Where did the arm ep93xx changes come from? It looks like patch below came in with them in 2.6.21-rt6 .. --- linux.orig/include/asm-arm/system.h +++ linux/include/asm-arm/system.h @@ -235,8 +235,9 @@ static inline void set_copro_access(unsi * so enable interrupts over the context switch to avoid high * latency. */ +#if 0 // preempt_rt hack, because warn_on in shedule.c triggers #define __ARCH_WANT_INTERRUPTS_ON_CTXSW - +#endif /* * switch_to(prev, next) should switch from task `prev' to `next' * `prev' will never be the same as `next'. schedule() itself - To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html