RE: [11/14] vcompound: Fallbacks for order 1 stack allocations on IA64 and x86

Luck, Tony
2008-03-24T21:13:38Z

> I am familiar with that area and I am resonably sure that this
> is an issue on IA64 under some conditions (the processor decides to spill
> some registers either onto the stack or into the register backing store
> during tlb processing). Recursion (in the kernel context) still expects
> the stack and register backing store to be available. ccing linux-ia64 for
> any thoughts to the contrary.

Christoph is correct ... IA64 pins the TLB entry for the kernel stack
(which covers both the normal C stack and the register backing store)
so that it won't have to deal with a TLB miss on the stack while handling
another TLB miss.

-Tony