On Tue, 9 Nov 1999, Linus Torvalds wrote:
> That is in fact what Linux/SMP does in various situations: a "sti()" in an
> interrupt handler on SMP/i386 will be just a "local" sti(), while ir in
> normal situations will be a "global" sti().
That's the software version of priorities, on m68k this can be realized in
hardware with 7 levels, but we can't use it if everyone is allowed to play
with the interrupt mask.
bye, Roman
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