drm: Constify gem_vm_ops pointer

The GEM vm operations structure is passed to the VM core that stores it
in a const field. There vm operations structures can thus be const in
DRM as well.
Signed-off-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Inki Dae <inki.dae@samsung.com>
Cc: Alan Cox <alan@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Rob Clark <rob.clark@linaro.org>
Reviewed-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

drivers/gpu/drm/exynos/exynos_drm_drv.c

@@ -193,7 +193,7 @@ static void exynos_drm_lastclose(struct drm_device *dev)
 	exynos_drm_fbdev_restore_mode(dev);
 }
 
-static struct vm_operations_struct exynos_drm_gem_vm_ops = {
+static const struct vm_operations_struct exynos_drm_gem_vm_ops = {
 	.fault = exynos_drm_gem_fault,
 	.open = drm_gem_vm_open,
 	.close = drm_gem_vm_close,

drivers/gpu/drm/gma500/framebuffer.c

@@ -153,7 +153,7 @@ static void psbfb_vm_close(struct vm_area_struct *vma)
 {
 }
 
-static struct vm_operations_struct psbfb_vm_ops = {
+static const struct vm_operations_struct psbfb_vm_ops = {
 	.fault	= psbfb_vm_fault,
 	.open	= psbfb_vm_open,
 	.close	= psbfb_vm_close

drivers/gpu/drm/gma500/psb_drv.c

@@ -595,7 +595,7 @@ static const struct dev_pm_ops psb_pm_ops = {
 	.runtime_idle = psb_runtime_idle,
 };
 
-static struct vm_operations_struct psb_gem_vm_ops = {
+static const struct vm_operations_struct psb_gem_vm_ops = {
 	.fault = psb_gem_fault,
 	.open = drm_gem_vm_open,
 	.close = drm_gem_vm_close,

drivers/gpu/drm/i915/i915_drv.c

@@ -1012,7 +1012,7 @@ static const struct dev_pm_ops i915_pm_ops = {
 	.restore = i915_pm_resume,
 };
 
-static struct vm_operations_struct i915_gem_vm_ops = {
+static const struct vm_operations_struct i915_gem_vm_ops = {
 	.fault = i915_gem_fault,
 	.open = drm_gem_vm_open,
 	.close = drm_gem_vm_close,

drivers/gpu/drm/udl/udl_drv.c

@@ -38,7 +38,7 @@ static void udl_usb_disconnect(struct usb_interface *interface)
 	drm_unplug_dev(dev);
 }
 
-static struct vm_operations_struct udl_gem_vm_ops = {
+static const struct vm_operations_struct udl_gem_vm_ops = {
 	.fault = udl_gem_fault,
 	.open = drm_gem_vm_open,
 	.close = drm_gem_vm_close,

drivers/staging/omapdrm/omap_drv.c

@@ -726,7 +726,7 @@ static void dev_irq_uninstall(struct drm_device *dev)
 	DBG("irq_uninstall: dev=%p", dev);
 }
 
-static struct vm_operations_struct omap_gem_vm_ops = {
+static const struct vm_operations_struct omap_gem_vm_ops = {
 	.fault = omap_gem_fault,
 	.open = drm_gem_vm_open,
 	.close = drm_gem_vm_close,

include/drm/drmP.h

@@ -941,7 +941,7 @@ struct drm_driver {
 			    uint32_t handle);
 
 	/* Driver private ops for this object */
-	struct vm_operations_struct *gem_vm_ops;
+	const struct vm_operations_struct *gem_vm_ops;
 
 	int major;
 	int minor;