On Fri, Oct 3, 2014 at 5:01 PM, Linus Torvalds <torva...@linux-foundation.org> wrote: > > The real fix would appear to be to use > "preempt_enable_no_resched_notrace()", which your patch did, but > without the loop.
Actually, the real fix would be to not be stupid, and just make the code do something like > if (likely(!preemptible())) > return; > > __preempt_count_add(PREEMPT_ACTIVE); > prev_ctx = exception_enter(); > > __schedule(); > > exception_exit(prev_ctx); > __preempt_count_sub(PREEMPT_ACTIVE); and *not* enable preemption around the scheduling at all. The whole enable and then re-disable seems entirely broken, and comes from the code using "preempt_schedule()" which doesn't work while preemption is disabled. So don't do that then. No? Linus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/