> From: Kjetil Oftedal <oftedal@xxxxxxxxx> > Date: Sun, 26 Dec 2010 13:34:56 +0100 > >> On 22 December 2010 23:28, David Miller <davem@xxxxxxxxxxxxx> wrote: >>> From: Daniel Hellstrom <daniel@xxxxxxxxxxx> >>> Date: Wed, 22 Dec 2010 14:23:27 +0100 >>> >>>> I will try to create a patch for the atomic layer for SMP LEON systems >>>> since they have the CASA instruction. >>> >>> But see my other posting, you still have to fix the irq15 problem. >>> >>> Merely switching to CASA doesn't mean you don't still have a problem >>> because spin_lock_irqsave() and other similar pieces of code expect >>> they will not be interrupted by smp_call_function() calls. >> >> Was SPARC32 SMP in 2.4 also implemented using IRQ15/NMI ? > > Yes, it's essentially always had this problem. > > It was less important back then because smp_call_function() was > really not used much by generic code. Now it's used everywhere. Maybe this could be why I could never get a sun4d SS1000E with 8 processors to stay up for more than a few minutes without locking solid. OTOH it could be irrelevant. -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
