From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org,
linux-rt-users <linux-rt-users@vger.kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Carsten Emde <C.Emde@osadl.org>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
John Kacur <jkacur@redhat.com>,
Paul Gortmaker <paul.gortmaker@windriver.com>,
Julia Cartwright <julia@ni.com>,
Daniel Wagner <daniel.wagner@siemens.com>,
tom.zanussi@linux.intel.com, Alex Shi <alex.shi@linaro.org>
Subject: [PATCH RT 06/15] PM / CPU: replace raw_notifier with atomic_notifier (fixup)
Date: Fri, 01 Dec 2017 10:48:43 -0500 [thread overview]
Message-ID: <20171201154912.315922141@goodmis.org> (raw)
In-Reply-To: 20171201154837.379265211@goodmis.org
[-- Attachment #1: 0006-PM-CPU-replace-raw_notifier-with-atomic_notifier-fix.patch --]
[-- Type: text/plain, Size: 1030 bytes --]
4.9.65-rt57-rc1 stable review patch.
If anyone has any objections, please let me know.
------------------
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
The original patch changed betwen its posting and what finally went into
Rafael's tree so here is the delta.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
kernel/cpu_pm.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/kernel/cpu_pm.c b/kernel/cpu_pm.c
index 10f4640f991e..67b02e138a47 100644
--- a/kernel/cpu_pm.c
+++ b/kernel/cpu_pm.c
@@ -28,8 +28,15 @@ static int cpu_pm_notify(enum cpu_pm_event event, int nr_to_call, int *nr_calls)
{
int ret;
+ /*
+ * __atomic_notifier_call_chain has a RCU read critical section, which
+ * could be disfunctional in cpu idle. Copy RCU_NONIDLE code to let
+ * RCU know this.
+ */
+ rcu_irq_enter_irqson();
ret = __atomic_notifier_call_chain(&cpu_pm_notifier_chain, event, NULL,
nr_to_call, nr_calls);
+ rcu_irq_exit_irqson();
return notifier_to_errno(ret);
}
--
2.13.2
next prev parent reply other threads:[~2017-12-01 15:49 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-01 15:48 [PATCH RT 00/15] Linux Steven Rostedt
2017-12-01 15:48 ` [PATCH RT 01/15] Revert "memcontrol: Prevent scheduling while atomic in cgroup code" Steven Rostedt
2017-12-01 15:48 ` [PATCH RT 02/15] Revert "fs: jbd2: pull your plug when waiting for space" Steven Rostedt
2017-12-01 15:48 ` [PATCH RT 03/15] rtmutex: Fix lock stealing logic Steven Rostedt
2017-12-01 15:48 ` [PATCH RT 04/15] posixtimer: init timer only with CONFIG_POSIX_TIMERS enabled Steven Rostedt
2017-12-01 15:48 ` [PATCH RT 05/15] cpu_pm: replace raw_notifier to atomic_notifier Steven Rostedt
2017-12-01 15:48 ` Steven Rostedt [this message]
2017-12-01 15:48 ` [PATCH RT 07/15] kernel/hrtimer: migrate deferred timer on CPU down Steven Rostedt
2017-12-01 15:48 ` [PATCH RT 08/15] net: take the tcp_sk_lock lock with BH disabled Steven Rostedt
2017-12-01 15:48 ` [PATCH RT 09/15] kernel/hrtimer: dont wakeup a process while holding the hrtimer base lock Steven Rostedt
2017-12-01 15:48 ` [PATCH RT 10/15] kernel/hrtimer/hotplug: dont wake ktimersoftd " Steven Rostedt
2017-12-01 15:48 ` [PATCH RT 11/15] Bluetooth: avoid recursive locking in hci_send_to_channel() Steven Rostedt
2017-12-01 15:48 ` [PATCH RT 12/15] iommu/amd: Use raw_cpu_ptr() instead of get_cpu_ptr() for ->flush_queue Steven Rostedt
2017-12-01 15:48 ` Steven Rostedt
2017-12-01 15:48 ` [PATCH RT 13/15] rt/locking: allow recursive local_trylock() Steven Rostedt
2017-12-01 15:51 ` [PATCH RT 00/15] Linux Steven Rostedt
-- strict thread matches above, loose matches on Subject: below --
2017-12-01 15:49 [PATCH RT 00/15] Linux 4.9.65-rt57-rc1 Steven Rostedt
2017-12-01 15:50 ` [PATCH RT 06/15] PM / CPU: replace raw_notifier with atomic_notifier (fixup) Steven Rostedt
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