Commit-ID: 46af29e479cc0c1c63633007993af5292c2c3e75 Gitweb: http://git.kernel.org/tip/46af29e479cc0c1c63633007993af5292c2c3e75 Author: Jason Low <jason.l...@hp.com> AuthorDate: Tue, 28 Jan 2014 11:13:12 -0800 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Tue, 11 Mar 2014 12:14:52 +0100
locking/mutexes: Return false if task need_resched() in mutex_can_spin_on_owner() 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> Signed-off-by: Peter Zijlstra <pet...@infradead.org> Cc: waiman.l...@hp.com Cc: torva...@linux-foundation.org Cc: t...@linutronix.de Cc: r...@redhat.com Cc: a...@linux-foundation.org Cc: davidl...@hp.com Cc: h...@zytor.com Cc: a...@firstfloor.org Cc: as...@hp.com Cc: scott.nor...@hp.com Cc: chegu_vi...@hp.com Cc: paul...@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/1390936396-3962-2-git-send-email-jason.l...@hp.com Signed-off-by: Ingo Molnar <mi...@kernel.org> --- kernel/locking/mutex.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/locking/mutex.c b/kernel/locking/mutex.c index 4f408be..e6d646b 100644 --- a/kernel/locking/mutex.c +++ b/kernel/locking/mutex.c @@ -166,6 +166,9 @@ 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) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
