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 <wagi@monom.org>,
tom.zanussi@linux.intel.com
Subject: [PATCH RT 07/16] sched/core: Drop a preempt_disable_rt() statement
Date: Fri, 19 Jul 2019 17:49:38 -0400 [thread overview]
Message-ID: <20190719214957.155151346@goodmis.org> (raw)
In-Reply-To: 20190719214931.700049248@goodmis.org
4.19.59-rt24-rc1 stable review patch.
If anyone has any objections, please let me know.
------------------
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
[ Upstream commit 761126efdcbe3fa3e99c9079fa0ad6eca2f251f2 ]
The caller holds a lock which already disables preemption.
Drop the preempt_disable_rt() statement in get_nohz_timer_target().
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
kernel/sched/core.c | 9 ++-------
1 file changed, 2 insertions(+), 7 deletions(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 91a9b2556fb0..1b2503b87473 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -558,14 +558,11 @@ void resched_cpu(int cpu)
*/
int get_nohz_timer_target(void)
{
- int i, cpu;
+ int i, cpu = smp_processor_id();
struct sched_domain *sd;
- preempt_disable_rt();
- cpu = smp_processor_id();
-
if (!idle_cpu(cpu) && housekeeping_cpu(cpu, HK_FLAG_TIMER))
- goto preempt_en_rt;
+ return cpu;
rcu_read_lock();
for_each_domain(cpu, sd) {
@@ -584,8 +581,6 @@ int get_nohz_timer_target(void)
cpu = housekeeping_any_cpu(HK_FLAG_TIMER);
unlock:
rcu_read_unlock();
-preempt_en_rt:
- preempt_enable_rt();
return cpu;
}
--
2.20.1
next prev parent reply other threads:[~2019-07-19 21:50 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-19 21:49 [PATCH RT 00/16] Linux 4.19.59-rt24-rc1 Steven Rostedt
2019-07-19 21:49 ` [PATCH RT 01/16] kthread: add a global worker thread Steven Rostedt
2019-07-22 8:30 ` Juri Lelli
2019-07-23 18:54 ` Steven Rostedt
2019-07-19 21:49 ` [PATCH RT 02/16] genirq: Do not invoke the affinity callback via a workqueue on RT Steven Rostedt
2019-07-19 21:49 ` [PATCH RT 03/16] genirq: Handle missing work_struct in irq_set_affinity_notifier() Steven Rostedt
2019-07-19 21:49 ` [PATCH RT 04/16] arm: imx6: cpuidle: Use raw_spinlock_t Steven Rostedt
2019-07-19 21:49 ` [PATCH RT 05/16] rcu: Dont allow to change rcu_normal_after_boot on RT Steven Rostedt
2019-07-19 21:49 ` [PATCH RT 06/16] pci/switchtec: fix stream_open.cocci warnings Steven Rostedt
2019-07-19 21:49 ` Steven Rostedt [this message]
2019-07-19 21:49 ` [PATCH RT 08/16] timers: Redo the notification of canceling timers on -RT Steven Rostedt
2019-07-19 21:49 ` [PATCH RT 09/16] Revert "futex: Ensure lock/unlock symetry versus pi_lock and hash bucket lock" Steven Rostedt
2019-07-19 21:49 ` [PATCH RT 10/16] Revert "futex: Fix bug on when a requeued RT task times out" Steven Rostedt
2019-07-19 21:49 ` [PATCH RT 11/16] Revert "rtmutex: Handle the various new futex race conditions" Steven Rostedt
2019-07-19 21:49 ` [PATCH RT 12/16] Revert "futex: workaround migrate_disable/enable in different context" Steven Rostedt
2019-07-19 21:49 ` [PATCH RT 13/16] futex: Make the futex_hash_bucket lock raw Steven Rostedt
2019-07-19 21:49 ` [PATCH RT 14/16] futex: Delay deallocation of pi_state Steven Rostedt
2019-07-19 21:49 ` [PATCH RT 15/16] mm/zswap: Do not disable preemption in zswap_frontswap_store() Steven Rostedt
2019-07-19 21:49 ` [PATCH RT 16/16] Linux 4.19.59-rt24-rc1 Steven Rostedt
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