linux-kernel - Re: [PATCH v2 2/3] xen/privcmd: Add IOCTL_PRIVCMD_DM

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Date:   Sat, 11 Feb 2017 03:25:49 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Paul Durrant <paul.durrant@...rix.com>
Cc:     kbuild-all@...org, xen-devel@...ts.xenproject.org,
        linux-kernel@...r.kernel.org,
        Paul Durrant <paul.durrant@...rix.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>
Subject: Re: [PATCH v2 2/3] xen/privcmd: Add IOCTL_PRIVCMD_DM_OP

Hi Paul,

[auto build test ERROR on xen-tip/linux-next]
[also build test ERROR on v4.10-rc7 next-20170210]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Paul-Durrant/xen-privcmd-support-for-dm_op-and-restriction/20170211-001520
base:   https://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git linux-next
config: arm64-defconfig (attached as .config)
compiler: aarch64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=arm64 

All errors (new ones prefixed by >>):

   drivers/xen/privcmd.c: In function 'privcmd_ioctl_dm_op':
>> drivers/xen/privcmd.c:673:7: error: implicit declaration of function 'HYPERVISOR_dm_op' [-Werror=implicit-function-declaration]
     rc = HYPERVISOR_dm_op(kdata.dom, kdata.num, xbufs);
          ^~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/HYPERVISOR_dm_op +673 drivers/xen/privcmd.c

   667		for (i = 0; i < kdata.num; i++) {
   668			set_xen_guest_handle(xbufs[i].h, kbufs[i].uptr);
   669			xbufs[i].size = kbufs[i].size;
   670		}
   671	
   672		xen_preemptible_hcall_begin();
 > 673		rc = HYPERVISOR_dm_op(kdata.dom, kdata.num, xbufs);
   674		xen_preemptible_hcall_end();
   675	
   676	out:

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