linux-kernel - Re: [PATCH v3] arm: remove !CPU_V6 and !GENERIC

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Message-ID: <20140109103004.GB11089@mudshark.cambridge.arm.com>
Date:	Thu, 9 Jan 2014 10:30:05 +0000
From:	Will Deacon <will.deacon@....com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc:	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"arnd@...db.de" <arnd@...db.de>,
	"gang.chen@...anux.com" <gang.chen@...anux.com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"jaccon.bastiaansen@...il.com" <jaccon.bastiaansen@...il.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] arm: remove !CPU_V6 and !GENERIC_ATOMIC64 build
 dependencies for XEN

Hi Stefano,

On Wed, Jan 08, 2014 at 06:00:23PM +0000, Stefano Stabellini wrote:
> Remove !GENERIC_ATOMIC64 build dependency:
> - rename atomic64_xchg to armv7_atomic64_xchg and define it even ifdef
>   GENERIC_ATOMIC64;
> - call armv7_atomic64_xchg directly from xen/events.h.
> 
> Remove !CPU_V6 build dependency:
> - introduce __cmpxchg8 and __cmpxchg16, compiled even ifdef
>   CONFIG_CPU_V6;
> - implement sync_cmpxchg using __cmpxchg8 and __cmpxchg16.
> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> CC: arnd@...db.de
> CC: linux@....linux.org.uk
> CC: will.deacon@....com
> CC: gang.chen@...anux.com
> CC: catalin.marinas@....com
> CC: jaccon.bastiaansen@...il.com
> CC: linux-arm-kernel@...ts.infradead.org
> CC: linux-kernel@...r.kernel.org
> 

I'm confused here. It looks like you want to call armv7 code in a v6 kernel.
What am I missing?

Will
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