linux-kernel - Re: [PATCH 5/9] ARM: Xen: fix initial build problems:

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Date:	Tue, 9 Oct 2012 16:37:01 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Russell King <rmk+kernel@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>
Subject: Re: [PATCH 5/9] ARM: Xen: fix initial build problems:

Thanks for the patch and sorry for the build breakage!

On Tue, 9 Oct 2012, Arnd Bergmann wrote:
> * The XEN_BALLOON code requires the balloon infrastructure that is not
>   getting built on ARM.
> 
> * The tmem hypercall is not available on ARM
> 
> * ARMv6 does not support cmpxchg on 16-bit words that are used in the
> 
> * sys-hypervisor.c needs to include linux/err.h in order to use the
>   IS_ERR/PTR_ERR/ERR_PTR family of functions.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Cc: Stefano Stabellini <stefano.stabellini@...citrix.com>
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> Cc: Jeremy Fitzhardinge <jeremy@...p.org>
> Cc: xen-devel@...ts.xensource.com
> ---
>  arch/arm/Kconfig             |    1 +
>  drivers/xen/Kconfig          |    2 ++
>  drivers/xen/sys-hypervisor.c |    1 +
>  3 files changed, 4 insertions(+)
> 
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 6d2f7f5..85eaac3 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -1846,6 +1846,7 @@ config XEN_DOM0
>  config XEN
>  	bool "Xen guest support on ARM (EXPERIMENTAL)"
>  	depends on EXPERIMENTAL && ARM && OF
> +	depends on !CPU_V6
>  	help
>  	  Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.

Considering that we rely on the virtualization extensions, this one can
be:

    depends on CPU_V7

The rest looks fine. I can submit a second patch to change !CPU_V6 into
CPU_V7 later, if you prefer.


> diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
> index d4dffcd..126d8ce 100644
> --- a/drivers/xen/Kconfig
> +++ b/drivers/xen/Kconfig
> @@ -3,6 +3,7 @@ menu "Xen driver support"
>  
>  config XEN_BALLOON
>  	bool "Xen memory balloon driver"
> +	depends on !ARM
>  	default y
>  	help
>  	  The balloon driver allows the Xen domain to request more memory from
> @@ -145,6 +146,7 @@ config SWIOTLB_XEN
>  
>  config XEN_TMEM
>  	bool
> +	depends on !ARM
>  	default y if (CLEANCACHE || FRONTSWAP)
>  	help
>  	  Shim to interface in-kernel Transcendent Memory hooks
>
> diff --git a/drivers/xen/sys-hypervisor.c b/drivers/xen/sys-hypervisor.c
> index 5e5ad7e..66a0a14 100644
> --- a/drivers/xen/sys-hypervisor.c
> +++ b/drivers/xen/sys-hypervisor.c
> @@ -11,6 +11,7 @@
>  #include <linux/kernel.h>
>  #include <linux/module.h>
>  #include <linux/kobject.h>
> +#include <linux/err.h>
>  
>  #include <asm/xen/hypervisor.h>
>  #include <asm/xen/hypercall.h>
> -- 
> 1.7.10
> 
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