On Tue, Jul 27, 2010 at 19:18, Andrew Morton wrote: > On Mon, 26 Jul 2010 10:49:50 +0200 Michal Simek wrote: >> start/stop_critical_timing function for preemptirqsoff, preemptoff >> and irqsoff tracers contains atomic_inc and atomic_dec operations. >> >> Atomic operations used local_irq_save/restore macros to ensure >> atomic access but they are traced by the same function which is causing >> recursion problem. >> >> The reason is when these tracers are turn ON then local_irq_save/restore >> macros are changed in include/linux/irqflags.h to call trace_hardirqs_on/off >> which call start/stop_critical_timing. >> >> Microblaze was affected because use generic atomic implementation. > > Seems that this will also affect blackfin, mn10300 and score. I guess > they aren't supporting tracing yet? do you mean TRACE_IRQFLAGS_SUPPORT ? Blackfin should ... my understanding was that arches just needed to implement asm/irqflags.h for it. -mike -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html