drm/gem-shmem: Export VM ops functions

There doesn't seem to be a way for the Rust bindings to get a
compile-time constant reference to drm_gem_shmem_vm_ops, so we need to
duplicate that structure in Rust... this isn't nice...

Signed-off-by: Asahi Lina <lina@asahilina.net>

Author: hoshinolina

drivers/gpu/drm/drm_gem_shmem_helper.c

@@ -538,7 +538,7 @@ int drm_gem_shmem_dumb_create(struct drm_file *file, struct drm_device *dev,
 }
 EXPORT_SYMBOL_GPL(drm_gem_shmem_dumb_create);
 
-static vm_fault_t drm_gem_shmem_fault(struct vm_fault *vmf)
+vm_fault_t drm_gem_shmem_fault(struct vm_fault *vmf)
 {
 	struct vm_area_struct *vma = vmf->vma;
 	struct drm_gem_object *obj = vma->vm_private_data;
@@ -567,8 +567,9 @@ static vm_fault_t drm_gem_shmem_fault(struct vm_fault *vmf)
 
 	return ret;
 }
+EXPORT_SYMBOL_GPL(drm_gem_shmem_fault);
 
-static void drm_gem_shmem_vm_open(struct vm_area_struct *vma)
+void drm_gem_shmem_vm_open(struct vm_area_struct *vma)
 {
 	struct drm_gem_object *obj = vma->vm_private_data;
 	struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
@@ -589,15 +590,17 @@ static void drm_gem_shmem_vm_open(struct vm_area_struct *vma)
 
 	drm_gem_vm_open(vma);
 }
+EXPORT_SYMBOL_GPL(drm_gem_shmem_vm_open);
 
-static void drm_gem_shmem_vm_close(struct vm_area_struct *vma)
+void drm_gem_shmem_vm_close(struct vm_area_struct *vma)
 {
 	struct drm_gem_object *obj = vma->vm_private_data;
 	struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
 
 	drm_gem_shmem_put_pages(shmem);
 	drm_gem_vm_close(vma);
 }
+EXPORT_SYMBOL_GPL(drm_gem_shmem_vm_close);
 
 const struct vm_operations_struct drm_gem_shmem_vm_ops = {
 	.fault = drm_gem_shmem_fault,

include/drm/drm_gem_shmem_helper.h

@@ -138,6 +138,9 @@ void drm_gem_shmem_print_info(const struct drm_gem_shmem_object *shmem,
 			      struct drm_printer *p, unsigned int indent);
 
 extern const struct vm_operations_struct drm_gem_shmem_vm_ops;
+vm_fault_t drm_gem_shmem_fault(struct vm_fault *vmf);
+void drm_gem_shmem_vm_open(struct vm_area_struct *vma);
+void drm_gem_shmem_vm_close(struct vm_area_struct *vma);
 
 /*
  * GEM object functions