Move the sysrq functionality from DRM fb-helpers to the DRM device
and in-kernel clients, so that all it becomes available on all clients.

DRM fbdev helpers support emergency restoration of the console output
via a special key combination. Press SysRq+v to replace the current
compositor with the kernel's output on the text-mode console. This
allows users to see the log messages during system emergencies.

By moving the functionality from fb-helper to DRM devices, any
in-kernel client can serve as emergency output. This can be used to
bring up drm_log, for example.

Each DRM device registers itself to the list possible sysrq handlers.
On receiving SysRq+v, the DRM core goes over all registered devices and
restores an in-kernel DRM client for each of them.

See Documentation/admin-guide/sysrq.rst on how to invoke SysRq. Switch
VTs to bring back the user-space compositor.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/Makefile           |  3 +-
 drivers/gpu/drm/drm_client.c       |  1 +
 drivers/gpu/drm/drm_client_sysrq.c | 65 ++++++++++++++++++++++++++++++
 drivers/gpu/drm/drm_drv.c          |  3 ++
 drivers/gpu/drm/drm_fb_helper.c    | 45 +--------------------
 drivers/gpu/drm/drm_internal.h     | 11 +++++
 include/drm/drm_device.h           |  8 ++++
 7 files changed, 91 insertions(+), 45 deletions(-)
 create mode 100644 drivers/gpu/drm/drm_client_sysrq.c

diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index c2672f369aed..9901534948e5 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -76,7 +76,8 @@ drm-y := \
 drm-$(CONFIG_DRM_CLIENT) += \
 	drm_client.o \
 	drm_client_event.o \
-	drm_client_modeset.o
+	drm_client_modeset.o \
+	drm_client_sysrq.o
 drm-$(CONFIG_DRM_LIB_RANDOM) += lib/drm_random.o
 drm-$(CONFIG_COMPAT) += drm_ioc32.o
 drm-$(CONFIG_DRM_PANEL) += drm_panel.o
diff --git a/drivers/gpu/drm/drm_client.c b/drivers/gpu/drm/drm_client.c
index 504ec5bdfa2c..a82d741e6630 100644
--- a/drivers/gpu/drm/drm_client.c
+++ b/drivers/gpu/drm/drm_client.c
@@ -11,6 +11,7 @@
 #include <linux/slab.h>
 
 #include <drm/drm_client.h>
+#include <drm/drm_client_event.h>
 #include <drm/drm_device.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_file.h>
diff --git a/drivers/gpu/drm/drm_client_sysrq.c b/drivers/gpu/drm/drm_client_sysrq.c
new file mode 100644
index 000000000000..eea660096f1b
--- /dev/null
+++ b/drivers/gpu/drm/drm_client_sysrq.c
@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: GPL-2.0 or MIT
+
+#include <linux/sysrq.h>
+
+#include <drm/drm_client_event.h>
+#include <drm/drm_device.h>
+#include <drm/drm_print.h>
+
+#include "drm_internal.h"
+
+#ifdef CONFIG_MAGIC_SYSRQ
+static LIST_HEAD(drm_client_sysrq_dev_list);
+static DEFINE_MUTEX(drm_client_sysrq_dev_lock);
+
+/* emergency restore, don't bother with error reporting */
+static void drm_client_sysrq_restore_work_fn(struct work_struct *ignored)
+{
+	struct drm_device *dev;
+
+	guard(mutex)(&drm_client_sysrq_dev_lock);
+
+	list_for_each_entry(dev, &drm_client_sysrq_dev_list, client_sysrq_list) {
+		if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
+			continue;
+
+		drm_client_dev_restore(dev, true);
+	}
+}
+
+static DECLARE_WORK(drm_client_sysrq_restore_work, drm_client_sysrq_restore_work_fn);
+
+static void drm_client_sysrq_restore_handler(u8 ignored)
+{
+	schedule_work(&drm_client_sysrq_restore_work);
+}
+
+static const struct sysrq_key_op drm_client_sysrq_restore_op = {
+	.handler = drm_client_sysrq_restore_handler,
+	.help_msg = "force-fb(v)",
+	.action_msg = "Restore framebuffer console",
+};
+
+void drm_client_sysrq_register(struct drm_device *dev)
+{
+	guard(mutex)(&drm_client_sysrq_dev_lock);
+
+	if (list_empty(&drm_client_sysrq_dev_list))
+		register_sysrq_key('v', &drm_client_sysrq_restore_op);
+
+	list_add(&dev->client_sysrq_list, &drm_client_sysrq_dev_list);
+}
+
+void drm_client_sysrq_unregister(struct drm_device *dev)
+{
+	guard(mutex)(&drm_client_sysrq_dev_lock);
+
+	/* remove device from global restore list */
+	if (!drm_WARN_ON(dev, list_empty(&dev->client_sysrq_list)))
+		list_del(&dev->client_sysrq_list);
+
+	/* no devices left; unregister key */
+	if (list_empty(&drm_client_sysrq_dev_list))
+		unregister_sysrq_key('v', &drm_client_sysrq_restore_op);
+}
+#endif
diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 8e3cb08241c8..2915118436ce 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -733,6 +733,7 @@ static int drm_dev_init(struct drm_device *dev,
 	INIT_LIST_HEAD(&dev->filelist);
 	INIT_LIST_HEAD(&dev->filelist_internal);
 	INIT_LIST_HEAD(&dev->clientlist);
+	INIT_LIST_HEAD(&dev->client_sysrq_list);
 	INIT_LIST_HEAD(&dev->vblank_event_list);
 
 	spin_lock_init(&dev->event_lock);
@@ -1100,6 +1101,7 @@ int drm_dev_register(struct drm_device *dev, unsigned long flags)
 			goto err_unload;
 	}
 	drm_panic_register(dev);
+	drm_client_sysrq_register(dev);
 
 	DRM_INFO("Initialized %s %d.%d.%d for %s on minor %d\n",
 		 driver->name, driver->major, driver->minor,
@@ -1144,6 +1146,7 @@ void drm_dev_unregister(struct drm_device *dev)
 {
 	dev->registered = false;
 
+	drm_client_sysrq_unregister(dev);
 	drm_panic_unregister(dev);
 
 	drm_client_dev_unregister(dev);
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 1392738ce2fe..9a734017756b 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -32,7 +32,6 @@
 #include <linux/console.h>
 #include <linux/export.h>
 #include <linux/pci.h>
-#include <linux/sysrq.h>
 #include <linux/vga_switcheroo.h>
 
 #include <drm/drm_atomic.h>
@@ -270,42 +269,6 @@ int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper, b
 }
 EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked);
 
-#ifdef CONFIG_MAGIC_SYSRQ
-/* emergency restore, don't bother with error reporting */
-static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
-{
-	struct drm_fb_helper *helper;
-
-	mutex_lock(&kernel_fb_helper_lock);
-	list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
-		struct drm_device *dev = helper->dev;
-
-		if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
-			continue;
-
-		mutex_lock(&helper->lock);
-		drm_client_modeset_commit_locked(&helper->client);
-		mutex_unlock(&helper->lock);
-	}
-	mutex_unlock(&kernel_fb_helper_lock);
-}
-
-static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
-
-static void drm_fb_helper_sysrq(u8 dummy1)
-{
-	schedule_work(&drm_fb_helper_restore_work);
-}
-
-static const struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
-	.handler = drm_fb_helper_sysrq,
-	.help_msg = "force-fb(v)",
-	.action_msg = "Restore framebuffer console",
-};
-#else
-static const struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
-#endif
-
 static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
 {
 	struct drm_fb_helper *fb_helper = info->par;
@@ -602,11 +565,8 @@ void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
 	drm_fb_helper_release_info(fb_helper);
 
 	mutex_lock(&kernel_fb_helper_lock);
-	if (!list_empty(&fb_helper->kernel_fb_list)) {
+	if (!list_empty(&fb_helper->kernel_fb_list))
 		list_del(&fb_helper->kernel_fb_list);
-		if (list_empty(&kernel_fb_helper_list))
-			unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
-	}
 	mutex_unlock(&kernel_fb_helper_lock);
 
 	if (!fb_helper->client.funcs)
@@ -1840,9 +1800,6 @@ __drm_fb_helper_initial_config_and_unlock(struct drm_fb_helper *fb_helper)
 		 info->node, info->fix.id);
 
 	mutex_lock(&kernel_fb_helper_lock);
-	if (list_empty(&kernel_fb_helper_list))
-		register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
-
 	list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
 	mutex_unlock(&kernel_fb_helper_lock);
 
diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h
index 5a3bed48ab1f..59cbac12a6d6 100644
--- a/drivers/gpu/drm/drm_internal.h
+++ b/drivers/gpu/drm/drm_internal.h
@@ -56,6 +56,17 @@ static inline void drm_client_debugfs_init(struct drm_device *dev)
 { }
 #endif
 
+/* drm_client_sysrq.c */
+#if defined(CONFIG_DRM_CLIENT) && defined(CONFIG_MAGIC_SYSRQ)
+void drm_client_sysrq_register(struct drm_device *dev);
+void drm_client_sysrq_unregister(struct drm_device *dev);
+#else
+void drm_client_sysrq_register(struct drm_device *dev)
+{ }
+void drm_client_sysrq_unregister(struct drm_device *dev)
+{ }
+#endif
+
 /* drm_file.c */
 extern struct mutex drm_global_mutex;
 bool drm_dev_needs_global_mutex(struct drm_device *dev);
diff --git a/include/drm/drm_device.h b/include/drm/drm_device.h
index 778b2cca6c49..5af49c5c3778 100644
--- a/include/drm/drm_device.h
+++ b/include/drm/drm_device.h
@@ -238,6 +238,14 @@ struct drm_device {
 	 */
 	struct list_head clientlist;
 
+	/**
+	 * @client_sysrq_list:
+	 *
+	 * Entry into list of devices registered for sysrq. Allows in-kernel
+	 * clients on this device to handle sysrq keys.
+	 */
+	struct list_head client_sysrq_list;
+
 	/**
 	 * @vblank_disable_immediate:
 	 *
-- 
2.51.1

Hi Thomas,

kernel test robot noticed the following build errors:

[auto build test ERROR on next-20251107]
[cannot apply to drm/drm-next drm-exynos/exynos-drm-next drm-intel/for-linux-next drm-intel/for-linux-next-fixes drm-misc/drm-misc-next drm-tip/drm-tip linus/master v6.18-rc4 v6.18-rc3 v6.18-rc2 v6.18-rc5]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Thomas-Zimmermann/drm-client-Pass-force-parameter-to-client-restore/20251107-223026
base:   next-20251107
patch link:    https://lore.kernel.org/r/20251107142612.467817-3-tzimmermann%40suse.de
patch subject: [PATCH 2/3] drm/client: Support emergency restore via sysrq for all clients
config: powerpc64-randconfig-001-20251110 (https://download.01.org/0day-ci/archive/20251110/202511102156.RRA8JQGz-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 0d786b9a207aa0e6d88dde7fd9ffe0b364db69a4)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251110/202511102156.RRA8JQGz-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202511102156.RRA8JQGz-lkp@intel.com/

All errors (new ones prefixed by >>):

>> ld.lld: error: duplicate symbol: drm_client_sysrq_register
   >>> defined at drm_internal.h:65 (drivers/gpu/drm/drm_internal.h:65)
   >>>            drivers/gpu/drm/drm_atomic.o:(drm_client_sysrq_register) in archive vmlinux.a
   >>> defined at drm_internal.h:65 (drivers/gpu/drm/drm_internal.h:65)
   >>>            drivers/gpu/drm/drm_auth.o:(.text+0x0) in archive vmlinux.a
--
>> ld.lld: error: duplicate symbol: drm_client_sysrq_unregister
   >>> defined at drm_internal.h:67 (drivers/gpu/drm/drm_internal.h:67)
   >>>            drivers/gpu/drm/drm_atomic.o:(drm_client_sysrq_unregister) in archive vmlinux.a
   >>> defined at drm_internal.h:67 (drivers/gpu/drm/drm_internal.h:67)
   >>>            drivers/gpu/drm/drm_auth.o:(.text+0x40) in archive vmlinux.a
--
>> ld.lld: error: duplicate symbol: drm_client_sysrq_register
   >>> defined at drm_internal.h:65 (drivers/gpu/drm/drm_internal.h:65)
   >>>            drivers/gpu/drm/drm_atomic.o:(drm_client_sysrq_register) in archive vmlinux.a
   >>> defined at drm_internal.h:65 (drivers/gpu/drm/drm_internal.h:65)
   >>>            drivers/gpu/drm/drm_edid.o:(.text+0x0) in archive vmlinux.a
--
>> ld.lld: error: duplicate symbol: drm_client_sysrq_unregister
   >>> defined at drm_internal.h:67 (drivers/gpu/drm/drm_internal.h:67)
   >>>            drivers/gpu/drm/drm_atomic.o:(drm_client_sysrq_unregister) in archive vmlinux.a
   >>> defined at drm_internal.h:67 (drivers/gpu/drm/drm_internal.h:67)
   >>>            drivers/gpu/drm/drm_edid.o:(.text+0x40) in archive vmlinux.a
--
>> ld.lld: error: duplicate symbol: drm_client_sysrq_register
   >>> defined at drm_internal.h:65 (drivers/gpu/drm/drm_internal.h:65)
   >>>            drivers/gpu/drm/drm_atomic.o:(drm_client_sysrq_register) in archive vmlinux.a
   >>> defined at drm_internal.h:65 (drivers/gpu/drm/drm_internal.h:65)
   >>>            drivers/gpu/drm/drm_encoder.o:(.text+0x0) in archive vmlinux.a
--
>> ld.lld: error: duplicate symbol: drm_client_sysrq_unregister
   >>> defined at drm_internal.h:67 (drivers/gpu/drm/drm_internal.h:67)
   >>>            drivers/gpu/drm/drm_atomic.o:(drm_client_sysrq_unregister) in archive vmlinux.a
   >>> defined at drm_internal.h:67 (drivers/gpu/drm/drm_internal.h:67)
   >>>            drivers/gpu/drm/drm_encoder.o:(.text+0x40) in archive vmlinux.a
--
>> ld.lld: error: duplicate symbol: drm_client_sysrq_register
   >>> defined at drm_internal.h:65 (drivers/gpu/drm/drm_internal.h:65)
   >>>            drivers/gpu/drm/drm_atomic.o:(drm_client_sysrq_register) in archive vmlinux.a
   >>> defined at drm_internal.h:65 (drivers/gpu/drm/drm_internal.h:65)
   >>>            drivers/gpu/drm/drm_file.o:(.text+0x0) in archive vmlinux.a
--
>> ld.lld: error: duplicate symbol: drm_client_sysrq_unregister
   >>> defined at drm_internal.h:67 (drivers/gpu/drm/drm_internal.h:67)
   >>>            drivers/gpu/drm/drm_atomic.o:(drm_client_sysrq_unregister) in archive vmlinux.a
   >>> defined at drm_internal.h:67 (drivers/gpu/drm/drm_internal.h:67)
   >>>            drivers/gpu/drm/drm_file.o:(.text+0x40) in archive vmlinux.a
--
>> ld.lld: error: duplicate symbol: drm_client_sysrq_register
   >>> defined at drm_internal.h:65 (drivers/gpu/drm/drm_internal.h:65)
   >>>            drivers/gpu/drm/drm_atomic.o:(drm_client_sysrq_register) in archive vmlinux.a
   >>> defined at drm_internal.h:65 (drivers/gpu/drm/drm_internal.h:65)
   >>>            drivers/gpu/drm/drm_framebuffer.o:(.text+0x0) in archive vmlinux.a
--
>> ld.lld: error: duplicate symbol: drm_client_sysrq_unregister
   >>> defined at drm_internal.h:67 (drivers/gpu/drm/drm_internal.h:67)
   >>>            drivers/gpu/drm/drm_atomic.o:(drm_client_sysrq_unregister) in archive vmlinux.a
   >>> defined at drm_internal.h:67 (drivers/gpu/drm/drm_internal.h:67)
   >>>            drivers/gpu/drm/drm_framebuffer.o:(.text+0x40) in archive vmlinux.a
--
>> ld.lld: error: duplicate symbol: drm_client_sysrq_register
   >>> defined at drm_internal.h:65 (drivers/gpu/drm/drm_internal.h:65)
   >>>            drivers/gpu/drm/drm_atomic.o:(drm_client_sysrq_register) in archive vmlinux.a
   >>> defined at drm_internal.h:65 (drivers/gpu/drm/drm_internal.h:65)
   >>>            drivers/gpu/drm/drm_gem.o:(.text+0x0) in archive vmlinux.a
..

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Hi Thomas,

kernel test robot noticed the following build warnings:

[auto build test WARNING on next-20251107]
[cannot apply to drm/drm-next drm-exynos/exynos-drm-next drm-intel/for-linux-next drm-intel/for-linux-next-fixes drm-misc/drm-misc-next drm-tip/drm-tip linus/master v6.18-rc4 v6.18-rc3 v6.18-rc2 v6.18-rc5]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Thomas-Zimmermann/drm-client-Pass-force-parameter-to-client-restore/20251107-223026
base:   next-20251107
patch link:    https://lore.kernel.org/r/20251107142612.467817-3-tzimmermann%40suse.de
patch subject: [PATCH 2/3] drm/client: Support emergency restore via sysrq for all clients
config: powerpc64-randconfig-001-20251110 (https://download.01.org/0day-ci/archive/20251110/202511101950.bIUDG3LX-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 0d786b9a207aa0e6d88dde7fd9ffe0b364db69a4)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251110/202511101950.bIUDG3LX-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202511101950.bIUDG3LX-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/gpu/drm/drm_debugfs_crc.c:41:
>> drivers/gpu/drm/drm_internal.h:64:6: warning: no previous prototype for function 'drm_client_sysrq_register' [-Wmissing-prototypes]
      64 | void drm_client_sysrq_register(struct drm_device *dev)
         |      ^
   drivers/gpu/drm/drm_internal.h:64:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
      64 | void drm_client_sysrq_register(struct drm_device *dev)
         | ^
         | static 
>> drivers/gpu/drm/drm_internal.h:66:6: warning: no previous prototype for function 'drm_client_sysrq_unregister' [-Wmissing-prototypes]
      66 | void drm_client_sysrq_unregister(struct drm_device *dev)
         |      ^
   drivers/gpu/drm/drm_internal.h:66:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
      66 | void drm_client_sysrq_unregister(struct drm_device *dev)
         | ^
         | static 
   2 warnings generated.


vim +/drm_client_sysrq_register +64 drivers/gpu/drm/drm_internal.h

    58	
    59	/* drm_client_sysrq.c */
    60	#if defined(CONFIG_DRM_CLIENT) && defined(CONFIG_MAGIC_SYSRQ)
    61	void drm_client_sysrq_register(struct drm_device *dev);
    62	void drm_client_sysrq_unregister(struct drm_device *dev);
    63	#else
  > 64	void drm_client_sysrq_register(struct drm_device *dev)
    65	{ }
  > 66	void drm_client_sysrq_unregister(struct drm_device *dev)
    67	{ }
    68	#endif
    69	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Hi Thomas,

kernel test robot noticed the following build errors:

[auto build test ERROR on next-20251107]
[cannot apply to drm/drm-next drm-exynos/exynos-drm-next drm-intel/for-linux-next drm-intel/for-linux-next-fixes drm-misc/drm-misc-next drm-tip/drm-tip linus/master v6.18-rc4 v6.18-rc3 v6.18-rc2 v6.18-rc5]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Thomas-Zimmermann/drm-client-Pass-force-parameter-to-client-restore/20251107-223026
base:   next-20251107
patch link:    https://lore.kernel.org/r/20251107142612.467817-3-tzimmermann%40suse.de
patch subject: [PATCH 2/3] drm/client: Support emergency restore via sysrq for all clients
config: parisc-randconfig-002-20251110 (https://download.01.org/0day-ci/archive/20251110/202511101914.Rt1WtmfO-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 14.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251110/202511101914.Rt1WtmfO-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202511101914.Rt1WtmfO-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

   In file included from drivers/gpu/drm/drm_dumb_buffers.c:35:
>> drivers/gpu/drm/drm_internal.h:64:6: warning: no previous prototype for 'drm_client_sysrq_register' [-Wmissing-prototypes]
      64 | void drm_client_sysrq_register(struct drm_device *dev)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/gpu/drm/drm_internal.h:66:6: warning: no previous prototype for 'drm_client_sysrq_unregister' [-Wmissing-prototypes]
      66 | void drm_client_sysrq_unregister(struct drm_device *dev)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~
--
   In file included from drivers/gpu/drm/clients/drm_log.c:22:
>> drivers/gpu/drm/clients/../drm_internal.h:64:6: warning: no previous prototype for 'drm_client_sysrq_register' [-Wmissing-prototypes]
      64 | void drm_client_sysrq_register(struct drm_device *dev)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/gpu/drm/clients/../drm_internal.h:66:6: warning: no previous prototype for 'drm_client_sysrq_unregister' [-Wmissing-prototypes]
      66 | void drm_client_sysrq_unregister(struct drm_device *dev)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~
--
   hppa-linux-ld: drivers/gpu/drm/drm_auth.o: in function `drm_client_sysrq_register':
>> (.text+0x45c): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_auth.o: in function `drm_client_sysrq_unregister':
>> (.text+0x460): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_connector.o: in function `drm_client_sysrq_register':
   (.text+0x1e90): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_connector.o: in function `drm_client_sysrq_unregister':
   (.text+0x1e94): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_crtc.o: in function `drm_client_sysrq_register':
   (.text+0xab8): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_crtc.o: in function `drm_client_sysrq_unregister':
   (.text+0xabc): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_drv.o: in function `drm_client_sysrq_register':
   (.text+0x14f4): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_drv.o: in function `drm_client_sysrq_unregister':
   (.text+0x14f8): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_dumb_buffers.o: in function `drm_client_sysrq_register':
   (.text+0x20c): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_dumb_buffers.o: in function `drm_client_sysrq_unregister':
   (.text+0x210): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_edid.o: in function `drm_client_sysrq_register':
   (.text+0x734c): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_edid.o: in function `drm_client_sysrq_unregister':
   (.text+0x7350): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_encoder.o: in function `drm_client_sysrq_register':
   (.text+0x444): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_encoder.o: in function `drm_client_sysrq_unregister':
   (.text+0x448): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_file.o: in function `drm_client_sysrq_register':
   (.text+0xf10): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_file.o: in function `drm_client_sysrq_unregister':
   (.text+0xf14): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_framebuffer.o: in function `drm_client_sysrq_register':
   (.text+0x1028): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_framebuffer.o: in function `drm_client_sysrq_unregister':
   (.text+0x102c): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_gem.o: in function `drm_client_sysrq_register':
   (.text+0x1738): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_gem.o: in function `drm_client_sysrq_unregister':
   (.text+0x173c): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_ioctl.o: in function `drm_client_sysrq_register':
   (.text+0xe10): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_ioctl.o: in function `drm_client_sysrq_unregister':
   (.text+0xe14): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_lease.o: in function `drm_client_sysrq_register':
   (.text+0x7a0): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_lease.o: in function `drm_client_sysrq_unregister':
   (.text+0x7a4): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_managed.o: in function `drm_client_sysrq_register':
   (.text+0x6b8): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_managed.o: in function `drm_client_sysrq_unregister':
   (.text+0x6bc): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_mode_config.o: in function `drm_client_sysrq_register':
   (.text+0xc34): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_mode_config.o: in function `drm_client_sysrq_unregister':
   (.text+0xc38): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_prime.o: in function `drm_client_sysrq_register':
   (.text+0xb74): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_prime.o: in function `drm_client_sysrq_unregister':
   (.text+0xb78): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_syncobj.o: in function `drm_client_sysrq_register':
   (.text+0x174c): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_syncobj.o: in function `drm_client_sysrq_unregister':
   (.text+0x1750): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_sysfs.o: in function `drm_client_sysrq_register':
   (.text+0x758): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_sysfs.o: in function `drm_client_sysrq_unregister':
   (.text+0x75c): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_vblank.o: in function `drm_client_sysrq_register':
   (.text+0x2458): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_vblank.o: in function `drm_client_sysrq_unregister':
   (.text+0x245c): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_vblank_work.o: in function `drm_client_sysrq_register':
   (.text+0x594): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_vblank_work.o: in function `drm_client_sysrq_unregister':
   (.text+0x598): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_client.o: in function `drm_client_sysrq_register':
   (.text+0x830): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_client.o: in function `drm_client_sysrq_unregister':
   (.text+0x834): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_client_event.o: in function `drm_client_sysrq_register':
   (.text+0x544): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_client_event.o: in function `drm_client_sysrq_unregister':
   (.text+0x548): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_client_modeset.o: in function `drm_client_sysrq_register':
   (.text+0x2d90): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_client_modeset.o: in function `drm_client_sysrq_unregister':
   (.text+0x2d94): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_client_sysrq.o: in function `drm_client_sysrq_register':
   (.text+0x0): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_client_sysrq.o: in function `drm_client_sysrq_unregister':
   (.text+0x4): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_debugfs.o: in function `drm_client_sysrq_register':
   (.text+0x1048): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_debugfs.o: in function `drm_client_sysrq_unregister':
   (.text+0x104c): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_debugfs_crc.o: in function `drm_client_sysrq_register':
   (.text+0x9c0): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_debugfs_crc.o: in function `drm_client_sysrq_unregister':
   (.text+0x9c4): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_gem_atomic_helper.o: in function `drm_client_sysrq_register':
   (.text+0x5c8): multiple definition of `drm_client_sysrq_register'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e18): first defined here
   hppa-linux-ld: drivers/gpu/drm/drm_gem_atomic_helper.o: in function `drm_client_sysrq_unregister':
   (.text+0x5cc): multiple definition of `drm_client_sysrq_unregister'; drivers/gpu/drm/drm_atomic.o:(.text+0x2e1c): first defined here

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for OF_GPIO
   Depends on [n]: GPIOLIB [=y] && OF [=n] && HAS_IOMEM [=y]
   Selected by [y]:
   - GPIO_TB10X [=y] && GPIOLIB [=y] && HAS_IOMEM [=y] && (ARC_PLAT_TB10X || COMPILE_TEST [=y])
   WARNING: unmet direct dependencies detected for MFD_STMFX
   Depends on [n]: HAS_IOMEM [=y] && I2C [=y] && OF [=n]
   Selected by [y]:
   - PINCTRL_STMFX [=y] && PINCTRL [=y] && I2C [=y] && OF_GPIO [=y] && HAS_IOMEM [=y]
   WARNING: unmet direct dependencies detected for I2C_K1
   Depends on [n]: I2C [=y] && HAS_IOMEM [=y] && (ARCH_SPACEMIT || COMPILE_TEST [=y]) && OF [=n]
   Selected by [y]:
   - MFD_SPACEMIT_P1 [=y] && HAS_IOMEM [=y] && (ARCH_SPACEMIT || COMPILE_TEST [=y]) && I2C [=y]

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki