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Date: Thu, 17 Apr 2014 17:51:15 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Waiman Long <Waiman.Long@...com> Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>, linux-arch@...r.kernel.org, x86@...nel.org, linux-kernel@...r.kernel.org, virtualization@...ts.linux-foundation.org, xen-devel@...ts.xenproject.org, kvm@...r.kernel.org, Paolo Bonzini <paolo.bonzini@...il.com>, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Rik van Riel <riel@...hat.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>, David Vrabel <david.vrabel@...rix.com>, Oleg Nesterov <oleg@...hat.com>, Gleb Natapov <gleb@...hat.com>, Scott J Norton <scott.norton@...com>, Chegu Vinod <chegu_vinod@...com> Subject: Re: [PATCH v9 05/19] qspinlock: Optimize for smaller NR_CPUS On Thu, Apr 17, 2014 at 11:03:57AM -0400, Waiman Long wrote: > @@ -48,6 +53,9 @@ > * We can further change the first spinner to spin on a bit in the lock word > * instead of its node; whereby avoiding the need to carry a node from lock to > * unlock, and preserving API. > + * > + * N.B. The current implementation only supports architectures that allow > + * atomic operations on smaller 8-bit and 16-bit data types. > */ Only for the _Q_PENDING_BITS == 8 case, the other case should still be fine. -- 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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