linux-kernel - Re: Non atomic unaligned writes

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Date:	Sun, 19 Aug 2007 22:03:13 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Andi Kleen <ak@...e.de>, patches@...-64.org,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Zachary Amsden <zach@...are.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org,
	"S. P. Prasanna" <prasanna@...ibm.com>,
	Chris Wright <chrisw@...s-sol.org>
Subject: Re: Non atomic unaligned writes


> > > Are misaligned/cross-cache-line updates atomic?
> > 
> > In theory yes, in practice there can be errata of course. 

Afaik the theory is "Platform specific; most x86 will be in practice";
it's up to the system vendor and chipset vendor. 

The practice is "mixed ball, slow as h*ck anyway, just never ever do it"


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