linux-kernel - Re: [PATCH LINUX v5] xen: event channel arrays are xen_ulong

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Message-ID: <20130305080845.GA19097@mudshark.cambridge.arm.com>
Date:	Tue, 5 Mar 2013 08:08:45 +0000
From:	Will Deacon <will.deacon@....com>
To:	Rob Herring <robherring2@...il.com>
Cc:	Ian Campbell <ian.campbell@...rix.com>,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>,
	"Keir (Xen.org)" <keir@....org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Tim Deegan <tim@....org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jan Beulich <JBeulich@...e.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Nicolas Pitre <nico@...xnic.net>
Subject: Re: [PATCH LINUX v5] xen: event channel arrays are xen_ulong_t and
 not unsigned long

On Tue, Mar 05, 2013 at 06:55:46AM +0000, Rob Herring wrote:
> > I also can't immediately see why GCC would allocate oldval to an odd base
> > register. Can you share your .config please?
> >
> 
> Here's a config:

[...]

Cheers Rob, that was enough to reproduce for me. The problem is likely that
CONFIG_AEABI=n, so the ABI doesn't actually mandate even base registers for
64-bit values in registers.

Ian -- this would be fixed if you used our atomic64 routines instead of
inventing your own :)

Will
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