Blackfin: SMP: PERCPU section should be PAGE aligned

Common code checks the alignment of some of the variables and calls BUG()
if they aren't page aligned.

Signed-off-by: steven miao <realmz6@gmail.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/blackfin/kernel/vmlinux.lds.S b/arch/blackfin/kernel/vmlinux.lds.S
index c40d07f..f5fd234 100644
--- a/arch/blackfin/kernel/vmlinux.lds.S
+++ b/arch/blackfin/kernel/vmlinux.lds.S
@@ -136,7 +136,7 @@
 
 	. = ALIGN(16);
 	INIT_DATA_SECTION(16)
-	PERCPU(32, 4)
+	PERCPU(32, PAGE_SIZE)
 
 	.exit.data :
 	{