" <akiyks@...il.com>,
        "dlustig@...dia.com" <dlustig@...dia.com>,
        "joel@...lfernandes.org" <joel@...lfernandes.org>,
        "urezki@...il.com" <urezki@...il.com>,
        "quic_neeraju@...cinc.com" <quic_neeraju@...cinc.com>,
        "frederic@...nel.org" <frederic@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] tools: memory-model: Make plain accesses carry
 dependencies

On Sat, Dec 03, 2022 at 12:44:05PM -0800, Paul E. McKenney wrote:
> On Sat, Dec 03, 2022 at 03:34:20PM -0500, stern@...land.harvard.edu wrote:
> > On Sat, Dec 03, 2022 at 11:02:26AM -0800, Paul E. McKenney wrote:
> > > On Sat, Dec 03, 2022 at 11:58:36AM +0000, Jonas Oberhauser wrote:
> > > > 
> > > > 
> > > > -----Original Message-----
> > > > From: Boqun Feng [mailto:boqun.feng@...il.com] 
> > > > Sent: Friday, December 2, 2022 7:50 PM
> > > 
> > > > > I wonder is this patch a first step to solve the OOTA problem you reported in OSS:
> > > > >	https://static.sched.com/hosted_files/osseu2022/e1/oss-eu22-jonas.pdf
> > > > > If so maybe it's better to put the link in the commit log I think.
> > > > 
> > > > It's not directly related to that specific problem, it does solve some other OOTA issues though.
> > > > If you think we should link to the talk, there's also a video with slightly more updated slides from the actual talk: https://www.youtube.com/watch?v=iFDKhIxKhoQ
> > > > do you think I should link to both then?
> > > 
> > > It is not hard for me to add that in if people believe that it should be
> > > included.  But default is lazy in this case.  ;-)
> > 
> > I don't think there's any need to mention that video in the commit log.  
> > It's an introductory talk, and it's pretty safe to assume that anyone 
> > reading the commit because they are interested in the LKMM in great 
> > detail is already beyond the introductory level.
> > 
> > On the other hand, it wouldn't hurt to include a Link: tag to an 
> > appropriate message in this email thread.  (I leave it up to Paul to 
> > decide which message is most "appropriate" -- there may not be a good 
> > candidate, because a lot of the messages were not CC'ed to LKML.)
> 
> For this approach, I would add this:
> 
> Link: https://lore.kernel.org/all/4262e55407294a5989e766bc4dc48293@huawei.com/
> 
> I could of course do both the extra paragraph -and- the Link:.  ;-)
> 
> Thoughts?
> 

I think only having Link: is fine ;-) And I agree with Alan, no need to
mention that video.

Thank you!

Regards,
Boqun

> 							Thanx, Paul