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Date: Tue, 10 Dec 2013 17:24:11 +0100 From: Peter Zijlstra <peterz@...radead.org> To: Davidlohr Bueso <davidlohr@...com> Cc: linux-kernel@...r.kernel.org, mingo@...nel.org, dvhart@...ux.intel.com, tglx@...utronix.de, paulmck@...ux.vnet.ibm.com, efault@....de, jeffm@...e.com, torvalds@...ux-foundation.org, scott.norton@...com, tom.vaden@...com, aswin@...com, Waiman.Long@...com, jason.low2@...com Subject: Re: [PATCH v2 4/4] futex: Avoid taking hb lock if nothing to wakeup On Tue, Dec 03, 2013 at 01:45:27AM -0800, Davidlohr Bueso wrote: > @@ -203,6 +221,9 @@ static const struct futex_q futex_q_init = { > * waiting on a futex. > */ > struct futex_hash_bucket { > +#ifdef CONFIG_SMP > + atomic_t waiters; > +#endif > spinlock_t lock; > struct plist_head chain; > } ____cacheline_aligned_in_smp; > @@ -2805,6 +2906,9 @@ static int __init futex_init(void) > for (i = 0; i < futex_hashsize; i++) { > plist_head_init(&futex_queues[i].chain); > spin_lock_init(&futex_queues[i].lock); > +#ifdef CONFIG_SMP > + atomic_set(&futex_queues[i].waiters, 0); > +#endif > } > > return 0; Just remove those two #ifdefs, its not like the data structure size matters at this point. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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