linux-kernel - Re: [GIT PULL tip/core/rcu] RCU commits for v5.9

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Date:   Thu, 30 Jul 2020 16:15:12 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org, rcu@...r.kernel.org, arnd@...db.de,
        bigeasy@...utronix.de, elver@...gle.com, ethp@...com,
        frederic@...nel.org, jbi.octave@...il.com, joel@...lfernandes.org,
        lihaoliang@...gle.com, madhuparnabhowmik10@...il.com,
        mchehab+huawei@...nel.org, peter.enderborg@...y.com,
        rdunlap@...radead.org, richard.weiyang@...ux.alibaba.com,
        urezki@...il.com, zou_wei@...wei.com, tglx@...utronix.de
Subject: Re: [GIT PULL tip/core/rcu] RCU commits for v5.9

On Fri, Jul 31, 2020 at 12:20:57AM +0200, Ingo Molnar wrote:
> 
> * Paul E. McKenney <paulmck@...nel.org> wrote:
> 
> > Hello, Ingo!
> > 
> > This pull request contains the following changes:
> > 
> > 1.	Documentation updates.
> > 
> > 	https://lore.kernel.org/lkml/20200623000923.GA25047@paulmck-ThinkPad-P72
> > 
> > 2.	Miscellaneous fixes.
> > 
> > 	https://lore.kernel.org/lkml/20200623002128.GA25456@paulmck-ThinkPad-P72
> > 
> > 3.	kfree_rcu updates.
> > 
> > 	https://lore.kernel.org/lkml/20200624201200.GA28901@paulmck-ThinkPad-P72
> > 
> > 4.	RCU tasks updates.
> > 
> > 	https://lore.kernel.org/lkml/20200623002423.GA25869@paulmck-ThinkPad-P72
> > 
> > 5.	Read-side scalability tests.
> > 
> > 	https://lore.kernel.org/lkml/20200623002941.GA26089@paulmck-ThinkPad-P72
> > 
> > 6.	SRCU updates.
> > 
> > 	https://lore.kernel.org/lkml/20200623003310.GA26539@paulmck-ThinkPad-P72
> > 
> > 7.	Torture-test updates.
> > 
> > 	https://lore.kernel.org/lkml/20200623003731.GA26717@paulmck-ThinkPad-P72
> > 
> > All of these have been subjected to the kbuild test robot and -next
> > testing, and are available in the git repository based on v5.8-rc3 at:
> > 
> >   git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git for-mingo
> > 
> > for you to fetch changes up to 13625c0a4074d3bab61b1dc70a828b574255f339:
> > 
> >   Merge branches 'doc.2020.06.29a', 'fixes.2020.06.29a', 'kfree_rcu.2020.06.29a', 'rcu-tasks.2020.06.29a', 'scale.2020.06.29a', 'srcu.2020.06.29a' and 'torture.2020.06.29a' into HEAD (2020-06-29 12:03:15 -0700)
> 
> >  61 files changed, 2395 insertions(+), 680 deletions(-)
> 
> Pulled into tip:core/rcu, thanks a lot Paul!
> 
> I assume the fix Uladzislau Rezki is working on will resolve Sebastian 
> Andrzej Siewior's objections?

One way or another, yes.  We have several options, but the nicest one
requires changes outside of RCU, so cannot be carried out in time for the
upcoming merge window.  If that fails, we have other less-nice options
that -can- be confined to RCU, at least in the short term.

But one way or another, the issue that Sebastian raised will be resolved.

							Thanx, Paul