[RFC v3 1/3] fbmem: add default get_fb_unmapped_area function

[Benjamin Gaignard]

If HAVE_ARCH_FB_UNMAPPED_AREA is set and get_fb_unmapped_area
function not defined in platform architecture let use a default function.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard at linaro.org>
---
 drivers/video/fbdev/core/fbmem.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index 76c1ad9..54488ee 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -1492,6 +1492,21 @@ static long fb_compat_ioctl(struct file *file, unsigned 
int cmd,
        return 0;
 }

+#if defined(HAVE_ARCH_FB_UNMAPPED_AREA) && !defined(get_fb_unmapped_area)
+unsigned long get_fb_unmapped_area(struct file *filp,
+                                  unsigned long addr, unsigned long len,
+                                  unsigned long pgoff, unsigned long flags)
+{
+       struct fb_info * const info = filp->private_data;
+       unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len);
+
+       if (pgoff > fb_size || len > fb_size - pgoff)
+               return -EINVAL;
+
+       return (unsigned long)info->screen_base + pgoff;
+}
+#endif
+
 static const struct file_operations fb_fops = {
        .owner =        THIS_MODULE,
        .read =         fb_read,
-- 
1.9.1