Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 updates from Martin Schwidefsky:
 "The s390 patches for the 4.7 merge window have the usual bug fixes and
  cleanups, and the following new features:

   - An interface for dasd driver to query if a volume is online to
     another operating system

   - A new ioctl for the dasd driver to verify the format for a range of
     tracks

   - Following the example of x86 the struct fpu is now allocated with
     the task_struct

   - The 'report_error' interface for the PCI bus to send an
     adapter-error notification from user space to the service element
     of the machine"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (29 commits)
  s390/vmem: remove unused function parameter
  s390/vmem: fix identity mapping
  s390: add missing include statements
  s390: add missing declarations
  s390: make couple of variables and functions static
  s390/cache: remove superfluous locking
  s390/cpuinfo: simplify locking and skip offline cpus early
  s390/3270: hangup the 3270 tty after a disconnect
  s390/3270: handle reconnect of a tty with a different size
  s390/3270: avoid endless I/O loop with disconnected 3270 terminals
  s390/3270: fix garbled output on 3270 tty view
  s390/3270: fix view reference counting
  s390/3270: add missing tty_kref_put
  s390/dumpstack: implement and use return_address()
  s390/cpum_sf: Remove superfluous SMP function call
  s390/cpum_cf: Remove superfluous SMP function call
  s390/Kconfig: make z196 the default processor type
  s390/sclp: avoid compile warning in sclp_pci_report
  s390/fpu: allocate 'struct fpu' with the task_struct
  s390/crypto: cleanup and move the header with the cpacf definitions
  ...

arch/s390/kernel/cache.c

@@ -72,7 +72,6 @@ void show_cacheinfo(struct seq_file *m)
 
 	if (!test_facility(34))
 		return;
-	get_online_cpus();
 	this_cpu_ci = get_cpu_cacheinfo(cpumask_any(cpu_online_mask));
 	for (idx = 0; idx < this_cpu_ci->num_leaves; idx++) {
 		cache = this_cpu_ci->info_list + idx;
@@ -86,7 +85,6 @@ void show_cacheinfo(struct seq_file *m)
 		seq_printf(m, "associativity=%d", cache->ways_of_associativity);
 		seq_puts(m, "\n");
 	}
-	put_online_cpus();
 }
 
 static inline enum cache_type get_cache_type(struct cache_info *ci, int level)

arch/s390/kernel/crash_dump.c

@@ -173,7 +173,7 @@ int copy_oldmem_kernel(void *dst, void *src, size_t count)
 /*
  * Copy memory of the old, dumped system to a user space virtual address
  */
-int copy_oldmem_user(void __user *dst, void *src, size_t count)
+static int copy_oldmem_user(void __user *dst, void *src, size_t count)
 {
 	unsigned long from, len;
 	int rc;

arch/s390/kernel/dumpstack.c

@@ -89,6 +89,30 @@ void dump_trace(dump_trace_func_t func, void *data, struct task_struct *task,
 }
 EXPORT_SYMBOL_GPL(dump_trace);
 
+struct return_address_data {
+	unsigned long address;
+	int depth;
+};
+
+static int __return_address(void *data, unsigned long address)
+{
+	struct return_address_data *rd = data;
+
+	if (rd->depth--)
+		return 0;
+	rd->address = address;
+	return 1;
+}
+
+unsigned long return_address(int depth)
+{
+	struct return_address_data rd = { .depth = depth + 2 };
+
+	dump_trace(__return_address, &rd, NULL, current_stack_pointer());
+	return rd.address;
+}
+EXPORT_SYMBOL_GPL(return_address);
+
 static int show_address(void *data, unsigned long address)
 {
 	printk("([<%016lx>] %pSR)\n", address, (void *)address);

arch/s390/kernel/entry.h

@@ -1,6 +1,7 @@
 #ifndef _ENTRY_H
 #define _ENTRY_H
 
+#include <linux/percpu.h>
 #include <linux/types.h>
 #include <linux/signal.h>
 #include <asm/ptrace.h>
@@ -75,4 +76,7 @@ long sys_s390_personality(unsigned int personality);
 long sys_s390_runtime_instr(int command, int signum);
 long sys_s390_pci_mmio_write(unsigned long, const void __user *, size_t);
 long sys_s390_pci_mmio_read(unsigned long, void __user *, size_t);
+
+DECLARE_PER_CPU(u64, mt_cycles[8]);
+
 #endif /* _ENTRY_H */

arch/s390/kernel/perf_cpum_cf.c

@@ -665,18 +665,21 @@ static struct pmu cpumf_pmu = {
 static int cpumf_pmu_notifier(struct notifier_block *self, unsigned long action,
 			      void *hcpu)
 {
-	unsigned int cpu = (long) hcpu;
 	int flags;
 
 	switch (action & ~CPU_TASKS_FROZEN) {
 	case CPU_ONLINE:
 	case CPU_DOWN_FAILED:
 		flags = PMC_INIT;
-		smp_call_function_single(cpu, setup_pmc_cpu, &flags, 1);
+		local_irq_disable();
+		setup_pmc_cpu(&flags);
+		local_irq_enable();
 		break;
 	case CPU_DOWN_PREPARE:
 		flags = PMC_RELEASE;
-		smp_call_function_single(cpu, setup_pmc_cpu, &flags, 1);
+		local_irq_disable();
+		setup_pmc_cpu(&flags);
+		local_irq_enable();
 		break;
 	default:
 		break;

arch/s390/kernel/perf_cpum_sf.c

@@ -1510,7 +1510,6 @@ static void cpumf_measurement_alert(struct ext_code ext_code,
 static int cpumf_pmu_notifier(struct notifier_block *self,
 			      unsigned long action, void *hcpu)
 {
-	unsigned int cpu = (long) hcpu;
 	int flags;
 
 	/* Ignore the notification if no events are scheduled on the PMU.
@@ -1523,11 +1522,15 @@ static int cpumf_pmu_notifier(struct notifier_block *self,
 	case CPU_ONLINE:
 	case CPU_DOWN_FAILED:
 		flags = PMC_INIT;
-		smp_call_function_single(cpu, setup_pmc_cpu, &flags, 1);
+		local_irq_disable();
+		setup_pmc_cpu(&flags);
+		local_irq_enable();
 		break;
 	case CPU_DOWN_PREPARE:
 		flags = PMC_RELEASE;
-		smp_call_function_single(cpu, setup_pmc_cpu, &flags, 1);
+		local_irq_disable();
+		setup_pmc_cpu(&flags);
+		local_irq_enable();
 		break;
 	default:
 		break;

arch/s390/kernel/process.c

@@ -7,6 +7,7 @@
  *		 Denis Joseph Barrow,
  */
 
+#include <linux/elf-randomize.h>
 #include <linux/compiler.h>
 #include <linux/cpu.h>
 #include <linux/sched.h>
@@ -37,9 +38,6 @@
 
 asmlinkage void ret_from_fork(void) asm ("ret_from_fork");
 
-/* FPU save area for the init task */
-__vector128 init_task_fpu_regs[__NUM_VXRS] __init_task_data;
-
 /*
  * Return saved PC of a blocked thread. used in kernel/sched.
  * resume in entry.S does not create a new stack frame, it
@@ -85,35 +83,19 @@ void release_thread(struct task_struct *dead_task)
 
 void arch_release_task_struct(struct task_struct *tsk)
 {
-	/* Free either the floating-point or the vector register save area */
-	kfree(tsk->thread.fpu.regs);
 }
 
 int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
 {
-	size_t fpu_regs_size;
-
-	*dst = *src;
-
-	/*
-	 * If the vector extension is available, it is enabled for all tasks,
-	 * and, thus, the FPU register save area must be allocated accordingly.
-	 */
-	fpu_regs_size = MACHINE_HAS_VX ? sizeof(__vector128) * __NUM_VXRS
-				       : sizeof(freg_t) * __NUM_FPRS;
-	dst->thread.fpu.regs = kzalloc(fpu_regs_size, GFP_KERNEL|__GFP_REPEAT);
-	if (!dst->thread.fpu.regs)
-		return -ENOMEM;
-
 	/*
 	 * Save the floating-point or vector register state of the current
 	 * task and set the CIF_FPU flag to lazy restore the FPU register
 	 * state when returning to user space.
 	 */
 	save_fpu_regs();
-	dst->thread.fpu.fpc = current->thread.fpu.fpc;
-	memcpy(dst->thread.fpu.regs, current->thread.fpu.regs, fpu_regs_size);
 
+	memcpy(dst, src, arch_task_struct_size);
+	dst->thread.fpu.regs = dst->thread.fpu.fprs;
 	return 0;
 }
 

arch/s390/kernel/processor.c

@@ -6,6 +6,7 @@
 #define KMSG_COMPONENT "cpu"
 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
 
+#include <linux/cpufeature.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/seq_file.h>
@@ -84,7 +85,6 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 		seq_puts(m, "\n");
 		show_cacheinfo(m);
 	}
-	get_online_cpus();
 	if (cpu_online(n)) {
 		struct cpuid *id = &per_cpu(cpu_id, n);
 		seq_printf(m, "processor %li: "
@@ -93,23 +93,31 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 			   "machine = %04X\n",
 			   n, id->version, id->ident, id->machine);
 	}
-	put_online_cpus();
 	return 0;
 }
 
+static inline void *c_update(loff_t *pos)
+{
+	if (*pos)
+		*pos = cpumask_next(*pos - 1, cpu_online_mask);
+	return *pos < nr_cpu_ids ? (void *)*pos + 1 : NULL;
+}
+
 static void *c_start(struct seq_file *m, loff_t *pos)
 {
-	return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
+	get_online_cpus();
+	return c_update(pos);
 }
 
 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 {
 	++*pos;
-	return c_start(m, pos);
+	return c_update(pos);
 }
 
 static void c_stop(struct seq_file *m, void *v)
 {
+	put_online_cpus();
 }
 
 const struct seq_operations cpuinfo_op = {

arch/s390/kernel/setup.c

@@ -808,6 +808,22 @@ static void __init setup_randomness(void)
 	free_page((unsigned long) vmms);
 }
 
+/*
+ * Find the correct size for the task_struct. This depends on
+ * the size of the struct fpu at the end of the thread_struct
+ * which is embedded in the task_struct.
+ */
+static void __init setup_task_size(void)
+{
+	int task_size = sizeof(struct task_struct);
+
+	if (!MACHINE_HAS_VX) {
+		task_size -= sizeof(__vector128) * __NUM_VXRS;
+		task_size += sizeof(freg_t) * __NUM_FPRS;
+	}
+	arch_task_struct_size = task_size;
+}
+
 /*
  * Setup function called from init/main.c just after the banner
  * was printed.
@@ -846,6 +862,7 @@ void __init setup_arch(char **cmdline_p)
 
 	os_info_init();
 	setup_ipl();
+	setup_task_size();
 
 	/* Do some memory reservations *before* memory is added to memblock */
 	reserve_memory_end();

arch/s390/kernel/vtime.c

@@ -18,6 +18,8 @@
 #include <asm/cpu_mf.h>
 #include <asm/smp.h>
 
+#include "entry.h"
+
 static void virt_timer_expire(void);
 
 static LIST_HEAD(virt_timer_list);