linux-kernel - Re: [patch 2/8] Implement always-locked bit ops, for memory shared with an SMP hypervisor.

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Message-ID: <Pine.LNX.4.64.0608030943110.29745@schroedinger.engr.sgi.com>
Date:	Thu, 3 Aug 2006 09:49:58 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andi Kleen <ak@...e.de>
cc:	virtualization@...ts.osdl.org,
	Jeremy Fitzhardinge <jeremy@...p.org>, akpm@...l.org,
	xen-devel@...ts.xensource.com, Chris Wright <chrisw@...s-sol.org>,
	Ian Pratt <ian.pratt@...source.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 2/8] Implement always-locked bit ops, for memory shared
 with an SMP hypervisor.

On Thu, 3 Aug 2006, Andi Kleen wrote:

> On Thursday 03 August 2006 07:54, Christoph Lameter wrote:
> > On Thu, 3 Aug 2006, Andi Kleen wrote:
> > 
> > > > I still wonder why you are so focused on ifdefs. Why would we need those?
> > > 
> > > Because the Xen drivers will run on a couple of architectures, including
> > > IA64 and PPC.
> > > 
> > > If IA64 or PPC didn't implement at least wrappers for the sync ops
> > > then they would all need special ifdefs to handle this.
> > 
> > No they would just need to do an #include <xen-bitops.h>
> 
> If IA64 and PPC64 wouldn't have xen-bitops.h (which you seem to argue 
> for) then they would need ifdefs.

An include <asm/xen-bitops.h> would need to fall back to asm-generic if
there is no file in asm-arch/xen-bitops.h. I thought we had such a 
mechanism?

> You mean into asm-generic/bitops.h? Then it would need ifdefs
> to handle the i386/x86-64 case.

No. Into asm-generic/xen-bitops.h.
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