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Subject[PATCH RT 2/7] kernel: migrate_disable() do fastpath in atomic & irqs-off
3.2.77-rt112-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.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index a9f6d6c0ab93..24d7256ce0b2 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4611,7 +4611,7 @@ 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
@@ -4642,7 +4642,7 @@ 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

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