Revert "mm: remove callers of pfn_t functionality"

JIRA: https://issues.redhat.com/browse/RHEL-116879

Upstream Status: RHEL only

This reverts commit 21aa65b.

Signed-off-by: Anusha Srivatsa <asrivats@redhat.com>

Author: anushasrivats

drivers/gpu/drm/gma500/fbdev.c

@@ -6,6 +6,7 @@
  **************************************************************************/
 
 #include <linux/fb.h>
+#include <linux/pfn_t.h>
 
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_drv.h>
@@ -32,7 +33,7 @@ static vm_fault_t psb_fbdev_vm_fault(struct vm_fault *vmf)
 	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 
 	for (i = 0; i < page_num; ++i) {
-		err = vmf_insert_mixed(vma, address, pfn);
+		err = vmf_insert_mixed(vma, address, __pfn_to_pfn_t(pfn, 0));
 		if (unlikely(err & VM_FAULT_ERROR))
 			break;
 		address += PAGE_SIZE;

drivers/gpu/drm/i915/gem/i915_gem_mman.c

@@ -5,6 +5,7 @@
 
 #include <linux/anon_inodes.h>
 #include <linux/mman.h>
+#include <linux/pfn_t.h>
 #include <linux/sizes.h>
 
 #include <drm/drm_cache.h>

drivers/hwtracing/intel_th/msu.c

@@ -19,6 +19,7 @@
 #include <linux/io.h>
 #include <linux/workqueue.h>
 #include <linux/dma-mapping.h>
+#include <linux/pfn_t.h>
 
 #ifdef CONFIG_X86
 #include <asm/set_memory.h>