drm: Fix broken use of _PAGE_NO_CACHE on powerpc

That constant isn't meant to be used outside of arch mm code
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1467018023.20278.65.camel@kernel.crashing.org

drivers/gpu/drm/drm_memory.c

@@ -44,7 +44,7 @@
 # include <asm/agp.h>
 #else
 # ifdef __powerpc__
-#  define PAGE_AGP	__pgprot(_PAGE_KERNEL | _PAGE_NO_CACHE)
+#  define PAGE_AGP	pgprot_noncached_wc(PAGE_KERNEL)
 # else
 #  define PAGE_AGP	PAGE_KERNEL
 # endif

drivers/gpu/drm/drm_scatter.c

@@ -41,7 +41,7 @@
 static inline void *drm_vmalloc_dma(unsigned long size)
 {
 #if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
-	return __vmalloc(size, GFP_KERNEL, PAGE_KERNEL | _PAGE_NO_CACHE);
+	return __vmalloc(size, GFP_KERNEL, pgprot_noncached_wc(PAGE_KERNEL));
 #else
 	return vmalloc_32(size);
 #endif

drivers/gpu/drm/drm_vm.c

@@ -80,7 +80,7 @@ static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma)
 	pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
 
 #if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
-	tmp |= _PAGE_NO_CACHE;
+	tmp = pgprot_noncached_wc(tmp);
 #endif
 	return tmp;
 }
@@ -593,7 +593,7 @@ static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
 			 * pages and mappings in fault()
 			 */
 #if defined(__powerpc__)
-			pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
+			vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 #endif
 			vma->vm_ops = &drm_vm_ops;
 			break;