diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index 4898e9491a1c..3fad8d499767 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -801,21 +801,19 @@ __secondary_start:
 	/* Set thread priority to MEDIUM */
 	HMT_MEDIUM
 
-	/* Initialize the kernel stack */
-	LOAD_REG_ADDR(r3, current_set)
-	sldi	r28,r24,3		/* get current_set[cpu#]	 */
-	ldx	r14,r3,r28
-	addi	r14,r14,THREAD_SIZE-STACK_FRAME_OVERHEAD
-	std	r14,PACAKSAVE(r13)
-
-	/* Do early setup for that CPU (SLB and hash table pointer) */
+	/*
+	 * Do early setup for this CPU, in particular initialising the MMU so we
+	 * can turn it on below. This is a call to C, which is OK, we're still
+	 * running on the emergency stack.
+	 */
 	bl	early_setup_secondary
 
 	/*
-	 * setup the new stack pointer, but *don't* use this until
-	 * translation is on.
+	 * The primary has initialized our kernel stack for us in the paca, grab
+	 * it and put it in r1. We must *not* use it until we turn on the MMU
+	 * below, because it may not be inside the RMO.
 	 */
-	mr	r1, r14
+	ld	r1, PACAKSAVE(r13)
 
 	/* Clear backchain so we get nice backtraces */
 	li	r7,0