fbdev: kill sparse warning in deferred IO

Kill the following in fb_defio.c:

drivers/video/fb_defio.c:40:43: warning: incorrect type in argument 1 (different address spaces)
drivers/video/fb_defio.c:40:43:    expected void *addr
drivers/video/fb_defio.c:40:43:    got char [noderef] *screen_base<asn:2>

The framebuffer memory of these types of devices are allocated from system
RAM.

Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/video/fb_defio.c b/drivers/video/fb_defio.c
index f963f5f59b73..1a8643f053d8 100644
--- a/drivers/video/fb_defio.c
+++ b/drivers/video/fb_defio.c
@@ -32,12 +32,14 @@ static struct page* fb_deferred_io_nopage(struct vm_area_struct *vma,
         unsigned long offset;
         struct page *page;
         struct fb_info *info = vma->vm_private_data;
+        /* info->screen_base is in System RAM */
+        void *screen_base = (void __force *) info->screen_base;
 
         offset = (vaddr - vma->vm_start) + (vma->vm_pgoff << PAGE_SHIFT);
         if (offset >= info->fix.smem_len)
                 return NOPAGE_SIGBUS;
 
-        page = vmalloc_to_page(info->screen_base + offset);
+        page = vmalloc_to_page(screen_base + offset);
         if (!page)
                 return NOPAGE_OOM;