8 files changed, 285 insertions, 159 deletions

diff --git a/arch/arm/kernel/leds.c b/arch/arm/kernel/leds.c
index 31a316c1777..0f107dcb034 100644
--- a/arch/arm/kernel/leds.c
+++ b/arch/arm/kernel/leds.c
@@ -10,6 +10,7 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/sysdev.h>
+#include <linux/syscore_ops.h>
 
 #include <asm/leds.h>
 
@@ -69,36 +70,37 @@ static ssize_t leds_store(struct sys_device *dev,
 
 static SYSDEV_ATTR(event, 0200, NULL, leds_store);
 
-static int leds_suspend(struct sys_device *dev, pm_message_t state)
+static struct sysdev_class leds_sysclass = {
+	.name		= "leds",
+};
+
+static struct sys_device leds_device = {
+	.id		= 0,
+	.cls		= &leds_sysclass,
+};
+
+static int leds_suspend(void)
 {
 	leds_event(led_stop);
 	return 0;
 }
 
-static int leds_resume(struct sys_device *dev)
+static void leds_resume(void)
 {
 	leds_event(led_start);
-	return 0;
 }
 
-static int leds_shutdown(struct sys_device *dev)
+static void leds_shutdown(void)
 {
 	leds_event(led_halted);
-	return 0;
 }
 
-static struct sysdev_class leds_sysclass = {
-	.name		= "leds",
+static struct syscore_ops leds_syscore_ops = {
 	.shutdown	= leds_shutdown,
 	.suspend	= leds_suspend,
 	.resume		= leds_resume,
 };
 
-static struct sys_device leds_device = {
-	.id		= 0,
-	.cls		= &leds_sysclass,
-};
-
 static int __init leds_init(void)
 {
 	int ret;
@@ -107,6 +109,8 @@ static int __init leds_init(void)
 		ret = sysdev_register(&leds_device);
 	if (ret == 0)
 		ret = sysdev_create_file(&leds_device, &attr_event);
+	if (ret == 0)
+		register_syscore_ops(&leds_syscore_ops);
 	return ret;
 }
 
diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index 139e3c82736..d53c0abc4dd 100644
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -560,11 +560,6 @@ static int armpmu_event_init(struct perf_event *event)
 	event->destroy = hw_perf_event_destroy;
 
 	if (!atomic_inc_not_zero(&active_events)) {
-		if (atomic_read(&active_events) > armpmu->num_events) {
-			atomic_dec(&active_events);
-			return -ENOSPC;
-		}
-
 		mutex_lock(&pmu_reserve_mutex);
 		if (atomic_read(&active_events) == 0) {
 			err = armpmu_reserve_hardware();
diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index 8182f45ca49..97260060bf2 100644
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c
@@ -21,6 +21,7 @@
 #include <linux/uaccess.h>
 #include <linux/perf_event.h>
 #include <linux/hw_breakpoint.h>
+#include <linux/regset.h>
 
 #include <asm/pgtable.h>
 #include <asm/system.h>
@@ -308,58 +309,6 @@ static int ptrace_write_user(struct task_struct *tsk, unsigned long off,
 	return put_user_reg(tsk, off >> 2, val);
 }
 
-/*
- * Get all user integer registers.
- */
-static int ptrace_getregs(struct task_struct *tsk, void __user *uregs)
-{
-	struct pt_regs *regs = task_pt_regs(tsk);
-
-	return copy_to_user(uregs, regs, sizeof(struct pt_regs)) ? -EFAULT : 0;
-}
-
-/*
- * Set all user integer registers.
- */
-static int ptrace_setregs(struct task_struct *tsk, void __user *uregs)
-{
-	struct pt_regs newregs;
-	int ret;
-
-	ret = -EFAULT;
-	if (copy_from_user(&newregs, uregs, sizeof(struct pt_regs)) == 0) {
-		struct pt_regs *regs = task_pt_regs(tsk);
-
-		ret = -EINVAL;
-		if (valid_user_regs(&newregs)) {
-			*regs = newregs;
-			ret = 0;
-		}
-	}
-
-	return ret;
-}
-
-/*
- * Get the child FPU state.
- */
-static int ptrace_getfpregs(struct task_struct *tsk, void __user *ufp)
-{
-	return copy_to_user(ufp, &task_thread_info(tsk)->fpstate,
-			    sizeof(struct user_fp)) ? -EFAULT : 0;
-}
-
-/*
- * Set the child FPU state.
- */
-static int ptrace_setfpregs(struct task_struct *tsk, void __user *ufp)
-{
-	struct thread_info *thread = task_thread_info(tsk);
-	thread->used_cp[1] = thread->used_cp[2] = 1;
-	return copy_from_user(&thread->fpstate, ufp,
-			      sizeof(struct user_fp)) ? -EFAULT : 0;
-}
-
 #ifdef CONFIG_IWMMXT
 
 /*
@@ -418,56 +367,6 @@ static int ptrace_setcrunchregs(struct task_struct *tsk, void __user *ufp)
 }
 #endif
 
-#ifdef CONFIG_VFP
-/*
- * Get the child VFP state.
- */
-static int ptrace_getvfpregs(struct task_struct *tsk, void __user *data)
-{
-	struct thread_info *thread = task_thread_info(tsk);
-	union vfp_state *vfp = &thread->vfpstate;
-	struct user_vfp __user *ufp = data;
-
-	vfp_sync_hwstate(thread);
-
-	/* copy the floating point registers */
-	if (copy_to_user(&ufp->fpregs, &vfp->hard.fpregs,
-			 sizeof(vfp->hard.fpregs)))
-		return -EFAULT;
-
-	/* copy the status and control register */
-	if (put_user(vfp->hard.fpscr, &ufp->fpscr))
-		return -EFAULT;
-
-	return 0;
-}
-
-/*
- * Set the child VFP state.
- */
-static int ptrace_setvfpregs(struct task_struct *tsk, void __user *data)
-{
-	struct thread_info *thread = task_thread_info(tsk);
-	union vfp_state *vfp = &thread->vfpstate;
-	struct user_vfp __user *ufp = data;
-
-	vfp_sync_hwstate(thread);
-
-	/* copy the floating point registers */
-	if (copy_from_user(&vfp->hard.fpregs, &ufp->fpregs,
-			   sizeof(vfp->hard.fpregs)))
-		return -EFAULT;
-
-	/* copy the status and control register */
-	if (get_user(vfp->hard.fpscr, &ufp->fpscr))
-		return -EFAULT;
-
-	vfp_flush_hwstate(thread);
-
-	return 0;
-}
-#endif
-
 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 /*
  * Convert a virtual register number into an index for a thread_info
@@ -694,6 +593,219 @@ out:
 }
 #endif
 
+/* regset get/set implementations */
+
+static int gpr_get(struct task_struct *target,
+		   const struct user_regset *regset,
+		   unsigned int pos, unsigned int count,
+		   void *kbuf, void __user *ubuf)
+{
+	struct pt_regs *regs = task_pt_regs(target);
+
+	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+				   regs,
+				   0, sizeof(*regs));
+}
+
+static int gpr_set(struct task_struct *target,
+		   const struct user_regset *regset,
+		   unsigned int pos, unsigned int count,
+		   const void *kbuf, const void __user *ubuf)
+{
+	int ret;
+	struct pt_regs newregs;
+
+	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+				 &newregs,
+				 0, sizeof(newregs));
+	if (ret)
+		return ret;
+
+	if (!valid_user_regs(&newregs))
+		return -EINVAL;
+
+	*task_pt_regs(target) = newregs;
+	return 0;
+}
+
+static int fpa_get(struct task_struct *target,
+		   const struct user_regset *regset,
+		   unsigned int pos, unsigned int count,
+		   void *kbuf, void __user *ubuf)
+{
+	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+				   &task_thread_info(target)->fpstate,
+				   0, sizeof(struct user_fp));
+}
+
+static int fpa_set(struct task_struct *target,
+		   const struct user_regset *regset,
+		   unsigned int pos, unsigned int count,
+		   const void *kbuf, const void __user *ubuf)
+{
+	struct thread_info *thread = task_thread_info(target);
+
+	thread->used_cp[1] = thread->used_cp[2] = 1;
+
+	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+		&thread->fpstate,
+		0, sizeof(struct user_fp));
+}
+
+#ifdef CONFIG_VFP
+/*
+ * VFP register get/set implementations.
+ *
+ * With respect to the kernel, struct user_fp is divided into three chunks:
+ * 16 or 32 real VFP registers (d0-d15 or d0-31)
+ *	These are transferred to/from the real registers in the task's
+ *	vfp_hard_struct.  The number of registers depends on the kernel
+ *	configuration.
+ *
+ * 16 or 0 fake VFP registers (d16-d31 or empty)
+ *	i.e., the user_vfp structure has space for 32 registers even if
+ *	the kernel doesn't have them all.
+ *
+ *	vfp_get() reads this chunk as zero where applicable
+ *	vfp_set() ignores this chunk
+ *
+ * 1 word for the FPSCR
+ *
+ * The bounds-checking logic built into user_regset_copyout and friends
+ * means that we can make a simple sequence of calls to map the relevant data
+ * to/from the specified slice of the user regset structure.
+ */
+static int vfp_get(struct task_struct *target,
+		   const struct user_regset *regset,
+		   unsigned int pos, unsigned int count,
+		   void *kbuf, void __user *ubuf)
+{
+	int ret;
+	struct thread_info *thread = task_thread_info(target);
+	struct vfp_hard_struct const *vfp = &thread->vfpstate.hard;
+	const size_t user_fpregs_offset = offsetof(struct user_vfp, fpregs);
+	const size_t user_fpscr_offset = offsetof(struct user_vfp, fpscr);
+
+	vfp_sync_hwstate(thread);
+
+	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+				  &vfp->fpregs,
+				  user_fpregs_offset,
+				  user_fpregs_offset + sizeof(vfp->fpregs));
+	if (ret)
+		return ret;
+
+	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
+				       user_fpregs_offset + sizeof(vfp->fpregs),
+				       user_fpscr_offset);
+	if (ret)
+		return ret;
+
+	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+				   &vfp->fpscr,
+				   user_fpscr_offset,
+				   user_fpscr_offset + sizeof(vfp->fpscr));
+}
+
+/*
+ * For vfp_set() a read-modify-write is done on the VFP registers,
+ * in order to avoid writing back a half-modified set of registers on
+ * failure.
+ */
+static int vfp_set(struct task_struct *target,
+			  const struct user_regset *regset,
+			  unsigned int pos, unsigned int count,
+			  const void *kbuf, const void __user *ubuf)
+{
+	int ret;
+	struct thread_info *thread = task_thread_info(target);
+	struct vfp_hard_struct new_vfp = thread->vfpstate.hard;
+	const size_t user_fpregs_offset = offsetof(struct user_vfp, fpregs);
+	const size_t user_fpscr_offset = offsetof(struct user_vfp, fpscr);
+
+	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+				  &new_vfp.fpregs,
+				  user_fpregs_offset,
+				  user_fpregs_offset + sizeof(new_vfp.fpregs));
+	if (ret)
+		return ret;
+
+	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+				user_fpregs_offset + sizeof(new_vfp.fpregs),
+				user_fpscr_offset);
+	if (ret)
+		return ret;
+
+	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+				 &new_vfp.fpscr,
+				 user_fpscr_offset,
+				 user_fpscr_offset + sizeof(new_vfp.fpscr));
+	if (ret)
+		return ret;
+
+	vfp_sync_hwstate(thread);
+	thread->vfpstate.hard = new_vfp;
+	vfp_flush_hwstate(thread);
+
+	return 0;
+}
+#endif /* CONFIG_VFP */
+
+enum arm_regset {
+	REGSET_GPR,
+	REGSET_FPR,
+#ifdef CONFIG_VFP
+	REGSET_VFP,
+#endif
+};
+
+static const struct user_regset arm_regsets[] = {
+	[REGSET_GPR] = {
+		.core_note_type = NT_PRSTATUS,
+		.n = ELF_NGREG,
+		.size = sizeof(u32),
+		.align = sizeof(u32),
+		.get = gpr_get,
+		.set = gpr_set
+	},
+	[REGSET_FPR] = {
+		/*
+		 * For the FPA regs in fpstate, the real fields are a mixture
+		 * of sizes, so pretend that the registers are word-sized:
+		 */
+		.core_note_type = NT_PRFPREG,
+		.n = sizeof(struct user_fp) / sizeof(u32),
+		.size = sizeof(u32),
+		.align = sizeof(u32),
+		.get = fpa_get,
+		.set = fpa_set
+	},
+#ifdef CONFIG_VFP
+	[REGSET_VFP] = {
+		/*
+		 * Pretend that the VFP regs are word-sized, since the FPSCR is
+		 * a single word dangling at the end of struct user_vfp:
+		 */
+		.core_note_type = NT_ARM_VFP,
+		.n = ARM_VFPREGS_SIZE / sizeof(u32),
+		.size = sizeof(u32),
+		.align = sizeof(u32),
+		.get = vfp_get,
+		.set = vfp_set
+	},
+#endif /* CONFIG_VFP */
+};
+
+static const struct user_regset_view user_arm_view = {
+	.name = "arm", .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI,
+	.regsets = arm_regsets, .n = ARRAY_SIZE(arm_regsets)
+};
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+	return &user_arm_view;
+}
+
 long arch_ptrace(struct task_struct *child, long request,
 		 unsigned long addr, unsigned long data)
 {
@@ -710,19 +822,31 @@ long arch_ptrace(struct task_struct *child, long request,
 			break;
 
 		case PTRACE_GETREGS:
-			ret = ptrace_getregs(child, datap);
+			ret = copy_regset_to_user(child,
+						  &user_arm_view, REGSET_GPR,
+						  0, sizeof(struct pt_regs),
+						  datap);
 			break;
 
 		case PTRACE_SETREGS:
-			ret = ptrace_setregs(child, datap);
+			ret = copy_regset_from_user(child,
+						    &user_arm_view, REGSET_GPR,
+						    0, sizeof(struct pt_regs),
+						    datap);
 			break;
 
 		case PTRACE_GETFPREGS:
-			ret = ptrace_getfpregs(child, datap);
+			ret = copy_regset_to_user(child,
+						  &user_arm_view, REGSET_FPR,
+						  0, sizeof(union fp_state),
+						  datap);
 			break;
-		
+
 		case PTRACE_SETFPREGS:
-			ret = ptrace_setfpregs(child, datap);
+			ret = copy_regset_from_user(child,
+						    &user_arm_view, REGSET_FPR,
+						    0, sizeof(union fp_state),
+						    datap);
 			break;
 
 #ifdef CONFIG_IWMMXT
@@ -757,11 +881,17 @@ long arch_ptrace(struct task_struct *child, long request,
 
 #ifdef CONFIG_VFP
 		case PTRACE_GETVFPREGS:
-			ret = ptrace_getvfpregs(child, datap);
+			ret = copy_regset_to_user(child,
+						  &user_arm_view, REGSET_VFP,
+						  0, ARM_VFPREGS_SIZE,
+						  datap);
 			break;
 
 		case PTRACE_SETVFPREGS:
-			ret = ptrace_setvfpregs(child, datap);
+			ret = copy_regset_from_user(child,
+						    &user_arm_view, REGSET_VFP,
+						    0, ARM_VFPREGS_SIZE,
+						    datap);
 			break;
 #endif
 
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 006c1e884ea..6dce209a623 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -672,11 +672,16 @@ __tagtable(ATAG_REVISION, parse_tag_revision);
 
 static int __init parse_tag_cmdline(const struct tag *tag)
 {
-#ifndef CONFIG_CMDLINE_FORCE
-	strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
-#else
+#if defined(CONFIG_CMDLINE_EXTEND)
+	strlcat(default_command_line, " ", COMMAND_LINE_SIZE);
+	strlcat(default_command_line, tag->u.cmdline.cmdline,
+		COMMAND_LINE_SIZE);
+#elif defined(CONFIG_CMDLINE_FORCE)
 	pr_warning("Ignoring tag cmdline (using the default kernel command line)\n");
-#endif /* CONFIG_CMDLINE_FORCE */
+#else
+	strlcpy(default_command_line, tag->u.cmdline.cmdline,
+		COMMAND_LINE_SIZE);
+#endif
 	return 0;
 }
 
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index f29b8a29b17..d439a8f4c07 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -376,6 +376,13 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
 	}
 }
 
+static void (*smp_cross_call)(const struct cpumask *, unsigned int);
+
+void __init set_smp_cross_call(void (*fn)(const struct cpumask *, unsigned int))
+{
+	smp_cross_call = fn;
+}
+
 void arch_send_call_function_ipi_mask(const struct cpumask *mask)
 {
 	smp_cross_call(mask, IPI_CALL_FUNC);
@@ -560,10 +567,7 @@ asmlinkage void __exception_irq_entry do_IPI(int ipinr, struct pt_regs *regs)
 		break;
 
 	case IPI_RESCHEDULE:
-		/*
-		 * nothing more to do - eveything is
-		 * done on the interrupt return path
-		 */
+		scheduler_ipi();
 		break;
 
 	case IPI_CALL_FUNC:
diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index 1ff46cabc7e..cb634c3e28e 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -21,7 +21,7 @@
 #include <linux/timex.h>
 #include <linux/errno.h>
 #include <linux/profile.h>
-#include <linux/sysdev.h>
+#include <linux/syscore_ops.h>
 #include <linux/timer.h>
 #include <linux/irq.h>
 
@@ -115,48 +115,37 @@ void timer_tick(void)
 #endif
 
 #if defined(CONFIG_PM) && !defined(CONFIG_GENERIC_CLOCKEVENTS)
-static int timer_suspend(struct sys_device *dev, pm_message_t state)
+static int timer_suspend(void)
 {
-	struct sys_timer *timer = container_of(dev, struct sys_timer, dev);
-
-	if (timer->suspend != NULL)
-		timer->suspend();
+	if (system_timer->suspend)
+		system_timer->suspend();
 
 	return 0;
 }
 
-static int timer_resume(struct sys_device *dev)
+static void timer_resume(void)
 {
-	struct sys_timer *timer = container_of(dev, struct sys_timer, dev);
-
-	if (timer->resume != NULL)
-		timer->resume();
-
-	return 0;
+	if (system_timer->resume)
+		system_timer->resume();
 }
 #else
 #define timer_suspend NULL
 #define timer_resume NULL
 #endif
 
-static struct sysdev_class timer_sysclass = {
-	.name		= "timer",
+static struct syscore_ops timer_syscore_ops = {
 	.suspend	= timer_suspend,
 	.resume		= timer_resume,
 };
 
-static int __init timer_init_sysfs(void)
+static int __init timer_init_syscore_ops(void)
 {
-	int ret = sysdev_class_register(&timer_sysclass);
-	if (ret == 0) {
-		system_timer->dev.cls = &timer_sysclass;
-		ret = sysdev_register(&system_timer->dev);
-	}
+	register_syscore_ops(&timer_syscore_ops);
 
-	return ret;
+	return 0;
 }
 
-device_initcall(timer_init_sysfs);
+device_initcall(timer_init_syscore_ops);
 
 void __init time_init(void)
 {
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 3b54ad19d48..d52eec268b4 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -234,7 +234,6 @@ static int __die(const char *str, int err, struct thread_info *thread, struct pt
 
 	printk(KERN_EMERG "Internal error: %s: %x [#%d]" S_PREEMPT S_SMP "\n",
 	       str, err, ++die_counter);
-	sysfs_printk_last_file();
 
 	/* trap and error numbers are mostly meaningless on ARM */
 	ret = notify_die(DIE_OOPS, str, regs, err, tsk->thread.trap_no, SIGSEGV);
diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index b4348e62ef0..e5287f21bad 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -82,7 +82,7 @@ SECTIONS
 #endif
 	}
 
-	PERCPU(32, PAGE_SIZE)
+	PERCPU_SECTION(32)
 
 #ifndef CONFIG_XIP_KERNEL
 	. = ALIGN(PAGE_SIZE);