From: Valentin Schneider <valentin.schneider@arm.com>
To: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-rt-users@vger.kernel.org
Cc: 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>,
"Paul E. McKenney" <paulmck@kernel.org>,
Josh Triplett <josh@joshtriplett.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
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>,
Ard Biesheuvel <ardb@kernel.org>
Subject: [PATCH 0/3] sched: migrate_disable() vs per-CPU access safety checks
Date: Wed, 21 Jul 2021 12:51:15 +0100 [thread overview]
Message-ID: <20210721115118.729943-1-valentin.schneider@arm.com> (raw)
Hi folks,
I've hit a few warnings when taking v5.13-rt1 out for a spin on my arm64
Juno. Those are due to regions that become preemptible under PREEMPT_RT, but
remain safe wrt per-CPU accesses due to migrate_disable() + a sleepable lock.
This adds a helper that looks at not just preemptability but also affinity and
migrate disable, and plasters the warning sites.
Cheers,
Valentin
Valentin Schneider (3):
sched: Introduce is_pcpu_safe()
rcu/nocb: Check for migratability rather than pure preemptability
arm64: mm: Make arch_faults_on_old_pte() check for migratability
arch/arm64/include/asm/pgtable.h | 2 +-
include/linux/sched.h | 10 ++++++++++
kernel/rcu/tree_plugin.h | 3 +--
3 files changed, 12 insertions(+), 3 deletions(-)
--
2.25.1
next reply other threads:[~2021-07-21 12:01 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-21 11:51 Valentin Schneider [this message]
2021-07-21 11:51 ` [PATCH 1/3] sched: Introduce is_pcpu_safe() Valentin Schneider
2021-07-27 16:23 ` Paul E. McKenney
2021-07-21 11:51 ` [PATCH 2/3] rcu/nocb: Check for migratability rather than pure preemptability Valentin Schneider
2021-07-27 16:24 ` Paul E. McKenney
2021-07-27 23:08 ` Frederic Weisbecker
2021-07-28 19:34 ` Valentin Schneider
2021-07-28 22:01 ` Frederic Weisbecker
2021-07-29 1:04 ` Paul E. McKenney
2021-07-29 10:51 ` Valentin Schneider
2021-07-21 11:51 ` [PATCH 3/3] arm64: mm: Make arch_faults_on_old_pte() check for migratability Valentin Schneider
2021-07-27 19:45 ` [PATCH 0/3] sched: migrate_disable() vs per-CPU access safety checks Thomas Gleixner
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