linux-kernel - Re: [RFC PATCH 28/33] Add Xen grant table support

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Message-Id: <C39255BB-9E63-4EB6-BE9D-4CD32F830585@kernel.crashing.org>
Date:	Tue, 25 Jul 2006 21:06:51 +0200
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	Hollis Blanchard <hollisb@...ibm.com>
Cc:	Chris Wright <chrisw@...s-sol.org>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...l.org>, virtualization@...ts.osdl.org,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	xen-devel@...ts.xensource.com, Ian Pratt <ian.pratt@...source.com>,
	xen-ppc-devel <xen-ppc-devel@...ts.xensource.com>
Subject: Re: [RFC PATCH 28/33] Add Xen grant table support

> I object to these uses of (synch_)cmpxchg on a uint16_t in common  
> code.
> Many architectures, including PowerPC, do not support 2-byte atomic
> operations, but this code is common to all Xen architectures.

RMW operations you mean, I suppose.  On PowerPC, all (naturally
aligned) halfword operations are atomic; there do not exist any
RMW operations; but word and doubleword atomic RMW operations
can be emulated.

Boils down to the same thing of course, but it isn't the same ;-)


Segher

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