drm/ttm: remove unneeded preempt_disable/enable

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@gmail.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
index bf8260133ea9dc2cd6058118864cd481fbe8dcff..7d759a4302943bb6c5904356dd9e81dec6d4588f 100644 (file)
--- 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);