I'm optimizing the tlb flush code for i386, and I noticed a potential
lock-up on Alpha:
try_to_swap_out() is called with current->mm->page_table_lock (that's a
spinlock) acquired, and that function calls flush_tlb_page().
On Alpha SMP, flush_tlb_page() calls smp_call_function(), and that
function uses pointer_lock() for synchronization. pointer_lock() calls
schedule() --> lock-up.
I haven't checked the other SMP capable architectures.
The tlb flush functions are never called from interrupt or bottom half
handlers, ie a normal spinlock() instead of pointer_lock() should fix
the problem.
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