On Thu, 18 Oct 2012, Oleg Nesterov wrote:
> Ooooh. And I just noticed include/linux/percpu-rwsem.h which does > something similar. Certainly it was not in my tree when I started > this patch... percpu_down_write() doesn't allow multiple writers, > but the main problem it uses msleep(1). It should not, I think. synchronize_rcu() can sleep for hundred milliseconds, so msleep(1) is not a big problem. > But. It seems that percpu_up_write() is equally wrong? Doesn't > it need synchronize_rcu() before "p->locked = false" ? Yes, it does ... and I sent patch for that to Linus. > (add Mikulas) > > Oleg. Mikulas -- 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/
