[Linux-ia64] SMP TLB flushes

[Manfred Spraul <manfred@colorfullife.com>]

Is it correct that the SMP part of the SMP flushing code is still
missing? I'm just noisy and I don't understand yet how the ia64 cpu is
supposed to perform tlb flushes.

* ptc.g only gets the address and the size as parameters, but not a
region id. What if cpu 1 (running kswapd, arbitrary thread context)
wants to flush a page from another thread, and that thread is running on
cpu 2?

* could you add a big warning to start_lazy_tlb [kernel/exit.c] that the
function is unsafe?
Both ppc and ia64 scan the task list and assume that they can find each
mm_struct. If someone actually uses start_lazy_tlb, then that would be
incorrect.

Btw, the i386 tlb flush contained a single instruction race (read x,
write y instead of write y, read x) and this was enough for corruptions
- I overlooked one problem with concurrent tlb flushes and thread
switches.

Please cc me, I'm not subscribed to the list.

--
	Manfred