[SPARC64]: Fix new context version SMP handling.

Don't piggy back the SMP receive signal code to do the
context version change handling.

Instead allocate another fixed PIL number for this
asynchronous cross-call.  We can't use smp_call_function()
because this thing is invoked with interrupts disabled
and a few spinlocks held.

Also, fix smp_call_function_mask() to count "cpus" correctly.
There is no guarentee that the local cpu is in the mask
yet that is exactly what this code was assuming.

Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc64/mm/ultra.S

@@ -673,6 +673,11 @@ xcall_capture:
 	wr		%g0, (1 << PIL_SMP_CAPTURE), %set_softint
 	retry
 
+	.globl		xcall_new_mmu_context_version
+xcall_new_mmu_context_version:
+	wr		%g0, (1 << PIL_SMP_CTX_NEW_VERSION), %set_softint
+	retry
+
 #endif /* CONFIG_SMP */