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Re: [Xen-devel] [PATCH v4] arm: remove !CPU_V6 and !GENERIC_ATOMIC64 build dependencies for XEN

To: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
From: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
Date: Wed, 22 Jan 2014 09:43:51 +0000
Cc: linux@xxxxxxxxxxxxxxxx, arnd@xxxxxxxx, catalin.marinas@xxxxxxx, jaccon.bastiaansen@xxxxxxxxx, will.deacon@xxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Delivery-date: Wed, 22 Jan 2014 09:44:10 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

On Tue, 2014-01-21 at 13:44 +0000, Stefano Stabellini wrote:
> Remove !GENERIC_ATOMIC64 build dependency:
> - introduce xen_atomic64_xchg
> - use it to implement xchg_xen_ulong
> 
> 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@xxxxxxxxxxxxx>

Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>



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References:
- [Xen-devel] [PATCH v4] arm: remove !CPU_V6 and !GENERIC_ATOMIC64 build dependencies for XEN
  - From: Stefano Stabellini

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