linux-kernel - Re: arch/x86/xen/suspend.c:70:9: error: implicit declaration of function 'xen_pv

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Date:	Tue, 22 Dec 2015 09:31:13 -0500
From:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	kbuild test robot <fengguang.wu@...el.com>,
	Sasha Levin <sasha.levin@...cle.com>, kbuild-all@...org,
	linux-kernel@...r.kernel.org,
	Linux Memory Management List <linux-mm@...ck.org>,
	David Vrabel <david.vrabel@...rix.com>
Subject: Re: arch/x86/xen/suspend.c:70:9: error: implicit declaration of
 function 'xen_pv_domain'

On 12/22/2015 06:49 AM, Stefano Stabellini wrote:
> On Mon, 21 Dec 2015, Andrew Morton wrote:
>> On Mon, 21 Dec 2015 00:43:17 +0800 kbuild test robot <fengguang.wu@...el.com> wrote:
>>
>>> First bad commit (maybe != root cause):
>>>
>>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>>> head:   69c37a92ddbf79d9672230f21a04580d7ac2f4c3
>>> commit: 71458cfc782eafe4b27656e078d379a34e472adf kernel: add support for gcc 5
>>> date:   1 year, 2 months ago
>>> config: x86_64-randconfig-x006-201551 (attached as .config)
>>> reproduce:
>>>          git checkout 71458cfc782eafe4b27656e078d379a34e472adf
>>>          # save the attached .config to linux build tree
>>>          make ARCH=x86_64
>>>
>>> All errors (new ones prefixed by >>):
>>>
>>>     arch/x86/xen/suspend.c: In function 'xen_arch_pre_suspend':
>>>>> arch/x86/xen/suspend.c:70:9: error: implicit declaration of function 'xen_pv_domain' [-Werror=implicit-function-declaration]
>>>          if (xen_pv_domain())
>>>              ^
>> hm, tricky!
>>
>> --- a/arch/x86/xen/suspend.c~arch-x86-xen-suspendc-include-xen-xenh
>> +++ a/arch/x86/xen/suspend.c
>> @@ -1,6 +1,7 @@
>>   #include <linux/types.h>
>>   #include <linux/tick.h>
>>   
>> +#include <xen/xen.h>
>>   #include <xen/interface/xen.h>
>>   #include <xen/grant_table.h>
>>   #include <xen/events.h>
>
> Looks like the right fix. David? Boris?

Why are we trying to compile this if CONFIG_XEN is not set?

-boris
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