diff --git a/[refs] b/[refs]
index 75704f860ce1..a0c61595ed52 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 64253acbf189085fb0ceb9a3fbe43b40f4a0a932
+refs/heads/master: c58d92b233a41b81fbbea6add4ba1b512784f837
diff --git a/trunk/arch/s390/kernel/head31.S b/trunk/arch/s390/kernel/head31.S
index 7add8454773b..db476d114caa 100644
--- a/trunk/arch/s390/kernel/head31.S
+++ b/trunk/arch/s390/kernel/head31.S
@@ -29,7 +29,6 @@ startup_continue:
 	ahi	%r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union+THREAD_SIZE
 	st	%r15,__LC_KERNEL_STACK	# set end of kernel stack
 	ahi	%r15,-96
-	xc	__SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain
 #
 # Save ipl parameters, clear bss memory, initialize storage key for kernel pages,
 # and create a kernel NSS if the SAVESYS= parm is defined
diff --git a/trunk/arch/s390/kernel/head64.S b/trunk/arch/s390/kernel/head64.S
index b1a8ceb522b1..3ccd36b24b8f 100644
--- a/trunk/arch/s390/kernel/head64.S
+++ b/trunk/arch/s390/kernel/head64.S
@@ -96,7 +96,6 @@ startup_continue:
 	aghi	%r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union + THREAD_SIZE
 	stg	%r15,__LC_KERNEL_STACK	# set end of kernel stack
 	aghi	%r15,-160
-	xc	__SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain
 #
 # Save ipl parameters, clear bss memory, initialize storage key for kernel pages,
 # and create a kernel NSS if the SAVESYS= parm is defined