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Date: Fri, 08 Oct 2021 15:03:02 +0100 From: Valentin Schneider <valentin.schneider@....com> To: Frederic Weisbecker <frederic@...nel.org>, "Paul E . McKenney" <paulmck@...nel.org> Cc: LKML <linux-kernel@...r.kernel.org>, Frederic Weisbecker <frederic@...nel.org>, Sebastian Andrzej Siewior <bigeasy@...utronix.de>, Peter Zijlstra <peterz@...radead.org>, Uladzislau Rezki <urezki@...il.com>, Thomas Gleixner <tglx@...utronix.de>, Boqun Feng <boqun.feng@...il.com>, Neeraj Upadhyay <neeraju@...eaurora.org>, Josh Triplett <josh@...htriplett.org>, Joel Fernandes <joel@...lfernandes.org>, rcu@...r.kernel.org Subject: Re: [PATCH 00/11] rcu: Make rcu_core() safe in PREEMPT_RT with NOCB + a few other fixes On 01/10/21 18:47, Valentin Schneider wrote: > On 30/09/21 00:10, Frederic Weisbecker wrote: >> PREEMPT_RT has made rcu_core() preemptible, making it unsafe against >> concurrent NOCB (de-)offloading. >> >> Thomas suggested to drop the local_lock() based solution and simply >> check the offloaded state while context looks safe but that's not >> enough. Here is a bit of rework. >> >> git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git >> rcu/rt >> >> HEAD: aac1c58961446c731f2e989bd822ca1fd2659bad >> >> Thanks, >> Frederic > > FWIW I've had RCU torture with NOCB toggling running for half a day on my > Arm Juno and nothing to report. I still need to rebase this on an -rt tree > and give it a spin with CONFIG_PREEMPT_RT. Rebased on top of v5.15-rc4-rt7-rebase with Thomas' patch reverted and ran the same thing under CONFIG_PREEMPT_RT, nothing seems to catch on fire, so: Tested-by: Valentin Schneider <valentin.schneider@....com>
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