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

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Message-Id: <20151221140704.e376871cd786498eb5e71352@linux-foundation.org>
Date:	Mon, 21 Dec 2015 14:07:04 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	kbuild test robot <fengguang.wu@...el.com>
Cc:	Sasha Levin <sasha.levin@...cle.com>, kbuild-all@...org,
	linux-kernel@...r.kernel.org,
	Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: arch/x86/xen/suspend.c:70:9: error: implicit declaration of
 function 'xen_pv_domain'

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>
_

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