Hi Thomas,
On Thu, Apr 20, 2023 at 1:10 PM Thomas Zimmermann <tzimmermann@xxxxxxx> wrote:
> Am 20.04.23 um 12:04 schrieb Sui Jingfeng:
> > What will happen if the 'screen_size' is not page_size aligned and mmap
> > will mapping in the granularity of pages ?
>
> You need to map at page granularity. If screen_size is not page-size
> aligned, there's this trailing buffer that is accessible, but cannot be
> displayed. But userspace has no direct way of knowing that, so let's
> ignore that problem for now.
Userspace can know, if fb_fix_screeninfo.smem_{start,len} match
the actual offset and size.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
