Re: [PATCH] xen/events: use virt_xxx barriers

[kbuild test robot]

Hi Michael,

[auto build test ERROR on v4.4-rc8]
[also build test ERROR on next-20151231]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Michael-S-Tsirkin/xen-events-use-virt_xxx-barriers/20160104-194916
config: x86_64-randconfig-x008-01040711 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/xen/events/events_fifo.c: In function 'consume_one_event':
>> drivers/xen/events/events_fifo.c:300:3: error: implicit declaration of function 'virt_rmb' [-Werror=implicit-function-declaration]
      virt_rmb(); /* Ensure word is up-to-date before reading head. */
      ^
   cc1: some warnings being treated as errors

vim +/virt_rmb +300 drivers/xen/events/events_fifo.c

   294	
   295		/*
   296		 * Reached the tail last time?  Read the new HEAD from the
   297		 * control block.
   298		 */
   299		if (head == 0) {
 > 300			virt_rmb(); /* Ensure word is up-to-date before reading head. */
   301			head = control_block->head[priority];
   302		}
   303	

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