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Date: Wed, 17 Nov 2010 01:05:22 -0800 From: Jeremy Fitzhardinge <jeremy@...p.org> To: Avi Kivity <avi@...hat.com> CC: Jan Beulich <JBeulich@...ell.com>, Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>, Eric Dumazet <dada1@...mosbay.com>, xiyou.wangcong@...il.com, Peter Zijlstra <peterz@...radead.org>, Nick Piggin <npiggin@...nel.dk>, Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>, Linux Virtualization <virtualization@...ts.linux-foundation.org>, Xen-devel <xen-devel@...ts.xensource.com>, Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, "H. Peter Anvin" <hpa@...or.com> Subject: Re: [PATCH 13/14] x86/ticketlock: add slowpath logic On 11/17/2010 12:58 AM, Avi Kivity wrote: >> Actually in this case I'm pretty sure there's already a "set bit" >> function which will do the job. set_bit(), I guess, though it takes a >> bit number rather than a mask... >> > > > set_bit() operates on a long, while the intel manuals recommend > against operating on operands of different size, especially with > locked operations. I think newer processors have more relaxed > requirements, though. Despite its prototype, set_bit() is pretty specifically using "orb" for a the constant case, or bts otherwise (I don't know what size memory operation bts is considered to generate). J -- 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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