drm/exynos: use __free_page() to deallocate memory

this patch uses __free_page() to deallocate the pages allocated
by alloc_page() and the pages doesn't need set_parge_dirty()
and mark_page_accessed() because they aren't from page cache so
removes them.

this patch has a pair with previous patch below,
	http://www.spinics.net/lists/dri-devel/msg24382.html

Changelog v2:
remove unnecessary arguments.

Changelog v3:
fix npages type.
- npages can have negative value.

Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

1 files changed, 6 insertions, 15 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c
index a9bf526c1704..2da6cdb1fa37 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
@@ -126,23 +126,14 @@ fail:
 }
 
 static void exynos_gem_put_pages(struct drm_gem_object *obj,
-                                        struct page **pages,
-                                        bool dirty, bool accessed)
+                                        struct page **pages)
 {
-        int i, npages;
+        int npages;
 
         npages = obj->size >> PAGE_SHIFT;
 
-        for (i = 0; i < npages; i++) {
-                if (dirty)
-                        set_page_dirty(pages[i]);
-
-                if (accessed)
-                        mark_page_accessed(pages[i]);
-
-                /* Undo the reference we took when populating the table */
-                page_cache_release(pages[i]);
-        }
+        while (--npages >= 0)
+                __free_page(pages[npages]);
 
         drm_free_large(pages);
 }
@@ -222,7 +213,7 @@ err1:
         kfree(buf->sgt);
         buf->sgt = NULL;
 err:
-        exynos_gem_put_pages(obj, pages, true, false);
+        exynos_gem_put_pages(obj, pages);
         return ret;
 
 }
@@ -240,7 +231,7 @@ static void exynos_drm_gem_put_pages(struct drm_gem_object *obj)
         kfree(buf->sgt);
         buf->sgt = NULL;
 
-        exynos_gem_put_pages(obj, buf->pages, true, false);
+        exynos_gem_put_pages(obj, buf->pages);
         buf->pages = NULL;
 
         /* add some codes for UNCACHED type here. TODO */