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

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Message-ID: <987664A83D2D224EAE907B061CE93D53015D91D45F@orsmsx505.amr.corp.intel.com>
Date:	Fri, 27 Aug 2010 14:11:55 -0700
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Petr Tesarik <ptesarik@...e.cz>
CC:	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Hedi Berriche <hedi@....com>
Subject: RE: Serious problem with ticket spinlocks on ia64

> One more idea. The wrap-around case is the only one when the high word is 
> modified. This is in fact the only case when the fetchadd.acq competes with 
> the st2.rel about the actual contents of that location. I don't know if it 
> matters...

I pondered that for a while - but I have difficulty believing that
fetchadd looks at which bits changed and only writes back the bytes
that did.

-Tony
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