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Message-Id: <200709081219.43662.ak@suse.de>
Date: Sat, 8 Sep 2007 12:19:43 +0200
From: Andi Kleen <ak@...e.de>
To: Nick Piggin <nickpiggin@...oo.com.au>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
Jesse Barnes <jesse.barnes@...el.com>,
linux-kernel@...r.kernel.org
Subject: Re: Intel Memory Ordering White Paper
On Friday 07 September 2007 21:57:35 Nick Piggin wrote:
>
> > > Anyway, the lfence should be able to go away without so much trouble.
> >
> > You mean sfence? lfence in rmb is definitely needed.
>
> I mean lfence in smp_rmb().
One point of rmb is to stop speculative loads and I don't think we
can get that without lfence.
-Andi
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