On Wed, 25 Jan 2012, Mike Galbraith wrote: > On Tue, 2012-01-24 at 10:04 -0600, Sankara Muthukrishnan wrote: > spin_unlock_irq(&ctx->wqh.lock); > +#ifndef CONFIG_PREEMPT_RT_BASE Bah. > cpu_relax(); > +#else > + /* > + * Current may be an RT task with priority high enough > + * to prevent the thread currently _wanting_ to execute > + * the timer callback function from receiving the CPU. > + */ > + usleep_range(1, 10); Even more bah. > +#endif > } Index: linux-3.2/fs/timerfd.c =================================================================== --- linux-3.2.orig/fs/timerfd.c +++ linux-3.2/fs/timerfd.c @@ -313,7 +313,7 @@ SYSCALL_DEFINE4(timerfd_settime, int, uf if (hrtimer_try_to_cancel(&ctx->tmr) >= 0) break; spin_unlock_irq(&ctx->wqh.lock); - cpu_relax(); + hrtimer_wait_for_timer(&ctx->tmr); } /* -- 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
