vfb: make virtual framebuffer mmapable
Changed things: 1. vmalloc()/vfree() replaced with rvmalloc()/rvfree() (taken from drivers/media/video/se401.c) 2. mmap method implemented (mostly taken from drivers/media/video/se401.c) 3. smem_start and smem_len fields of struct fb_fix_screeninfo initialized. (smem_start initialized with virtual address, don't know if it is really bad...) [adaplas: sparse warning fix] Signed-off-by: NAntonino Daplas <adaplas@gmail.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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