On Fri, Jun 06, 2014 at 05:06:07PM +0200, Peter Zijlstra wrote: > On Mon, Jun 02, 2014 at 10:09:35AM -0700, Linus Torvalds wrote: > > On Mon, Jun 2, 2014 at 9:25 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote: > > > > > > And I can't say I'm a particular fan of these ops either, as alternative > > > I'm almost inclined to just exclude parisc from using opt spinning. > > > > Please do. > > Something like so; if the rwsem stuff lands in .15 we need more for > that, it doesn't have a convenient CONFIG symbol like this. > > Linus will you take this from email, or should I get it through > tip/locking/urgent or so? > > --- > Subject: locking, mutex: Disable optimistic spinning for PA-RISC > > PA-RISC's cmpxchg is not save against normal stores and the code used > for optimistic spinning is known broken because of this. > > Disable for now. > > Reported-by: Mikulas Patocka <mpatocka@xxxxxxxxxx> > Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Reviewed-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> > --- > kernel/Kconfig.locks | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/kernel/Kconfig.locks b/kernel/Kconfig.locks > index 35536d9c0964..9c239e080c2d 100644 > --- a/kernel/Kconfig.locks > +++ b/kernel/Kconfig.locks > @@ -222,7 +222,7 @@ endif > > config MUTEX_SPIN_ON_OWNER > def_bool y > - depends on SMP && !DEBUG_MUTEXES > + depends on SMP && !DEBUG_MUTEXES && !PARISC > > config ARCH_USE_QUEUE_RWLOCK > bool > -- To unsubscribe from this list: send the line "unsubscribe linux-parisc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
