linux-kernel - [PATCH RT 2/6] kernel: migrate_disable() do fastpath in atomic & irqs-off

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Date:	Sat, 13 Feb 2016 00:02:44 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	linux-rt-users@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	Steven Rostedt <rostedt@...dmis.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH RT 2/6] kernel: migrate_disable() do fastpath in atomic & irqs-off

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@...utronix.de>
---
 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 1217926b500d..40c1e29416c0 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3157,7 +3157,7 @@ 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
@@ -3188,7 +3188,7 @@ void migrate_enable(void)
 {
 	struct task_struct *p = current;
 
-	if (in_atomic()) {
+	if (in_atomic() || irqs_disabled()) {
 #ifdef CONFIG_SCHED_DEBUG
 		p->migrate_disable_atomic--;
 #endif
-- 
2.7.0