> Tony:
>> Ingo:
>> tested on x86, and all other arches should work as well, but if an
>> architecture has irqs-off assumptions in its switch_to() logic it
>> might break. (I havent found any but there may such assumptions.)
> The ia64_switch_to() code includes a section that can change a
> pinned MMU mapping (when the stack for the new process is in a
> different granule from the stack for the old process). The code
> beyond the ".map" label in arch/ia64/kernel/entry.S includes the
> comment:
Also, there was a nasty dead-lock that could trigger if the
context-switch was interrupted by a TLB flush IPI. I don't remember
the details offhand, but I'm pretty sure it had to do with
switch_mm(), so I suspect it may not be enough to disable irqs just
for ia64_switch_to(). Tread with care!
--david
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