linux-kernel - RE: Serious problem with ticket spinlocks on ia64

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Message-ID: <987664A83D2D224EAE907B061CE93D53015D91D3B7@orsmsx505.amr.corp.intel.com>
Date:	Fri, 27 Aug 2010 13:29:41 -0700
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Petr Tesarik <ptesarik@...e.cz>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Hedi Berriche <hedi@....com>
Subject: RE: Serious problem with ticket spinlocks on ia64

> If this is a memory ordering problem (and that seems quite plausible)
> then a liberal sprinkling of "ia64_mf()" calls throughout the spinlock
> routines would probably make it go away.

I think I take this back ... if it were a memory ordering problem, then
it could show up any time - not just at wrap-around.

-Tony
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