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

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Date:	Mon, 21 Dec 2015 00:43:17 +0800
From:	kbuild test robot <fengguang.wu@...el.com>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	kbuild-all@...org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Memory Management List <linux-mm@...ck.org>
Subject: arch/x86/xen/suspend.c:70:9: error: implicit declaration of function
 'xen_pv_domain'

Hi Sasha,

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())
            ^
   cc1: some warnings being treated as errors

vim +/xen_pv_domain +70 arch/x86/xen/suspend.c

0e91398f Jeremy Fitzhardinge 2008-05-26  54  			pfn_to_mfn(xen_start_info->store_mfn);
0e91398f Jeremy Fitzhardinge 2008-05-26  55  		xen_start_info->console.domU.mfn =
0e91398f Jeremy Fitzhardinge 2008-05-26  56  			pfn_to_mfn(xen_start_info->console.domU.mfn);
0e91398f Jeremy Fitzhardinge 2008-05-26  57  	} else {
0e91398f Jeremy Fitzhardinge 2008-05-26  58  #ifdef CONFIG_SMP
b78936e1 Mike Travis         2008-12-16  59  		BUG_ON(xen_cpu_initialized_map == NULL);
b78936e1 Mike Travis         2008-12-16  60  		cpumask_copy(xen_cpu_initialized_map, cpu_online_mask);
0e91398f Jeremy Fitzhardinge 2008-05-26  61  #endif
9c7a7942 Jeremy Fitzhardinge 2008-05-31  62  		xen_vcpu_restore();
0e91398f Jeremy Fitzhardinge 2008-05-26  63  	}
0e91398f Jeremy Fitzhardinge 2008-05-26  64  
aa8532c3 David Vrabel        2014-05-08  65  	xen_mm_unpin_all();
aa8532c3 David Vrabel        2014-05-08  66  }
aa8532c3 David Vrabel        2014-05-08  67  
aa8532c3 David Vrabel        2014-05-08  68  void xen_arch_pre_suspend(void)
aa8532c3 David Vrabel        2014-05-08  69  {
aa8532c3 David Vrabel        2014-05-08 @70      if (xen_pv_domain())
aa8532c3 David Vrabel        2014-05-08  71          xen_pv_pre_suspend();
aa8532c3 David Vrabel        2014-05-08  72  }
aa8532c3 David Vrabel        2014-05-08  73  
aa8532c3 David Vrabel        2014-05-08  74  void xen_arch_post_suspend(int cancelled)
aa8532c3 David Vrabel        2014-05-08  75  {
aa8532c3 David Vrabel        2014-05-08  76      if (xen_pv_domain())
aa8532c3 David Vrabel        2014-05-08  77          xen_pv_post_suspend(cancelled);
aa8532c3 David Vrabel        2014-05-08  78      else

:::::: The code at line 70 was first introduced by commit
:::::: aa8532c32216ae07c3813b9aeb774517878a7573 xen: refactor suspend pre/post hooks

:::::: TO: David Vrabel <david.vrabel@...rix.com>
:::::: CC: David Vrabel <david.vrabel@...rix.com>

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