[MIPS] IP27: Fix modpost warning.

  MODPOST vmlinux.o
WARNING: vmlinux.o(.text+0x3180): Section mismatch: reference to .init.text:per_cpu_init (between 'prom_init_secondary' and 'alloc_cpupda')

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/sgi-ip27/ip27-smp.c b/arch/mips/sgi-ip27/ip27-smp.c
index 09fa7f5..08e7914 100644
--- a/arch/mips/sgi-ip27/ip27-smp.c
+++ b/arch/mips/sgi-ip27/ip27-smp.c
@@ -181,7 +181,7 @@
 		0, (void *) sp, (void *) gp);
 }
 
-void prom_init_secondary(void)
+void __cpuinit prom_init_secondary(void)
 {
 	per_cpu_init();
 	local_irq_enable();