powerpc/64: Setup KUP on secondary CPUs

Some platforms (i.e. Radix MMU) need per-CPU initialisation for KUP.

Any platforms that only want to do KUP initialisation once
globally can just check to see if they're running on the boot CPU, or
check if whatever setup they need has already been performed.

Note that this is only for 64-bit.
Signed-off-by: Russell Currey <ruscur@russell.cc>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/kernel/setup_64.c

@@ -390,6 +390,9 @@ void early_setup_secondary(void)
 	/* Initialize the hash table or TLB handling */
 	early_init_mmu_secondary();
 
+	/* Perform any KUP setup that is per-cpu */
+	setup_kup();
+
 	/*
 	 * At this point, we can let interrupts switch to virtual mode
 	 * (the MMU has been setup), so adjust the MSR in the PACA to

arch/powerpc/mm/init-common.c

@@ -45,7 +45,7 @@ static int __init parse_nosmap(char *p)
 }
 early_param("nosmap", parse_nosmap);
 
-void __init setup_kup(void)
+void setup_kup(void)
 {
 	setup_kuep(disable_kuep);
 	setup_kuap(disable_kuap);