diff --git a/arch/powerpc/include/asm/ptrace.h b/arch/powerpc/include/asm/ptrace.h
index f73886a1a7f51714da637c0f9c81a8dfd1107b7f..0b8a735b6d85f08512143b539c5ee5329598c48c 100644
--- a/arch/powerpc/include/asm/ptrace.h
+++ b/arch/powerpc/include/asm/ptrace.h
@@ -54,6 +54,7 @@ struct pt_regs
 
 #ifdef CONFIG_PPC64
 	unsigned long ppr;
+	unsigned long __pad;	/* Maintain 16 byte interrupt stack alignment */
 #endif
 };
 #endif
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 2a51e4cc8246d35d18d8ddd54b258af02dda47c4..236c1151a3a77057013313ed5da588673f5f3419 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -636,6 +636,8 @@ static void *__init alloc_stack(unsigned long limit, int cpu)
 {
 	unsigned long pa;
 
+	BUILD_BUG_ON(STACK_INT_FRAME_SIZE % 16);
+
 	pa = memblock_alloc_base_nid(THREAD_SIZE, THREAD_SIZE, limit,
 					early_cpu_to_node(cpu), MEMBLOCK_NONE);
 	if (!pa) {