On Fri, Oct 6, 2023 at 4:49 PM Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote:
Currently, a Preemptible Kernel is only supported on the Coldfire CPU
family. Extend preempt support to the full Classic M68K CPU family
(68020+ with MMU, and 68000-derivatives without MMU).
Make sure preemption is disabled in loops involving cache and TLB
flushing.
Signed-off-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
---
Tested on ARAnyM, using none/voluntary/full preemption.
bloat-o-meter summaries for atari_defconfig:
PREEMPT_NONE -> PREEMPT_VOLUNTARY:
add/remove: 0/0 grow/shrink: 238/30 up/down: 2804/-748 (2056)
Total: Before=4478149, After=4480205, chg +0.05%
PREEMPT_VOLUNTARY -> PREEMPT:
add/remove: 735/277 grow/shrink: 3050/347 up/down: 244359/-11440 (232919)
Total: Before=4480205, After=4713124, chg +5.20%
Ouch.
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
