[PATCH] drm/ttm: remove unneeded preempt_disable/enable

[Akinobu Mita]

It is unnecessary to disable preemption explicitly while calling
copy_highpage().  Because copy_highpage() will do it again through
kmap_atomic/kunmap_atomic.

Signed-off-by: Akinobu Mita <akinobu.mita at gmail.com>
Cc: dri-devel at lists.freedesktop.org
Cc: David Airlie <airlied at linux.ie>
---
 drivers/gpu/drm/ttm/ttm_tt.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
index bf82601..7d759a4 100644
--- a/drivers/gpu/drm/ttm/ttm_tt.c
+++ b/drivers/gpu/drm/ttm/ttm_tt.c
@@ -308,9 +308,7 @@ int ttm_tt_swapin(struct ttm_tt *ttm)
                if (unlikely(to_page == NULL))
                        goto out_err;

-               preempt_disable();
                copy_highpage(to_page, from_page);
-               preempt_enable();
                page_cache_release(from_page);
        }

@@ -358,9 +356,7 @@ int ttm_tt_swapout(struct ttm_tt *ttm, struct file 
*persistent_swap_storage)
                        ret = PTR_ERR(to_page);
                        goto out_err;
                }
-               preempt_disable();
                copy_highpage(to_page, from_page);
-               preempt_enable();
                set_page_dirty(to_page);
                mark_page_accessed(to_page);
                page_cache_release(to_page);
-- 
1.7.11.7