On Thu, May 23, 2013 at 03:28:36PM +0200, Manuel Lauss wrote: > Only an interrupt can wake the core from 'wait', enable interrupts > locally before executing 'wait'. > > Signed-off-by: Manuel Lauss <manuel.lauss@xxxxxxxxx> > --- > Ralf made me aware of the race in between enabling interrupts and > entering wait. While this patch does not eliminate it, it shrinks it > to 1 instruction. It's not perfect, but lets Alchemy boot until a > more sophisticated solution (like __r4k_wait) can be implemented > without having to duplicate the interrupt exception handler. It doesn't shrink it - interrupts will be pending from the time they were disabled to the point where they get re-enabled. That can be quite a few cycles and so the likelyhood for hitting the race is not that low. Ralf
