From: Ben Hutchings <ben@xxxxxxxxxxxxxxx> Date: Sat, 07 Apr 2012 18:21:38 +0100 > cheetah_xcall_deliver() does appear to be relevant to the problem and it > looks like it could loop indefinitely - though presumably only if a > processor is behaving strangely? I can only loop indefinitely if one of the cpus is hung and does not respond to the cross-call interrupt. > It appears to periodically enable and disable interrupts, but then > I'm not sure how the PSTATE.IE and PIL interrupt control fields > interact and I don't think this will reset the NMI watchdog. PSTATE.IE controls delivery of all interrupts, both PIL based and vectored interrupts. PIL only controls delivery of PIL interrupts. The NMI watchdog interrupt is a special PIL interrupt, and most of the standard local_irq_disable() et al. routines on sparc will adjust the %pil such that NMI watchdog interrupts are still delivered. See include/asm/pil.h for details. -- 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
