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

…/git/s390/linux

Pull s390 patches from Martin Schwidefsky:
 "Add the finit_module system call, fix the irq statistics in
  /proc/stat, fix a s390dbf lockdep problem, a patch revert for a
  problem that is not 100% understood yet, and a few patches to
  fix warnings."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/pci: define read*_relaxed functions
  s390/topology: export cpu_topology
  s390/pm: export pm_power_off
  s390/pci: define isa_dma_bridge_buggy
  s390/3215: partially revert tty close handling fix
  s390/irq: count cpu restart events
  s390/irq: remove split irq fields from /proc/stat
  s390/irq: enable irq sum accounting for /proc/stat again
  s390/syscalls: wire up finit_module syscall
  s390/pci: remove dead code
  s390/smp: fix section mismatch for smp_add_present_cpu()
  s390/debug: Fix s390dbf lockdep problem in debug_(un)register_view()

arch/s390/include/asm/dma.h

@@ -10,4 +10,10 @@
  */
 #define MAX_DMA_ADDRESS         0x80000000
 
+#ifdef CONFIG_PCI
+extern int isa_dma_bridge_buggy;
+#else
+#define isa_dma_bridge_buggy	(0)
+#endif
+
 #endif /* _ASM_S390_DMA_H */

arch/s390/include/asm/io.h

@@ -85,6 +85,11 @@ static inline void iounmap(volatile void __iomem *addr)
 #define __raw_writel	zpci_write_u32
 #define __raw_writeq	zpci_write_u64
 
+#define readb_relaxed	readb
+#define readw_relaxed	readw
+#define readl_relaxed	readl
+#define readq_relaxed	readq
+
 #endif /* CONFIG_PCI */
 
 #include <asm-generic/io.h>

arch/s390/include/asm/irq.h

@@ -2,43 +2,61 @@
 #define _ASM_IRQ_H
 
 #include <linux/hardirq.h>
+#include <linux/percpu.h>
+#include <linux/cache.h>
 #include <linux/types.h>
 
-enum interruption_class {
+enum interruption_main_class {
 	EXTERNAL_INTERRUPT,
 	IO_INTERRUPT,
-	EXTINT_CLK,
-	EXTINT_EXC,
-	EXTINT_EMS,
-	EXTINT_TMR,
-	EXTINT_TLA,
-	EXTINT_PFL,
-	EXTINT_DSD,
-	EXTINT_VRT,
-	EXTINT_SCP,
-	EXTINT_IUC,
-	EXTINT_CMS,
-	EXTINT_CMC,
-	EXTINT_CMR,
-	IOINT_CIO,
-	IOINT_QAI,
-	IOINT_DAS,
-	IOINT_C15,
-	IOINT_C70,
-	IOINT_TAP,
-	IOINT_VMR,
-	IOINT_LCS,
-	IOINT_CLW,
-	IOINT_CTC,
-	IOINT_APB,
-	IOINT_ADM,
-	IOINT_CSC,
-	IOINT_PCI,
-	IOINT_MSI,
+	NR_IRQS
+};
+
+enum interruption_class {
+	IRQEXT_CLK,
+	IRQEXT_EXC,
+	IRQEXT_EMS,
+	IRQEXT_TMR,
+	IRQEXT_TLA,
+	IRQEXT_PFL,
+	IRQEXT_DSD,
+	IRQEXT_VRT,
+	IRQEXT_SCP,
+	IRQEXT_IUC,
+	IRQEXT_CMS,
+	IRQEXT_CMC,
+	IRQEXT_CMR,
+	IRQIO_CIO,
+	IRQIO_QAI,
+	IRQIO_DAS,
+	IRQIO_C15,
+	IRQIO_C70,
+	IRQIO_TAP,
+	IRQIO_VMR,
+	IRQIO_LCS,
+	IRQIO_CLW,
+	IRQIO_CTC,
+	IRQIO_APB,
+	IRQIO_ADM,
+	IRQIO_CSC,
+	IRQIO_PCI,
+	IRQIO_MSI,
 	NMI_NMI,
-	NR_IRQS,
+	CPU_RST,
+	NR_ARCH_IRQS
 };
 
+struct irq_stat {
+	unsigned int irqs[NR_ARCH_IRQS];
+};
+
+DECLARE_PER_CPU_SHARED_ALIGNED(struct irq_stat, irq_stat);
+
+static __always_inline void inc_irq_stat(enum interruption_class irq)
+{
+	__get_cpu_var(irq_stat).irqs[irq]++;
+}
+
 struct ext_code {
 	unsigned short subcode;
 	unsigned short code;

arch/s390/include/uapi/asm/unistd.h

@@ -279,7 +279,8 @@
 #define __NR_process_vm_writev	341
 #define __NR_s390_runtime_instr 342
 #define __NR_kcmp		343
-#define NR_syscalls 344
+#define __NR_finit_module	344
+#define NR_syscalls 345
 
 /* 
  * There are some system calls that are not present on 64 bit, some

arch/s390/kernel/compat_wrapper.S

@@ -1659,3 +1659,9 @@ ENTRY(sys_kcmp_wrapper)
 	llgfr	%r5,%r5			# unsigned long
 	llgfr	%r6,%r6			# unsigned long
 	jg	sys_kcmp
+
+ENTRY(sys_finit_module_wrapper)
+	lgfr	%r2,%r2			# int
+	llgtr	%r3,%r3			# const char __user *
+	lgfr	%r4,%r4			# int
+	jg	sys_finit_module

arch/s390/kernel/debug.c

@@ -1127,13 +1127,14 @@ debug_register_view(debug_info_t * id, struct debug_view *view)
 	if (i == DEBUG_MAX_VIEWS) {
 		pr_err("Registering view %s/%s would exceed the maximum "
 		       "number of views %i\n", id->name, view->name, i);
-		debugfs_remove(pde);
 		rc = -1;
 	} else {
 		id->views[i] = view;
 		id->debugfs_entries[i] = pde;
 	}
 	spin_unlock_irqrestore(&id->lock, flags);
+	if (rc)
+		debugfs_remove(pde);
 out:
 	return rc;
 }
@@ -1146,9 +1147,9 @@ EXPORT_SYMBOL(debug_register_view);
 int
 debug_unregister_view(debug_info_t * id, struct debug_view *view)
 {
-	int rc = 0;
-	int i;
+	struct dentry *dentry = NULL;
 	unsigned long flags;
+	int i, rc = 0;
 
 	if (!id)
 		goto out;
@@ -1160,10 +1161,12 @@ debug_unregister_view(debug_info_t * id, struct debug_view *view)
 	if (i == DEBUG_MAX_VIEWS)
 		rc = -1;
 	else {
-		debugfs_remove(id->debugfs_entries[i]);
+		dentry = id->debugfs_entries[i];
 		id->views[i] = NULL;
+		id->debugfs_entries[i] = NULL;
 	}
 	spin_unlock_irqrestore(&id->lock, flags);
+	debugfs_remove(dentry);
 out:
 	return rc;
 }

arch/s390/kernel/irq.c

@@ -24,74 +24,100 @@
 #include <asm/irq.h>
 #include "entry.h"
 
+DEFINE_PER_CPU_SHARED_ALIGNED(struct irq_stat, irq_stat);
+EXPORT_PER_CPU_SYMBOL_GPL(irq_stat);
+
 struct irq_class {
 	char *name;
 	char *desc;
 };
 
-static const struct irq_class intrclass_names[] = {
+/*
+ * The list of "main" irq classes on s390. This is the list of interrrupts
+ * that appear both in /proc/stat ("intr" line) and /proc/interrupts.
+ * Historically only external and I/O interrupts have been part of /proc/stat.
+ * We can't add the split external and I/O sub classes since the first field
+ * in the "intr" line in /proc/stat is supposed to be the sum of all other
+ * fields.
+ * Since the external and I/O interrupt fields are already sums we would end
+ * up with having a sum which accounts each interrupt twice.
+ */
+static const struct irq_class irqclass_main_desc[NR_IRQS] = {
 	[EXTERNAL_INTERRUPT] = {.name = "EXT"},
-	[IO_INTERRUPT]	     = {.name = "I/O"},
-	[EXTINT_CLK] = {.name = "CLK", .desc = "[EXT] Clock Comparator"},
-	[EXTINT_EXC] = {.name = "EXC", .desc = "[EXT] External Call"},
-	[EXTINT_EMS] = {.name = "EMS", .desc = "[EXT] Emergency Signal"},
-	[EXTINT_TMR] = {.name = "TMR", .desc = "[EXT] CPU Timer"},
-	[EXTINT_TLA] = {.name = "TAL", .desc = "[EXT] Timing Alert"},
-	[EXTINT_PFL] = {.name = "PFL", .desc = "[EXT] Pseudo Page Fault"},
-	[EXTINT_DSD] = {.name = "DSD", .desc = "[EXT] DASD Diag"},
-	[EXTINT_VRT] = {.name = "VRT", .desc = "[EXT] Virtio"},
-	[EXTINT_SCP] = {.name = "SCP", .desc = "[EXT] Service Call"},
-	[EXTINT_IUC] = {.name = "IUC", .desc = "[EXT] IUCV"},
-	[EXTINT_CMS] = {.name = "CMS", .desc = "[EXT] CPU-Measurement: Sampling"},
-	[EXTINT_CMC] = {.name = "CMC", .desc = "[EXT] CPU-Measurement: Counter"},
-	[EXTINT_CMR] = {.name = "CMR", .desc = "[EXT] CPU-Measurement: RI"},
-	[IOINT_CIO]  = {.name = "CIO", .desc = "[I/O] Common I/O Layer Interrupt"},
-	[IOINT_QAI]  = {.name = "QAI", .desc = "[I/O] QDIO Adapter Interrupt"},
-	[IOINT_DAS]  = {.name = "DAS", .desc = "[I/O] DASD"},
-	[IOINT_C15]  = {.name = "C15", .desc = "[I/O] 3215"},
-	[IOINT_C70]  = {.name = "C70", .desc = "[I/O] 3270"},
-	[IOINT_TAP]  = {.name = "TAP", .desc = "[I/O] Tape"},
-	[IOINT_VMR]  = {.name = "VMR", .desc = "[I/O] Unit Record Devices"},
-	[IOINT_LCS]  = {.name = "LCS", .desc = "[I/O] LCS"},
-	[IOINT_CLW]  = {.name = "CLW", .desc = "[I/O] CLAW"},
-	[IOINT_CTC]  = {.name = "CTC", .desc = "[I/O] CTC"},
-	[IOINT_APB]  = {.name = "APB", .desc = "[I/O] AP Bus"},
-	[IOINT_ADM]  = {.name = "ADM", .desc = "[I/O] EADM Subchannel"},
-	[IOINT_CSC]  = {.name = "CSC", .desc = "[I/O] CHSC Subchannel"},
-	[IOINT_PCI]  = {.name = "PCI", .desc = "[I/O] PCI Interrupt" },
-	[IOINT_MSI] =  {.name = "MSI", .desc = "[I/O] MSI Interrupt" },
+	[IO_INTERRUPT]	     = {.name = "I/O"}
+};
+
+/*
+ * The list of split external and I/O interrupts that appear only in
+ * /proc/interrupts.
+ * In addition this list contains non external / I/O events like NMIs.
+ */
+static const struct irq_class irqclass_sub_desc[NR_ARCH_IRQS] = {
+	[IRQEXT_CLK] = {.name = "CLK", .desc = "[EXT] Clock Comparator"},
+	[IRQEXT_EXC] = {.name = "EXC", .desc = "[EXT] External Call"},
+	[IRQEXT_EMS] = {.name = "EMS", .desc = "[EXT] Emergency Signal"},
+	[IRQEXT_TMR] = {.name = "TMR", .desc = "[EXT] CPU Timer"},
+	[IRQEXT_TLA] = {.name = "TAL", .desc = "[EXT] Timing Alert"},
+	[IRQEXT_PFL] = {.name = "PFL", .desc = "[EXT] Pseudo Page Fault"},
+	[IRQEXT_DSD] = {.name = "DSD", .desc = "[EXT] DASD Diag"},
+	[IRQEXT_VRT] = {.name = "VRT", .desc = "[EXT] Virtio"},
+	[IRQEXT_SCP] = {.name = "SCP", .desc = "[EXT] Service Call"},
+	[IRQEXT_IUC] = {.name = "IUC", .desc = "[EXT] IUCV"},
+	[IRQEXT_CMS] = {.name = "CMS", .desc = "[EXT] CPU-Measurement: Sampling"},
+	[IRQEXT_CMC] = {.name = "CMC", .desc = "[EXT] CPU-Measurement: Counter"},
+	[IRQEXT_CMR] = {.name = "CMR", .desc = "[EXT] CPU-Measurement: RI"},
+	[IRQIO_CIO]  = {.name = "CIO", .desc = "[I/O] Common I/O Layer Interrupt"},
+	[IRQIO_QAI]  = {.name = "QAI", .desc = "[I/O] QDIO Adapter Interrupt"},
+	[IRQIO_DAS]  = {.name = "DAS", .desc = "[I/O] DASD"},
+	[IRQIO_C15]  = {.name = "C15", .desc = "[I/O] 3215"},
+	[IRQIO_C70]  = {.name = "C70", .desc = "[I/O] 3270"},
+	[IRQIO_TAP]  = {.name = "TAP", .desc = "[I/O] Tape"},
+	[IRQIO_VMR]  = {.name = "VMR", .desc = "[I/O] Unit Record Devices"},
+	[IRQIO_LCS]  = {.name = "LCS", .desc = "[I/O] LCS"},
+	[IRQIO_CLW]  = {.name = "CLW", .desc = "[I/O] CLAW"},
+	[IRQIO_CTC]  = {.name = "CTC", .desc = "[I/O] CTC"},
+	[IRQIO_APB]  = {.name = "APB", .desc = "[I/O] AP Bus"},
+	[IRQIO_ADM]  = {.name = "ADM", .desc = "[I/O] EADM Subchannel"},
+	[IRQIO_CSC]  = {.name = "CSC", .desc = "[I/O] CHSC Subchannel"},
+	[IRQIO_PCI]  = {.name = "PCI", .desc = "[I/O] PCI Interrupt" },
+	[IRQIO_MSI]  = {.name = "MSI", .desc = "[I/O] MSI Interrupt" },
 	[NMI_NMI]    = {.name = "NMI", .desc = "[NMI] Machine Check"},
+	[CPU_RST]    = {.name = "RST", .desc = "[CPU] CPU Restart"},
 };
 
 /*
  * show_interrupts is needed by /proc/interrupts.
  */
 int show_interrupts(struct seq_file *p, void *v)
 {
-	int i = *(loff_t *) v, j;
+	int irq = *(loff_t *) v;
+	int cpu;
 
 	get_online_cpus();
-	if (i == 0) {
+	if (irq == 0) {
 		seq_puts(p, "           ");
-		for_each_online_cpu(j)
-			seq_printf(p, "CPU%d       ",j);
+		for_each_online_cpu(cpu)
+			seq_printf(p, "CPU%d       ", cpu);
 		seq_putc(p, '\n');
 	}
-
-	if (i < NR_IRQS) {
-		seq_printf(p, "%s: ", intrclass_names[i].name);
-#ifndef CONFIG_SMP
-		seq_printf(p, "%10u ", kstat_irqs(i));
-#else
-		for_each_online_cpu(j)
-			seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
-#endif
-		if (intrclass_names[i].desc)
-			seq_printf(p, "  %s", intrclass_names[i].desc);
-                seq_putc(p, '\n');
-        }
+	if (irq < NR_IRQS) {
+		seq_printf(p, "%s: ", irqclass_main_desc[irq].name);
+		for_each_online_cpu(cpu)
+			seq_printf(p, "%10u ", kstat_cpu(cpu).irqs[irq]);
+		seq_putc(p, '\n');
+		goto skip_arch_irqs;
+	}
+	for (irq = 0; irq < NR_ARCH_IRQS; irq++) {
+		seq_printf(p, "%s: ", irqclass_sub_desc[irq].name);
+		for_each_online_cpu(cpu)
+			seq_printf(p, "%10u ", per_cpu(irq_stat, cpu).irqs[irq]);
+		if (irqclass_sub_desc[irq].desc)
+			seq_printf(p, "  %s", irqclass_sub_desc[irq].desc);
+		seq_putc(p, '\n');
+	}
+skip_arch_irqs:
 	put_online_cpus();
-        return 0;
+	return 0;
 }
 
 /*
@@ -222,7 +248,7 @@ void __irq_entry do_extint(struct pt_regs *regs, struct ext_code ext_code,
 		/* Serve timer interrupts first. */
 		clock_comparator_work();
 	}
-	kstat_cpu(smp_processor_id()).irqs[EXTERNAL_INTERRUPT]++;
+	kstat_incr_irqs_this_cpu(EXTERNAL_INTERRUPT, NULL);
 	if (ext_code.code != 0x1004)
 		__get_cpu_var(s390_idle).nohz_delay = 1;
 

arch/s390/kernel/nmi.c

@@ -254,7 +254,7 @@ void notrace s390_do_machine_check(struct pt_regs *regs)
 	int umode;
 
 	nmi_enter();
-	kstat_cpu(smp_processor_id()).irqs[NMI_NMI]++;
+	inc_irq_stat(NMI_NMI);
 	mci = (struct mci *) &S390_lowcore.mcck_interruption_code;
 	mcck = &__get_cpu_var(cpu_mcck);
 	umode = user_mode(regs);

arch/s390/kernel/perf_cpum_cf.c

@@ -229,7 +229,7 @@ static void cpumf_measurement_alert(struct ext_code ext_code,
 	if (!(alert & CPU_MF_INT_CF_MASK))
 		return;
 
-	kstat_cpu(smp_processor_id()).irqs[EXTINT_CMC]++;
+	inc_irq_stat(IRQEXT_CMC);
 	cpuhw = &__get_cpu_var(cpu_hw_events);
 
 	/* Measurement alerts are shared and might happen when the PMU

arch/s390/kernel/runtime_instr.c

@@ -71,7 +71,7 @@ static void runtime_instr_int_handler(struct ext_code ext_code,
 	if (!(param32 & CPU_MF_INT_RI_MASK))
 		return;
 
-	kstat_cpu(smp_processor_id()).irqs[EXTINT_CMR]++;
+	inc_irq_stat(IRQEXT_CMR);
 
 	if (!current->thread.ri_cb)
 		return;

arch/s390/kernel/setup.c

@@ -16,7 +16,7 @@
 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
 
 #include <linux/errno.h>
-#include <linux/module.h>
+#include <linux/export.h>
 #include <linux/sched.h>
 #include <linux/kernel.h>
 #include <linux/memblock.h>
@@ -289,6 +289,7 @@ void machine_power_off(void)
  * Dummy power off function.
  */
 void (*pm_power_off)(void) = machine_power_off;
+EXPORT_SYMBOL_GPL(pm_power_off);
 
 static int __init early_parse_mem(char *p)
 {