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>
Subject: [PATCH RT 11/22] kernel: migrate_disable() do fastpath in atomic & irqs-off
Date: Wed, 02 Mar 2016 10:09:10 -0500 [thread overview]
Message-ID: <20160302151112.005641091@goodmis.org> (raw)
In-Reply-To: 20160302150859.204542604@goodmis.org
[-- Attachment #1: 0011-kernel-migrate_disable-do-fastpath-in-atomic-irqs-of.patch --]
[-- Type: text/plain, Size: 1104 bytes --]
4.1.15-rt18-rc1 stable review patch.
If anyone has any objections, please let me know.
------------------
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
With interrupts off it makes no sense to do the long path since we can't
leave the CPU anyway. Also we might end up in a recursion with lockdep.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
kernel/sched/core.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 5cbfb0548574..56b6d73f9154 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2798,7 +2798,7 @@ void migrate_disable(void)
{
struct task_struct *p = current;
- if (in_atomic()) {
+ if (in_atomic() || irqs_disabled()) {
#ifdef CONFIG_SCHED_DEBUG
p->migrate_disable_atomic++;
#endif
@@ -2832,7 +2832,7 @@ void migrate_enable(void)
unsigned long flags;
struct rq *rq;
- if (in_atomic()) {
+ if (in_atomic() || irqs_disabled()) {
#ifdef CONFIG_SCHED_DEBUG
p->migrate_disable_atomic--;
#endif
--
2.7.0
next prev parent reply other threads:[~2016-03-02 15:09 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-02 15:08 [PATCH RT 00/22] Linux 4.1.15-rt18-rc1 Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 01/22] sched: reset tasks lockless wake-queues on fork() Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 02/22] ptrace: dont open IRQs in ptrace_freeze_traced() too early Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 03/22] net: move xmit_recursion to per-task variable on -RT Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 04/22] kernel/softirq: use cond_resched_rcu_qs() on -RT as well (run_ksoftirqd()) Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 05/22] net/core: protect users of napi_alloc_cache against reentrance Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 06/22] preempt-lazy: Add the lazy-preemption check to preempt_schedule() Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 07/22] softirq: split timer softirqs out of ksoftirqd Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 08/22] net: provide a way to delegate processing a softirq to ksoftirqd Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 09/22] latencyhist: disable jump-labels Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 10/22] arm64: replace read_lock to rcu lock in call_step_hook Steven Rostedt
2016-03-02 15:09 ` Steven Rostedt [this message]
2016-03-02 15:09 ` [PATCH RT 12/22] kernel: softirq: unlock with irqs on Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 13/22] kernel/stop_machine: partly revert "stop_machine: Use raw spinlocks" Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 14/22] tick/broadcast: Make broadcast hrtimer irqsafe Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 15/22] sched,rt: __always_inline preemptible_lazy() Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 16/22] drm,radeon,i915: Use preempt_disable/enable_rt() where recommended Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 17/22] drm,i915: Use local_lock/unlock_irq() in intel_pipe_update_start/end() Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 18/22] trace: Use rcuidle version for preemptoff_hist trace point Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 19/22] f2fs: Mutex cant be used by down_write_nest_lock() Steven Rostedt
2016-03-02 15:09 ` Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 20/22] rcu/torture: Comment out rcu_bh ops on PREEMPT_RT_FULL Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 21/22] kernel: sched: Fix preempt_disable_ip recodring for preempt_disable() Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 22/22] Linux 4.1.15-rt18-rc1 Steven Rostedt
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