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From:   Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To:     "Paul E. McKenney" <paulmck@kernel.org>
Cc:     Valentin Schneider <valentin.schneider@arm.com>,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        rcu@vger.kernel.org, linux-rt-users@vger.kernel.org,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>, Ingo Molnar <mingo@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Steven Rostedt <rostedt@goodmis.org>,
        Daniel Bristot de Oliveira <bristot@redhat.com>,
        Frederic Weisbecker <frederic@kernel.org>,
        Josh Triplett <josh@joshtriplett.org>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        Davidlohr Bueso <dave@stgolabs.net>,
        Lai Jiangshan <jiangshanlai@gmail.com>,
        Joel Fernandes <joel@joelfernandes.org>,
        Anshuman Khandual <anshuman.khandual@arm.com>,
        Vincenzo Frascino <vincenzo.frascino@arm.com>,
        Steven Price <steven.price@arm.com>,
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        Boqun Feng <boqun.feng@gmail.com>,
        Mike Galbraith <efault@gmx.de>, Scott Wood <swood@redhat.com>
Subject: Re: [PATCH] rcutorture: Avoid problematic critical section nesting
 on RT
Message-ID: <20210819184523.laa5vwvfsgotbgx5@linutronix.de>
References: <20210811201354.1976839-1-valentin.schneider@arm.com>
 <20210811201354.1976839-2-valentin.schneider@arm.com>
 <20210817121345.5iyj5epemczn3a52@linutronix.de>
 <20210817131741.evduh4fw7vyv2dzt@linutronix.de>
 <20210817144018.nqssoq475vitrqlv@linutronix.de>
 <20210818224651.GY4126399@paulmck-ThinkPad-P17-Gen-1>
 <20210819153927.clqxr4f7qegpflbr@linutronix.de>
 <20210819154708.3efz6jtgwtuhpeds@linutronix.de>
 <20210819182035.GF4126399@paulmck-ThinkPad-P17-Gen-1>
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On 2021-08-19 11:20:35 [-0700], Paul E. McKenney wrote:
> > This piece above, I don't understand. I had it running for a while and
> > it didn't explode. Let me try TREE01 for 30min without that piece.
>=20
> This might be historical.  There was a time when interrupts being
> disabled across rcu_read_unlock() meant that preemption had to have
> been disabled across the entire RCU read-side critical section.
>=20
> I am not seeing a purpose for it now, but I could easily be missing
> something, especially given my tenuous grasp of RT.

Okay. So the 30min test didn't trigger any warnings=E2=80=A6

> Either way, looking forward to the next version!

Good. So if you liked what you have seen then I'm going to resubmit the
above as a proper patch then.
Thanks!

> 							Thanx, Paul

Sebastian