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> --- 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
