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Message-ID: <alpine.DEB.2.11.1406171345240.21931@gentwo.org> Date: Tue, 17 Jun 2014 13:47:01 -0500 (CDT) From: Christoph Lameter <cl@...two.org> To: Linus Torvalds <torvalds@...ux-foundation.org> cc: Paul McKenney <paulmck@...ux.vnet.ibm.com>, Rusty Russell <rusty@...tcorp.com.au>, Andrew Morton <akpm@...ux-foundation.org>, Tejun Heo <tj@...nel.org>, David Howells <dhowells@...hat.com>, linux-kernel@...r.kernel.org, Oleg Nesterov <oleg@...hat.com> Subject: Re: [PATCH RFC] percpu: add data dependency barrier in percpu accessors and operations On Tue, 17 Jun 2014, Linus Torvalds wrote: > On Jun 17, 2014 6:28 AM, "Christoph Lameter" <cl@...two.org> wrote: > > > > Even alpha maintains the illusion of changes becoming visible in the > > proper order for the currently executing thread. No barriers are needed. > > No Christoph, alpha really doesn't. Barriers needed. Everythig breaks if a single hardware execution thread can no longer observe a consistent view of the world of the data it modifies. We are not talking about synchronization here between multiple hardware threads. This is simply code running on a single hardware thread and all architectures maintain the uniprocessor illusion there. -- 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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