The mutex_can_spin_on_owner() function should also return false if the
task needs to be rescheduled to avoid entering the MCS queue when it
needs to reschedule.
Signed-off-by: Jason Low <jason.l...@hp.com>
---
kernel/locking/mutex.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/kernel/locking/mutex.c b/kernel/locking/mutex.c
index 4dd6e4c..85c6be1 100644
--- a/kernel/locking/mutex.c
+++ b/kernel/locking/mutex.c
@@ -212,6 +212,9 @@ static inline int mutex_can_spin_on_owner(struct mutex
*lock)
struct task_struct *owner;
int retval = 1;
+ if (need_resched())
+ return 0;
+
rcu_read_lock();
owner = ACCESS_ONCE(lock->owner);
if (owner)
--
1.7.1
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