Hi Lyude,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.18-rc7 next-20180727]
[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/Lyude-Paul/drm-nouveau-Print-debug-message-on-ACPI-probe-event/20180731-150343
config: arm-multi_v7_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.2.0 make.cross ARCH=arm 

All errors (new ones prefixed by >>):

   In file included from include/linux/kernel.h:10:0,
                    from include/linux/list.h:9,
                    from include/linux/agp_backend.h:33,
                    from include/drm/drmP.h:35,
                    from drivers/gpu/drm/nouveau/nouveau_display.c:28:
   drivers/gpu/drm/nouveau/nouveau_display.c: In function 'nouveau_display_init':
>> drivers/gpu/drm/nouveau/nouveau_display.c:431:16: error: 'struct nouveau_drm' has no member named 'acpi_hpd_enabled'
     WRITE_ONCE(drm->acpi_hpd_enabled, false);
                   ^
   include/linux/compiler.h:275:17: note: in definition of macro 'WRITE_ONCE'
     union { typeof(x) __val; char __c[1]; } __u = \
                    ^
>> drivers/gpu/drm/nouveau/nouveau_display.c:431:16: error: 'struct nouveau_drm' has no member named 'acpi_hpd_enabled'
     WRITE_ONCE(drm->acpi_hpd_enabled, false);
                   ^
   include/linux/compiler.h:276:30: note: in definition of macro 'WRITE_ONCE'
      { .__val = (__force typeof(x)) (val) }; \
                                 ^
>> drivers/gpu/drm/nouveau/nouveau_display.c:431:16: error: 'struct nouveau_drm' has no member named 'acpi_hpd_enabled'
     WRITE_ONCE(drm->acpi_hpd_enabled, false);
                   ^
   include/linux/compiler.h:277:22: note: in definition of macro 'WRITE_ONCE'
     __write_once_size(&(x), __u.__c, sizeof(x)); \
                         ^
>> drivers/gpu/drm/nouveau/nouveau_display.c:431:16: error: 'struct nouveau_drm' has no member named 'acpi_hpd_enabled'
     WRITE_ONCE(drm->acpi_hpd_enabled, false);
                   ^
   include/linux/compiler.h:277:42: note: in definition of macro 'WRITE_ONCE'
     __write_once_size(&(x), __u.__c, sizeof(x)); \
                                             ^
   drivers/gpu/drm/nouveau/nouveau_display.c: In function 'nouveau_display_fini':
   drivers/gpu/drm/nouveau/nouveau_display.c:458:17: error: 'struct nouveau_drm' has no member named 'acpi_hpd_enabled'
      WRITE_ONCE(drm->acpi_hpd_enabled, true);
                    ^
   include/linux/compiler.h:275:17: note: in definition of macro 'WRITE_ONCE'
     union { typeof(x) __val; char __c[1]; } __u = \
                    ^
   drivers/gpu/drm/nouveau/nouveau_display.c:458:17: error: 'struct nouveau_drm' has no member named 'acpi_hpd_enabled'
      WRITE_ONCE(drm->acpi_hpd_enabled, true);
                    ^
   include/linux/compiler.h:276:30: note: in definition of macro 'WRITE_ONCE'
      { .__val = (__force typeof(x)) (val) }; \
                                 ^
   drivers/gpu/drm/nouveau/nouveau_display.c:458:17: error: 'struct nouveau_drm' has no member named 'acpi_hpd_enabled'
      WRITE_ONCE(drm->acpi_hpd_enabled, true);
                    ^
   include/linux/compiler.h:277:22: note: in definition of macro 'WRITE_ONCE'
     __write_once_size(&(x), __u.__c, sizeof(x)); \
                         ^
   drivers/gpu/drm/nouveau/nouveau_display.c:458:17: error: 'struct nouveau_drm' has no member named 'acpi_hpd_enabled'
      WRITE_ONCE(drm->acpi_hpd_enabled, true);
                    ^
   include/linux/compiler.h:277:42: note: in definition of macro 'WRITE_ONCE'
     __write_once_size(&(x), __u.__c, sizeof(x)); \
                                             ^

vim +431 drivers/gpu/drm/nouveau/nouveau_display.c

   404	
   405	int
   406	nouveau_display_init(struct drm_device *dev, bool runtime)
   407	{
   408		struct nouveau_display *disp = nouveau_display(dev);
   409		struct nouveau_drm *drm = nouveau_drm(dev);
   410		struct drm_connector *connector;
   411		struct drm_connector_list_iter conn_iter;
   412		int ret;
   413	
   414		ret = disp->init(dev);
   415		if (ret)
   416			return ret;
   417	
   418		/* enable hotplug interrupts */
   419		drm_connector_list_iter_begin(dev, &conn_iter);
   420		nouveau_for_each_non_mst_connector_iter(connector, &conn_iter) {
   421			struct nouveau_connector *conn = nouveau_connector(connector);
   422			nvif_notify_get(&conn->hpd);
   423		}
   424		drm_connector_list_iter_end(&conn_iter);
   425	
   426		/* disable ACPI hotplug handling to prevent duplicate connector
   427		 * probes
   428		 * FIXME: make sure that WRITE_ONCE() implies a store barrier
   429		 * beforehand
   430		 */
 > 431		WRITE_ONCE(drm->acpi_hpd_enabled, false);
   432	
   433		/* enable flip completion events */
   434		nvif_notify_get(&drm->flip);
   435		return ret;
   436	}
   437	

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