Hi Bartosz,
On Wed, Mar 13, 2019 at 10:50 AM Bartosz Golaszewski <b...@bgdev.pl> wrote:
> śr., 13 mar 2019 o 10:45 Anton Ivanov
> <anton.iva...@cambridgegreys.com> napisał(a):
> > PID can be more than 5 digits nowdays.
>
> Do we have a macro in the kernel that yields the minimum size of an
> array to fit a number? I can't find it. I vagely remember seeing
> something like this in systemd tree. If it doesn't exist in the kernel
> then maybe we should copy it over.
1 + const_ilog2(n) / log2(10) = 1 + const_ilog2(n) / 3.321928
Using fixed point calculations, that can be approximated as
1 + 19728 * const_ilog2(n) >> 16
1 + 77 * const_ilog2(n) >> 8
(the factors might be one off)
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- ge...@linux-m68k.org
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
