On Sun, 17 Jul 2005, Jon Smirl wrote:
> On 7/17/05, Jesper Juhl <[email protected]> wrote:
> > Resource freeing functions should generally be safe to call with NULL pointers.
> > Why?
> > - there is some precedence in the kernel for this for deallocation functions.
> > - removes the need for callers to check pointers for NULL.
> > - space is saved overall by less code to test pointers for NULL all over the place.
> > - removes possible NULL pointer dereferences when a caller forgot to check.
> >
> > This patch makes fb_dealloc_cmap() safe to call with a NULL pointer argument.
>
> The fb cmap copde would be a lot simpler if it did everything with a
> single allocation instead of five. Make a super cmap struct:
>
> struct fb_super_cmap {
> struct fb_cmap cmap;
> __u16 red[255];
> __u16 blue[255];
> __u16 green[255];
> __u16 transp[255];
^^^
I assume you meant 256?
> }
>
> Then adjust the code as need. Have the embedded cmap struct point to
> the fields in the super_cmap and the drivers don't have to be changed.
What if your colormap has more than 256 entries?
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
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
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