* David Mosberger-Tang <[email protected]> wrote:
> > 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!
we'll see. The patch certainly needs more testing. Generally we do
switch_mm()'s outside of the scheduler as well, without disabling
interrupts.
Ingo
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