linux-kernel - Re: linux-next: build failure after merge of the final tree (xen tree related)

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Message-ID: <4C4DD085.1030309@goop.org>
Date:	Mon, 26 Jul 2010 11:14:29 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
CC:	Stephen Rothwell <sfr@...b.auug.org.au>,
	Xen Devel <Xen-devel@...ts.xensource.com>,
	"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Sheng Yang <sheng@...ux.intel.com>
Subject: Re: linux-next: build failure after merge of the final tree (xen
 tree related)

  On 07/26/2010 10:57 AM, Stefano Stabellini wrote:
> On Mon, 26 Jul 2010, Jeremy Fitzhardinge wrote:
>>    On 07/26/2010 03:43 AM, Stefano Stabellini wrote:
>>> On Mon, 26 Jul 2010, Stephen Rothwell wrote:
>>>> Hi all,
>>>>
>>>> After merging the final tree, today's linux-next build (i386 defconfig)
>>>> failed like this:
>>>>
>>>> arch/x86/built-in.o: In function `init_hypervisor_platform':
>>>> (.init.text+0x3ca4): undefined reference to `x86_hyper_xen_hvm'
>>>> arch/x86/built-in.o: In function `init_hypervisor_platform':
>>>> (.init.text+0x3cad): undefined reference to `x86_hyper_xen_hvm'
>>>>
>>>> Caused by commit bee6ab53e652a414af20392899879b58cd80d033 ("x86: early PV
>>>> on HVM features initialization").
>>>>
>>>> I reverted commit 4b9100d12d15c0eaf23d9edc86228e1bdf452dc2 ("Merge branch
>>>> 'upstream/pvhvm' into upstream/xen") for today (since there were
>>>> dependencies on the above commit).
>>> The problem is that x86_hyper_xen_hvm is in arch/x86/xen/enlighten.c,
>>> that is compiled only when CONFIG_XEN is enabled.
>>> The appended patch fixes the issue moving x86_hyper_xen_hvm to
>>> arch/x86/kernel/cpu/xen.c that is always compiled.
>>>
>>> An shorter alternative solution would be just to ifdef CONFIG_XEN
>>> x86_hyper_xen_hvm in arch/x86/kernel/cpu/hypervisor.c.
>> Seems like the most sensible thing to do.  What's the point in detecting
>> Xen if we don't have CONFIG_XEN enabled?
> There isn't much point in doing so apart from avoiding an ifdef.
> This is the alternative:

Thanks.  I'd already committed it ;)

     J

> ---
>
>
> Signed-off-by: Stefano Stabellini<stefano.stabellini@...citrix.com>
>
> diff --git a/arch/x86/kernel/cpu/hypervisor.c b/arch/x86/kernel/cpu/hypervisor.c
> index bffd47c..5bccedc 100644
> --- a/arch/x86/kernel/cpu/hypervisor.c
> +++ b/arch/x86/kernel/cpu/hypervisor.c
> @@ -34,7 +34,9 @@ static const __initconst struct hypervisor_x86 * const hypervisors[] =
>   {
>   	&x86_hyper_vmware,
>   	&x86_hyper_ms_hyperv,
> +#ifdef CONFIG_XEN
>   	&x86_hyper_xen_hvm,
> +#endif
>   };
>
>   const struct hypervisor_x86 *x86_hyper;
>

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