[PATCH RT 2/6] kernel: migrate_disable() do fastpath in atomic & irqs-off
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: 2016-02-12 23:03:35
Also in:
lkml
Subsystem:
scheduler, the rest · Maintainers:
Ingo Molnar, Peter Zijlstra, Juri Lelli, Vincent Guittot, Linus Torvalds
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> --- 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