15 files changed, 60 insertions, 259 deletions

diff --git a/arch/s390/kernel/.gitignore b/arch/s390/kernel/.gitignore
new file mode 100644
index 000000000000..c5f676c3c224
--- /dev/null
+++ b/arch/s390/kernel/.gitignore
@@ -0,0 +1 @@
+vmlinux.lds
diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile
index 884b18afc864..9733b3f0eb6d 100644
--- a/arch/s390/kernel/Makefile
+++ b/arch/s390/kernel/Makefile
@@ -28,7 +28,7 @@ obj-y	:=  bitmap.o traps.o time.o process.o base.o early.o setup.o vtime.o \
 obj-y	+= $(if $(CONFIG_64BIT),entry64.o,entry.o)
 obj-y	+= $(if $(CONFIG_64BIT),reipl64.o,reipl.o)
 
-extra-y				+= head.o init_task.o vmlinux.lds
+extra-y				+= head.o vmlinux.lds
 extra-y				+= $(if $(CONFIG_64BIT),head64.o,head31.o)
 
 obj-$(CONFIG_MODULES)		+= s390_ksyms.o module.o
diff --git a/arch/s390/kernel/compat_signal.c b/arch/s390/kernel/compat_signal.c
index 28040fd5e8a2..377c096ca4a7 100644
--- a/arch/s390/kernel/compat_signal.c
+++ b/arch/s390/kernel/compat_signal.c
@@ -437,13 +437,6 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
 			sp = current->sas_ss_sp + current->sas_ss_size;
 	}
 
-	/* This is the legacy signal stack switching. */
-	else if (!user_mode(regs) &&
-		 !(ka->sa.sa_flags & SA_RESTORER) &&
-		 ka->sa.sa_restorer) {
-		sp = (unsigned long) ka->sa.sa_restorer;
-	}
-
 	return (void __user *)((sp - frame_size) & -8ul);
 }
 
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 9475e682727f..d84181f1f5e8 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -374,8 +374,6 @@ static __init void detect_machine_facilities(void)
 		S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS;
 	if (test_facility(40))
 		S390_lowcore.machine_flags |= MACHINE_FLAG_SPP;
-	if (test_facility(25))
-		S390_lowcore.machine_flags |= MACHINE_FLAG_STCKF;
 #endif
 }
 
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 74ee563fe62b..1ae93b573d7d 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -145,22 +145,23 @@ STACK_SIZE  = 1 << STACK_SHIFT
  *  gpr2 = prev
  */
 ENTRY(__switch_to)
+	stm	%r6,%r15,__SF_GPRS(%r15)	# store gprs of prev task
+	st	%r15,__THREAD_ksp(%r2)		# store kernel stack of prev
 	l	%r4,__THREAD_info(%r2)		# get thread_info of prev
 	l	%r5,__THREAD_info(%r3)		# get thread_info of next
+	lr	%r15,%r5
+	ahi	%r15,STACK_SIZE			# end of kernel stack of next
+	st	%r3,__LC_CURRENT		# store task struct of next
+	st	%r5,__LC_THREAD_INFO		# store thread info of next
+	st	%r15,__LC_KERNEL_STACK		# store end of kernel stack
+	lctl	%c4,%c4,__TASK_pid(%r3)		# load pid to control reg. 4
+	mvc	__LC_CURRENT_PID(4,%r0),__TASK_pid(%r3)	# store pid of next
+	l	%r15,__THREAD_ksp(%r3)		# load kernel stack of next
 	tm	__TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending?
 	jz	0f
 	ni	__TI_flags+3(%r4),255-_TIF_MCCK_PENDING	# clear flag in prev
 	oi	__TI_flags+3(%r5),_TIF_MCCK_PENDING	# set it in next
-0:	stm	%r6,%r15,__SF_GPRS(%r15)	# store gprs of prev task
-	st	%r15,__THREAD_ksp(%r2)		# store kernel stack of prev
-	l	%r15,__THREAD_ksp(%r3)		# load kernel stack of next
-	lctl	%c4,%c4,__TASK_pid(%r3)		# load pid to control reg. 4
-	lm	%r6,%r15,__SF_GPRS(%r15)	# load gprs of next task
-	st	%r3,__LC_CURRENT		# store task struct of next
-	mvc	__LC_CURRENT_PID(4,%r0),__TASK_pid(%r3)	# store pid of next
-	st	%r5,__LC_THREAD_INFO		# store thread info of next
-	ahi	%r5,STACK_SIZE			# end of kernel stack of next
-	st	%r5,__LC_KERNEL_STACK		# store end of kernel stack
+0:	lm	%r6,%r15,__SF_GPRS(%r15)	# load gprs of next task
 	br	%r14
 
 __critical_start:
diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S
index 4e1c292fa7e3..229fe1d07749 100644
--- a/arch/s390/kernel/entry64.S
+++ b/arch/s390/kernel/entry64.S
@@ -81,16 +81,14 @@ _TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING)
 
 	.macro	HANDLE_SIE_INTERCEPT scratch
 #if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
-	tm	__TI_flags+6(%r12),_TIF_SIE>>8
-	jz	.+42
-	tm	__LC_MACHINE_FLAGS+6,0x20	# MACHINE_FLAG_SPP
-	jz	.+8
-	.insn	s,0xb2800000,BASED(.Lhost_id)	# set host id
+	tmhh	%r8,0x0001		# interrupting from user ?
+	jnz	.+42
 	lgr	\scratch,%r9
 	slg	\scratch,BASED(.Lsie_loop)
 	clg	\scratch,BASED(.Lsie_length)
-	jhe	.+10
+	jhe	.+22
 	lg	%r9,BASED(.Lsie_loop)
+	SPP	BASED(.Lhost_id)	# set host id
 #endif
 	.endm
 
@@ -148,6 +146,14 @@ _TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING)
 	ssm	__LC_RETURN_PSW
 	.endm
 
+	.macro STCK savearea
+#ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES
+	.insn	s,0xb27c0000,\savearea		# store clock fast
+#else
+	.insn	s,0xb2050000,\savearea		# store clock
+#endif
+	.endm
+
 	.section .kprobes.text, "ax"
 
 /*
@@ -158,22 +164,23 @@ _TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING)
  *  gpr2 = prev
  */
 ENTRY(__switch_to)
+	stmg	%r6,%r15,__SF_GPRS(%r15)	# store gprs of prev task
+	stg	%r15,__THREAD_ksp(%r2)		# store kernel stack of prev
 	lg	%r4,__THREAD_info(%r2)		# get thread_info of prev
 	lg	%r5,__THREAD_info(%r3)		# get thread_info of next
+	lgr	%r15,%r5
+	aghi	%r15,STACK_SIZE			# end of kernel stack of next
+	stg	%r3,__LC_CURRENT		# store task struct of next
+	stg	%r5,__LC_THREAD_INFO		# store thread info of next
+	stg	%r15,__LC_KERNEL_STACK		# store end of kernel stack
+	lctl	%c4,%c4,__TASK_pid(%r3)		# load pid to control reg. 4
+	mvc	__LC_CURRENT_PID+4(4,%r0),__TASK_pid(%r3) # store pid of next
+	lg	%r15,__THREAD_ksp(%r3)		# load kernel stack of next
 	tm	__TI_flags+7(%r4),_TIF_MCCK_PENDING # machine check pending?
 	jz	0f
 	ni	__TI_flags+7(%r4),255-_TIF_MCCK_PENDING	# clear flag in prev
 	oi	__TI_flags+7(%r5),_TIF_MCCK_PENDING	# set it in next
-0:	stmg	%r6,%r15,__SF_GPRS(%r15)	# store gprs of prev task
-	stg	%r15,__THREAD_ksp(%r2)		# store kernel stack of prev
-	lg	%r15,__THREAD_ksp(%r3)		# load kernel stack of next
-	lctl	%c4,%c4,__TASK_pid(%r3)		# load pid to control reg. 4
-	lmg	%r6,%r15,__SF_GPRS(%r15)	# load gprs of next task
-	stg	%r3,__LC_CURRENT		# store task struct of next
-	mvc	__LC_CURRENT_PID+4(4,%r0),__TASK_pid(%r3) # store pid of next
-	stg	%r5,__LC_THREAD_INFO		# store thread info of next
-	aghi	%r5,STACK_SIZE			# end of kernel stack of next
-	stg	%r5,__LC_KERNEL_STACK		# store end of kernel stack
+0:	lmg	%r6,%r15,__SF_GPRS(%r15)	# load gprs of next task
 	br	%r14
 
 __critical_start:
@@ -458,7 +465,7 @@ pgm_svcper:
  * IO interrupt handler routine
  */
 ENTRY(io_int_handler)
-	stck	__LC_INT_CLOCK
+	STCK	__LC_INT_CLOCK
 	stpt	__LC_ASYNC_ENTER_TIMER
 	stmg	%r8,%r15,__LC_SAVE_AREA_ASYNC
 	lg	%r10,__LC_LAST_BREAK
@@ -604,7 +611,7 @@ io_notify_resume:
  * External interrupt handler routine
  */
 ENTRY(ext_int_handler)
-	stck	__LC_INT_CLOCK
+	STCK	__LC_INT_CLOCK
 	stpt	__LC_ASYNC_ENTER_TIMER
 	stmg	%r8,%r15,__LC_SAVE_AREA_ASYNC
 	lg	%r10,__LC_LAST_BREAK
@@ -622,6 +629,7 @@ ext_skip:
 	mvc	__PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
 	stmg	%r8,%r9,__PT_PSW(%r11)
 	TRACE_IRQS_OFF
+	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
 	lghi	%r1,4096
 	lgr	%r2,%r11		# pass pointer to pt_regs
 	llgf	%r3,__LC_EXT_CPU_ADDR	# get cpu address + interruption code
@@ -638,7 +646,7 @@ ENTRY(psw_idle)
 	larl	%r1,psw_idle_lpsw+4
 	stg	%r1,__SF_EMPTY+8(%r15)
 	larl	%r1,.Lvtimer_max
-	stck	__IDLE_ENTER(%r2)
+	STCK	__IDLE_ENTER(%r2)
 	ltr	%r5,%r5
 	stpt	__VQ_IDLE_ENTER(%r3)
 	jz	psw_idle_lpsw
@@ -654,7 +662,7 @@ __critical_end:
  * Machine check handler routines
  */
 ENTRY(mcck_int_handler)
-	stck	__LC_MCCK_CLOCK
+	STCK	__LC_MCCK_CLOCK
 	la	%r1,4095		# revalidate r1
 	spt	__LC_CPU_TIMER_SAVE_AREA-4095(%r1)	# revalidate cpu timer
 	lmg	%r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs
@@ -967,7 +975,6 @@ ENTRY(sie64a)
 	xc	__SF_EMPTY+16(8,%r15),__SF_EMPTY+16(%r15) # host id == 0
 	lmg	%r0,%r13,0(%r3)			# load guest gprs 0-13
 	lg	%r14,__LC_THREAD_INFO		# pointer thread_info struct
-	oi	__TI_flags+6(%r14),_TIF_SIE>>8
 sie_loop:
 	lg	%r14,__LC_THREAD_INFO		# pointer thread_info struct
 	tm	__TI_flags+7(%r14),_TIF_EXIT_SIE
@@ -985,7 +992,6 @@ sie_done:
 	lg	%r14,__LC_THREAD_INFO		# pointer thread_info struct
 sie_exit:
 	lctlg	%c1,%c1,__LC_USER_ASCE		# load primary asce
-	ni	__TI_flags+6(%r14),255-(_TIF_SIE>>8)
 	lg	%r14,__SF_EMPTY+8(%r15)		# load guest register save area
 	stmg	%r0,%r13,0(%r14)		# save guest gprs 0-13
 	lmg	%r6,%r14,__SF_GPRS(%r15)	# restore kernel registers
@@ -994,7 +1000,6 @@ sie_exit:
 sie_fault:
 	lctlg	%c1,%c1,__LC_USER_ASCE		# load primary asce
 	lg	%r14,__LC_THREAD_INFO		# pointer thread_info struct
-	ni	__TI_flags+6(%r14),255-(_TIF_SIE>>8)
 	lg	%r14,__SF_EMPTY+8(%r15)		# load guest register save area
 	stmg	%r0,%r13,0(%r14)		# save guest gprs 0-13
 	lmg	%r6,%r14,__SF_GPRS(%r15)	# restore kernel registers
diff --git a/arch/s390/kernel/head.S b/arch/s390/kernel/head.S
index c27a0727f930..4939d15375aa 100644
--- a/arch/s390/kernel/head.S
+++ b/arch/s390/kernel/head.S
@@ -34,125 +34,7 @@
 #endif
 
 __HEAD
-#ifndef CONFIG_IPL
-	.org   0
-	.long  0x00080000,0x80000000+startup	# Just a restart PSW
-#else
-#ifdef CONFIG_IPL_TAPE
-#define IPL_BS 1024
-	.org   0
-	.long  0x00080000,0x80000000+iplstart	# The first 24 bytes are loaded
-	.long  0x27000000,0x60000001		# by ipl to addresses 0-23.
-	.long  0x02000000,0x20000000+IPL_BS	# (a PSW and two CCWs).
-	.long  0x00000000,0x00000000		# external old psw
-	.long  0x00000000,0x00000000		# svc old psw
-	.long  0x00000000,0x00000000		# program check old psw
-	.long  0x00000000,0x00000000		# machine check old psw
-	.long  0x00000000,0x00000000		# io old psw
-	.long  0x00000000,0x00000000
-	.long  0x00000000,0x00000000
-	.long  0x00000000,0x00000000
-	.long  0x000a0000,0x00000058		# external new psw
-	.long  0x000a0000,0x00000060		# svc new psw
-	.long  0x000a0000,0x00000068		# program check new psw
-	.long  0x000a0000,0x00000070		# machine check new psw
-	.long  0x00080000,0x80000000+.Lioint	# io new psw
 
-	.org   0x100
-#
-# subroutine for loading from tape
-# Parameters:
-#  R1 = device number
-#  R2 = load address
-.Lloader:
-	st	%r14,.Lldret
-	la	%r3,.Lorbread		# r3 = address of orb
-	la	%r5,.Lirb		# r5 = address of irb
-	st	%r2,.Lccwread+4 	# initialize CCW data addresses
-	lctl	%c6,%c6,.Lcr6
-	slr	%r2,%r2
-.Lldlp:
-	la	%r6,3			# 3 retries
-.Lssch:
-	ssch	0(%r3)			# load chunk of IPL_BS bytes
-	bnz	.Llderr
-.Lw4end:
-	bas	%r14,.Lwait4io
-	tm	8(%r5),0x82		# do we have a problem ?
-	bnz	.Lrecov
-	slr	%r7,%r7
-	icm	%r7,3,10(%r5)		# get residual count
-	lcr	%r7,%r7
-	la	%r7,IPL_BS(%r7) 	# IPL_BS-residual=#bytes read
-	ar	%r2,%r7 		# add to total size
-	tm	8(%r5),0x01		# found a tape mark ?
-	bnz	.Ldone
-	l	%r0,.Lccwread+4 	# update CCW data addresses
-	ar	%r0,%r7
-	st	%r0,.Lccwread+4
-	b	.Lldlp
-.Ldone:
-	l	%r14,.Lldret
-	br	%r14			# r2 contains the total size
-.Lrecov:
-	bas	%r14,.Lsense		# do the sensing
-	bct	%r6,.Lssch		# dec. retry count & branch
-	b	.Llderr
-#
-# Sense subroutine
-#
-.Lsense:
-	st	%r14,.Lsnsret
-	la	%r7,.Lorbsense
-	ssch	0(%r7)			# start sense command
-	bnz	.Llderr
-	bas	%r14,.Lwait4io
-	l	%r14,.Lsnsret
-	tm	8(%r5),0x82		# do we have a problem ?
-	bnz	.Llderr
-	br	%r14
-#
-# Wait for interrupt subroutine
-#
-.Lwait4io:
-	lpsw	.Lwaitpsw
-.Lioint:
-	c	%r1,0xb8		# compare subchannel number
-	bne	.Lwait4io
-	tsch	0(%r5)
-	slr	%r0,%r0
-	tm	8(%r5),0x82		# do we have a problem ?
-	bnz	.Lwtexit
-	tm	8(%r5),0x04		# got device end ?
-	bz	.Lwait4io
-.Lwtexit:
-	br	%r14
-.Llderr:
-	lpsw	.Lcrash
-
-	.align	8
-.Lorbread:
-	.long	0x00000000,0x0080ff00,.Lccwread
-	.align	8
-.Lorbsense:
-	.long	0x00000000,0x0080ff00,.Lccwsense
-	.align	8
-.Lccwread:
-	.long	0x02200000+IPL_BS,0x00000000
-.Lccwsense:
-	.long	0x04200001,0x00000000
-.Lwaitpsw:
-	.long	0x020a0000,0x80000000+.Lioint
-
-.Lirb:	.long	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
-.Lcr6:	.long	0xff000000
-	.align	8
-.Lcrash:.long	0x000a0000,0x00000000
-.Lldret:.long	0
-.Lsnsret: .long 0
-#endif	/* CONFIG_IPL_TAPE */
-
-#ifdef CONFIG_IPL_VM
 #define IPL_BS	0x730
 	.org	0
 	.long	0x00080000,0x80000000+iplstart	# The first 24 bytes are loaded
@@ -256,7 +138,6 @@ __HEAD
 	.long	0x02600050,0x00000000
 	.endr
 	.long	0x02200050,0x00000000
-#endif	/* CONFIG_IPL_VM */
 
 iplstart:
 	lh	%r1,0xb8		# test if subchannel number
@@ -325,7 +206,6 @@ iplstart:
 	clc	0(3,%r2),.L_eof
 	bz	.Lagain2
 
-#ifdef CONFIG_IPL_VM
 #
 # reset files in VM reader
 #
@@ -358,7 +238,6 @@ iplstart:
 	.long	0x00080000,0x80000000+.Lrdrint
 .Lrdrwaitpsw:
 	.long	0x020a0000,0x80000000+.Lrdrint
-#endif
 
 #
 # everything loaded, go for it
@@ -376,8 +255,6 @@ iplstart:
 .L_eof: .long	0xc5d6c600	 /* C'EOF' */
 .L_hdr: .long	0xc8c4d900	 /* C'HDR' */
 
-#endif	/* CONFIG_IPL */
-
 #
 # SALIPL loader support. Based on a patch by Rob van der Heij.
 # This entry point is called directly from the SALIPL loader and
@@ -474,9 +351,9 @@ ENTRY(startup_kdump)
 	stck	__LC_LAST_UPDATE_CLOCK
 	spt	5f-.LPG0(%r13)
 	mvc	__LC_LAST_UPDATE_TIMER(8),5f-.LPG0(%r13)
+	xc	__LC_STFL_FAC_LIST(8),__LC_STFL_FAC_LIST
 #ifndef CONFIG_MARCH_G5
 	# check capabilities against MARCH_{G5,Z900,Z990,Z9_109,Z10}
-	xc	__LC_STFL_FAC_LIST(8),__LC_STFL_FAC_LIST
 	.insn	s,0xb2b10000,__LC_STFL_FAC_LIST	# store facility list
 	tm	__LC_STFL_FAC_LIST,0x01	# stfle available ?
 	jz	0f
diff --git a/arch/s390/kernel/init_task.c b/arch/s390/kernel/init_task.c
deleted file mode 100644
index 4d1c9fb0b540..000000000000
--- a/arch/s390/kernel/init_task.c
+++ /dev/null
@@ -1,38 +0,0 @@
-/*
- *  arch/s390/kernel/init_task.c
- *
- *  S390 version
- *
- *  Derived from "arch/i386/kernel/init_task.c"
- */
-
-#include <linux/mm.h>
-#include <linux/fs.h>
-#include <linux/module.h>
-#include <linux/sched.h>
-#include <linux/init_task.h>
-#include <linux/mqueue.h>
-
-#include <asm/uaccess.h>
-#include <asm/pgtable.h>
-
-static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
-static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
-/*
- * Initial thread structure.
- *
- * We need to make sure that this is THREAD_SIZE aligned due to the
- * way process stacks are handled. This is done by having a special
- * "init_task" linker map entry..
- */
-union thread_union init_thread_union __init_task_data =
-	{ INIT_THREAD_INFO(init_task) };
-
-/*
- * Initial task structure.
- *
- * All other task structs will be allocated on slabs in fork.c
- */
-struct task_struct init_task = INIT_TASK(init_task);
-
-EXPORT_SYMBOL(init_task);
diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c
index 1c2cdd59ccd0..8a22c27219dd 100644
--- a/arch/s390/kernel/irq.c
+++ b/arch/s390/kernel/irq.c
@@ -118,9 +118,10 @@ asmlinkage void do_softirq(void)
 				         "a" (__do_softirq)
 				     : "0", "1", "2", "3", "4", "5", "14",
 				       "cc", "memory" );
-		} else
+		} else {
 			/* We are already on the async stack. */
 			__do_softirq();
+		}
 	}
 
 	local_irq_restore(flags);
@@ -192,11 +193,12 @@ int unregister_external_interrupt(u16 code, ext_int_handler_t handler)
 	int index = ext_hash(code);
 
 	spin_lock_irqsave(&ext_int_hash_lock, flags);
-	list_for_each_entry_rcu(p, &ext_int_hash[index], entry)
+	list_for_each_entry_rcu(p, &ext_int_hash[index], entry) {
 		if (p->code == code && p->handler == handler) {
 			list_del_rcu(&p->entry);
 			kfree_rcu(p, rcu);
 		}
+	}
 	spin_unlock_irqrestore(&ext_int_hash_lock, flags);
 	return 0;
 }
@@ -211,9 +213,10 @@ void __irq_entry do_extint(struct pt_regs *regs, struct ext_code ext_code,
 
 	old_regs = set_irq_regs(regs);
 	irq_enter();
-	if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator)
+	if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator) {
 		/* Serve timer interrupts first. */
 		clock_comparator_work();
+	}
 	kstat_cpu(smp_processor_id()).irqs[EXTERNAL_INTERRUPT]++;
 	if (ext_code.code != 0x1004)
 		__get_cpu_var(s390_idle).nohz_delay = 1;
diff --git a/arch/s390/kernel/perf_cpum_cf.c b/arch/s390/kernel/perf_cpum_cf.c
index 46405086479c..cb019f429e88 100644
--- a/arch/s390/kernel/perf_cpum_cf.c
+++ b/arch/s390/kernel/perf_cpum_cf.c
@@ -178,7 +178,7 @@ static void cpumf_pmu_enable(struct pmu *pmu)
 	err = lcctl(cpuhw->state);
 	if (err) {
 		pr_err("Enabling the performance measuring unit "
-		       "failed with rc=%lx\n", err);
+		       "failed with rc=%x\n", err);
 		return;
 	}
 
@@ -203,7 +203,7 @@ static void cpumf_pmu_disable(struct pmu *pmu)
 	err = lcctl(inactive);
 	if (err) {
 		pr_err("Disabling the performance measuring unit "
-		       "failed with rc=%lx\n", err);
+		       "failed with rc=%x\n", err);
 		return;
 	}
 
diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c
index 02f300fbf070..4993e689b2c2 100644
--- a/arch/s390/kernel/ptrace.c
+++ b/arch/s390/kernel/ptrace.c
@@ -719,7 +719,7 @@ asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
 	long ret = 0;
 
 	/* Do the secure computing check first. */
-	secure_computing(regs->gprs[2]);
+	secure_computing_strict(regs->gprs[2]);
 
 	/*
 	 * The sysc_tracesys code in entry.S stored the system
diff --git a/arch/s390/kernel/signal.c b/arch/s390/kernel/signal.c
index f7582b27f600..8a4e2b760d56 100644
--- a/arch/s390/kernel/signal.c
+++ b/arch/s390/kernel/signal.c
@@ -235,13 +235,6 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
 			sp = current->sas_ss_sp + current->sas_ss_size;
 	}
 
-	/* This is the legacy signal stack switching. */
-	else if (!user_mode(regs) &&
-		 !(ka->sa.sa_flags & SA_RESTORER) &&
-		 ka->sa.sa_restorer) {
-		sp = (unsigned long) ka->sa.sa_restorer;
-	}
-
 	return (void __user *)((sp - frame_size) & -8ul);
 }
 
@@ -414,15 +407,6 @@ void do_signal(struct pt_regs *regs)
 	struct k_sigaction ka;
 	sigset_t *oldset;
 
-	/*
-	 * We want the common case to go fast, which
-	 * is why we may in certain cases get here from
-	 * kernel mode. Just return without doing anything
-	 * if so.
-	 */
-	if (!user_mode(regs))
-		return;
-
 	if (test_thread_flag(TIF_RESTORE_SIGMASK))
 		oldset = &current->saved_sigmask;
 	else
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 1f77227669e8..647ba9425893 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -85,7 +85,6 @@ enum {
 
 struct pcpu {
 	struct cpu cpu;
-	struct task_struct *idle;	/* idle process for the cpu */
 	struct _lowcore *lowcore;	/* lowcore page(s) for the cpu */
 	unsigned long async_stack;	/* async stack for the cpu */
 	unsigned long panic_stack;	/* panic stack for the cpu */
@@ -226,6 +225,8 @@ out:
 	return -ENOMEM;
 }
 
+#ifdef CONFIG_HOTPLUG_CPU
+
 static void pcpu_free_lowcore(struct pcpu *pcpu)
 {
 	pcpu_sigp_retry(pcpu, sigp_set_prefix, 0);
@@ -247,6 +248,8 @@ static void pcpu_free_lowcore(struct pcpu *pcpu)
 	}
 }
 
+#endif /* CONFIG_HOTPLUG_CPU */
+
 static void pcpu_prepare_secondary(struct pcpu *pcpu, int cpu)
 {
 	struct _lowcore *lc = pcpu->lowcore;
@@ -721,26 +724,9 @@ static void __cpuinit smp_start_secondary(void *cpuvoid)
 	cpu_idle();
 }
 
-struct create_idle {
-	struct work_struct work;
-	struct task_struct *idle;
-	struct completion done;
-	int cpu;
-};
-
-static void __cpuinit smp_fork_idle(struct work_struct *work)
-{
-	struct create_idle *c_idle;
-
-	c_idle = container_of(work, struct create_idle, work);
-	c_idle->idle = fork_idle(c_idle->cpu);
-	complete(&c_idle->done);
-}
-
 /* Upping and downing of CPUs */
-int __cpuinit __cpu_up(unsigned int cpu)
+int __cpuinit __cpu_up(unsigned int cpu, struct task_struct *tidle)
 {
-	struct create_idle c_idle;
 	struct pcpu *pcpu;
 	int rc;
 
@@ -750,22 +736,12 @@ int __cpuinit __cpu_up(unsigned int cpu)
 	if (pcpu_sigp_retry(pcpu, sigp_initial_cpu_reset, 0) !=
 	    sigp_order_code_accepted)
 		return -EIO;
-	if (!pcpu->idle) {
-		c_idle.done = COMPLETION_INITIALIZER_ONSTACK(c_idle.done);
-		INIT_WORK_ONSTACK(&c_idle.work, smp_fork_idle);
-		c_idle.cpu = cpu;
-		schedule_work(&c_idle.work);
-		wait_for_completion(&c_idle.done);
-		if (IS_ERR(c_idle.idle))
-			return PTR_ERR(c_idle.idle);
-		pcpu->idle = c_idle.idle;
-	}
-	init_idle(pcpu->idle, cpu);
+
 	rc = pcpu_alloc_lowcore(pcpu, cpu);
 	if (rc)
 		return rc;
 	pcpu_prepare_secondary(pcpu, cpu);
-	pcpu_attach_task(pcpu, pcpu->idle);
+	pcpu_attach_task(pcpu, tidle);
 	pcpu_start_fn(pcpu, smp_start_secondary, NULL);
 	while (!cpu_online(cpu))
 		cpu_relax();
@@ -852,7 +828,6 @@ void __init smp_prepare_boot_cpu(void)
 	struct pcpu *pcpu = pcpu_devices;
 
 	boot_cpu_address = stap();
-	pcpu->idle = current;
 	pcpu->state = CPU_STATE_CONFIGURED;
 	pcpu->address = boot_cpu_address;
 	pcpu->lowcore = (struct _lowcore *)(unsigned long) store_prefix();
diff --git a/arch/s390/kernel/vdso32/.gitignore b/arch/s390/kernel/vdso32/.gitignore
new file mode 100644
index 000000000000..e45fba9d0ced
--- /dev/null
+++ b/arch/s390/kernel/vdso32/.gitignore
@@ -0,0 +1 @@
+vdso32.lds
diff --git a/arch/s390/kernel/vdso64/.gitignore b/arch/s390/kernel/vdso64/.gitignore
new file mode 100644
index 000000000000..3fd18cf9fec2
--- /dev/null
+++ b/arch/s390/kernel/vdso64/.gitignore
@@ -0,0 +1 @@
+vdso64.lds