On Mon, Feb 10, 2014 at 08:58:22PM +0100, Peter Zijlstra wrote: Bah, I forgot Quilt eats the From: headers and I forgot to re-add them. They're still present in the queue, just lost in mailing :/
> 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. > > Cc: chegu_vi...@hp.com > Cc: paul...@linux.vnet.ibm.com > 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: mi...@kernel.org > Cc: scott.nor...@hp.com > Signed-off-by: Jason Low <jason.l...@hp.com> > Signed-off-by: Peter Zijlstra <pet...@infradead.org> > Link: > http://lkml.kernel.org/r/1390936396-3962-2-git-send-email-jason.l...@hp.com > --- > kernel/locking/mutex.c | 3 +++ > 1 file changed, 3 insertions(+) > > --- a/kernel/locking/mutex.c > +++ b/kernel/locking/mutex.c > @@ -166,6 +166,9 @@ static inline int mutex_can_spin_on_owne > 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/
