Merge branch 'perf/core' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing into perf/core

10 files changed, 15 insertions, 541 deletions

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 8317ec4b9f3b..adee958b5989 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -508,9 +508,6 @@ extern void tracing_start(void);
 extern void tracing_stop(void);
 extern void ftrace_off_permanent(void);
 
-extern void
-ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3);
-
 static inline void __attribute__ ((format (printf, 1, 2)))
 ____trace_printk_check_format(const char *fmt, ...)
 {
@@ -586,8 +583,6 @@ __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap);
 
 extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode);
 #else
-static inline void
-ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { }
 static inline int
 trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
 
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 747fcaedddb7..f751ea9dcb7b 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2434,18 +2434,6 @@ static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
 
 #endif /* CONFIG_SMP */
 
-#ifdef CONFIG_TRACING
-extern void
-__trace_special(void *__tr, void *__data,
-		unsigned long arg1, unsigned long arg2, unsigned long arg3);
-#else
-static inline void
-__trace_special(void *__tr, void *__data,
-		unsigned long arg1, unsigned long arg2, unsigned long arg3)
-{
-}
-#endif
-
 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
 extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
 
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index f5306cb0afb1..c7683fd8a03a 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -194,15 +194,6 @@ config PREEMPT_TRACER
 	  enabled. This option and the irqs-off timing option can be
 	  used together or separately.)
 
-config SYSPROF_TRACER
-	bool "Sysprof Tracer"
-	depends on X86
-	select GENERIC_TRACER
-	select CONTEXT_SWITCH_TRACER
-	help
-	  This tracer provides the trace needed by the 'Sysprof' userspace
-	  tool.
-
 config SCHED_TRACER
 	bool "Scheduling Latency Tracer"
 	select GENERIC_TRACER
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index 84b2c9908dae..438e84a56ab3 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -30,7 +30,6 @@ obj-$(CONFIG_TRACING) += trace_output.o
 obj-$(CONFIG_TRACING) += trace_stat.o
 obj-$(CONFIG_TRACING) += trace_printk.o
 obj-$(CONFIG_CONTEXT_SWITCH_TRACER) += trace_sched_switch.o
-obj-$(CONFIG_SYSPROF_TRACER) += trace_sysprof.o
 obj-$(CONFIG_FUNCTION_TRACER) += trace_functions.o
 obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o
 obj-$(CONFIG_PREEMPT_TRACER) += trace_irqsoff.o
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 8683dec6946b..c1752dac613e 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1331,61 +1331,6 @@ static void __trace_userstack(struct trace_array *tr, unsigned long flags)
 
 #endif /* CONFIG_STACKTRACE */
 
-static void
-ftrace_trace_special(void *__tr,
-		     unsigned long arg1, unsigned long arg2, unsigned long arg3,
-		     int pc)
-{
-	struct ftrace_event_call *call = &event_special;
-	struct ring_buffer_event *event;
-	struct trace_array *tr = __tr;
-	struct ring_buffer *buffer = tr->buffer;
-	struct special_entry *entry;
-
-	event = trace_buffer_lock_reserve(buffer, TRACE_SPECIAL,
-					  sizeof(*entry), 0, pc);
-	if (!event)
-		return;
-	entry	= ring_buffer_event_data(event);
-	entry->arg1			= arg1;
-	entry->arg2			= arg2;
-	entry->arg3			= arg3;
-
-	if (!filter_check_discard(call, entry, buffer, event))
-		trace_buffer_unlock_commit(buffer, event, 0, pc);
-}
-
-void
-__trace_special(void *__tr, void *__data,
-		unsigned long arg1, unsigned long arg2, unsigned long arg3)
-{
-	ftrace_trace_special(__tr, arg1, arg2, arg3, preempt_count());
-}
-
-void
-ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3)
-{
-	struct trace_array *tr = &global_trace;
-	struct trace_array_cpu *data;
-	unsigned long flags;
-	int cpu;
-	int pc;
-
-	if (tracing_disabled)
-		return;
-
-	pc = preempt_count();
-	local_irq_save(flags);
-	cpu = raw_smp_processor_id();
-	data = tr->data[cpu];
-
-	if (likely(atomic_inc_return(&data->disabled) == 1))
-		ftrace_trace_special(tr, arg1, arg2, arg3, pc);
-
-	atomic_dec(&data->disabled);
-	local_irq_restore(flags);
-}
-
 /**
  * trace_vbprintk - write binary msg to tracing buffer
  *
@@ -2393,6 +2338,7 @@ static const struct file_operations show_traces_fops = {
 	.open		= show_traces_open,
 	.read		= seq_read,
 	.release	= seq_release,
+	.llseek		= seq_lseek,
 };
 
 /*
@@ -2486,6 +2432,7 @@ static const struct file_operations tracing_cpumask_fops = {
 	.open		= tracing_open_generic,
 	.read		= tracing_cpumask_read,
 	.write		= tracing_cpumask_write,
+	.llseek		= generic_file_llseek,
 };
 
 static int tracing_trace_options_show(struct seq_file *m, void *v)
@@ -2652,6 +2599,7 @@ tracing_readme_read(struct file *filp, char __user *ubuf,
 static const struct file_operations tracing_readme_fops = {
 	.open		= tracing_open_generic,
 	.read		= tracing_readme_read,
+	.llseek		= generic_file_llseek,
 };
 
 static ssize_t
@@ -2702,6 +2650,7 @@ tracing_saved_cmdlines_read(struct file *file, char __user *ubuf,
 static const struct file_operations tracing_saved_cmdlines_fops = {
     .open       = tracing_open_generic,
     .read       = tracing_saved_cmdlines_read,
+    .llseek	= generic_file_llseek,
 };
 
 static ssize_t
@@ -3031,6 +2980,7 @@ static int tracing_open_pipe(struct inode *inode, struct file *filp)
 	if (iter->trace->pipe_open)
 		iter->trace->pipe_open(iter);
 
+	nonseekable_open(inode, filp);
 out:
 	mutex_unlock(&trace_types_lock);
 	return ret;
@@ -3589,18 +3539,21 @@ static const struct file_operations tracing_max_lat_fops = {
 	.open		= tracing_open_generic,
 	.read		= tracing_max_lat_read,
 	.write		= tracing_max_lat_write,
+	.llseek		= generic_file_llseek,
 };
 
 static const struct file_operations tracing_ctrl_fops = {
 	.open		= tracing_open_generic,
 	.read		= tracing_ctrl_read,
 	.write		= tracing_ctrl_write,
+	.llseek		= generic_file_llseek,
 };
 
 static const struct file_operations set_tracer_fops = {
 	.open		= tracing_open_generic,
 	.read		= tracing_set_trace_read,
 	.write		= tracing_set_trace_write,
+	.llseek		= generic_file_llseek,
 };
 
 static const struct file_operations tracing_pipe_fops = {
@@ -3609,17 +3562,20 @@ static const struct file_operations tracing_pipe_fops = {
 	.read		= tracing_read_pipe,
 	.splice_read	= tracing_splice_read_pipe,
 	.release	= tracing_release_pipe,
+	.llseek		= no_llseek,
 };
 
 static const struct file_operations tracing_entries_fops = {
 	.open		= tracing_open_generic,
 	.read		= tracing_entries_read,
 	.write		= tracing_entries_write,
+	.llseek		= generic_file_llseek,
 };
 
 static const struct file_operations tracing_mark_fops = {
 	.open		= tracing_open_generic,
 	.write		= tracing_mark_write,
+	.llseek		= generic_file_llseek,
 };
 
 static const struct file_operations trace_clock_fops = {
@@ -3925,6 +3881,7 @@ tracing_stats_read(struct file *filp, char __user *ubuf,
 static const struct file_operations tracing_stats_fops = {
 	.open		= tracing_open_generic,
 	.read		= tracing_stats_read,
+	.llseek		= generic_file_llseek,
 };
 
 #ifdef CONFIG_DYNAMIC_FTRACE
@@ -3961,6 +3918,7 @@ tracing_read_dyn_info(struct file *filp, char __user *ubuf,
 static const struct file_operations tracing_dyn_info_fops = {
 	.open		= tracing_open_generic,
 	.read		= tracing_read_dyn_info,
+	.llseek		= generic_file_llseek,
 };
 #endif
 
@@ -4114,6 +4072,7 @@ static const struct file_operations trace_options_fops = {
 	.open = tracing_open_generic,
 	.read = trace_options_read,
 	.write = trace_options_write,
+	.llseek	= generic_file_llseek,
 };
 
 static ssize_t
@@ -4165,6 +4124,7 @@ static const struct file_operations trace_options_core_fops = {
 	.open = tracing_open_generic,
 	.read = trace_options_core_read,
 	.write = trace_options_core_write,
+	.llseek = generic_file_llseek,
 };
 
 struct dentry *trace_create_file(const char *name,
@@ -4354,9 +4314,6 @@ static __init int tracer_init_debugfs(void)
 	trace_create_file("dyn_ftrace_total_info", 0444, d_tracer,
 			&ftrace_update_tot_cnt, &tracing_dyn_info_fops);
 #endif
-#ifdef CONFIG_SYSPROF_TRACER
-	init_tracer_sysprof_debugfs(d_tracer);
-#endif
 
 	create_trace_options_dir();
 
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 84d3f123e86f..638a5887e2ec 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -22,7 +22,6 @@ enum trace_type {
 	TRACE_STACK,
 	TRACE_PRINT,
 	TRACE_BPRINT,
-	TRACE_SPECIAL,
 	TRACE_MMIO_RW,
 	TRACE_MMIO_MAP,
 	TRACE_BRANCH,
@@ -189,7 +188,6 @@ extern void __ftrace_bad_type(void);
 		IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
 		IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT);	\
 		IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT);	\
-		IF_ASSIGN(var, ent, struct special_entry, 0);		\
 		IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,		\
 			  TRACE_MMIO_RW);				\
 		IF_ASSIGN(var, ent, struct trace_mmiotrace_map,		\
@@ -296,7 +294,6 @@ struct dentry *trace_create_file(const char *name,
 				 const struct file_operations *fops);
 
 struct dentry *tracing_init_dentry(void);
-void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
 
 struct ring_buffer_event;
 
@@ -333,11 +330,6 @@ void tracing_sched_wakeup_trace(struct trace_array *tr,
 				struct task_struct *wakee,
 				struct task_struct *cur,
 				unsigned long flags, int pc);
-void trace_special(struct trace_array *tr,
-		   struct trace_array_cpu *data,
-		   unsigned long arg1,
-		   unsigned long arg2,
-		   unsigned long arg3, int pc);
 void trace_function(struct trace_array *tr,
 		    unsigned long ip,
 		    unsigned long parent_ip,
@@ -428,8 +420,6 @@ extern int trace_selftest_startup_nop(struct tracer *trace,
 					 struct trace_array *tr);
 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
 					       struct trace_array *tr);
-extern int trace_selftest_startup_sysprof(struct tracer *trace,
-					       struct trace_array *tr);
 extern int trace_selftest_startup_branch(struct tracer *trace,
 					 struct trace_array *tr);
 #endif /* CONFIG_FTRACE_STARTUP_TEST */
diff --git a/kernel/trace/trace_entries.h b/kernel/trace/trace_entries.h
index 84128371f254..e3dfecaf13e6 100644
--- a/kernel/trace/trace_entries.h
+++ b/kernel/trace/trace_entries.h
@@ -151,23 +151,6 @@ FTRACE_ENTRY_DUP(wakeup, ctx_switch_entry,
 );
 
 /*
- * Special (free-form) trace entry:
- */
-FTRACE_ENTRY(special, special_entry,
-
-	TRACE_SPECIAL,
-
-	F_STRUCT(
-		__field(	unsigned long,	arg1	)
-		__field(	unsigned long,	arg2	)
-		__field(	unsigned long,	arg3	)
-	),
-
-	F_printk("(%08lx) (%08lx) (%08lx)",
-		 __entry->arg1, __entry->arg2, __entry->arg3)
-);
-
-/*
  * Stack-trace entry:
  */
 
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 57c1b4596470..a46197b80b7f 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -1069,65 +1069,6 @@ static struct trace_event trace_wake_event = {
 	.funcs		= &trace_wake_funcs,
 };
 
-/* TRACE_SPECIAL */
-static enum print_line_t trace_special_print(struct trace_iterator *iter,
-					     int flags, struct trace_event *event)
-{
-	struct special_entry *field;
-
-	trace_assign_type(field, iter->ent);
-
-	if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
-			      field->arg1,
-			      field->arg2,
-			      field->arg3))
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t trace_special_hex(struct trace_iterator *iter,
-					   int flags, struct trace_event *event)
-{
-	struct special_entry *field;
-	struct trace_seq *s = &iter->seq;
-
-	trace_assign_type(field, iter->ent);
-
-	SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
-	SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
-	SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
-
-	return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t trace_special_bin(struct trace_iterator *iter,
-					   int flags, struct trace_event *event)
-{
-	struct special_entry *field;
-	struct trace_seq *s = &iter->seq;
-
-	trace_assign_type(field, iter->ent);
-
-	SEQ_PUT_FIELD_RET(s, field->arg1);
-	SEQ_PUT_FIELD_RET(s, field->arg2);
-	SEQ_PUT_FIELD_RET(s, field->arg3);
-
-	return TRACE_TYPE_HANDLED;
-}
-
-static struct trace_event_functions trace_special_funcs = {
-	.trace		= trace_special_print,
-	.raw		= trace_special_print,
-	.hex		= trace_special_hex,
-	.binary		= trace_special_bin,
-};
-
-static struct trace_event trace_special_event = {
-	.type		= TRACE_SPECIAL,
-	.funcs		= &trace_special_funcs,
-};
-
 /* TRACE_STACK */
 
 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
@@ -1161,9 +1102,6 @@ static enum print_line_t trace_stack_print(struct trace_iterator *iter,
 
 static struct trace_event_functions trace_stack_funcs = {
 	.trace		= trace_stack_print,
-	.raw		= trace_special_print,
-	.hex		= trace_special_hex,
-	.binary		= trace_special_bin,
 };
 
 static struct trace_event trace_stack_event = {
@@ -1194,9 +1132,6 @@ static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
 
 static struct trace_event_functions trace_user_stack_funcs = {
 	.trace		= trace_user_stack_print,
-	.raw		= trace_special_print,
-	.hex		= trace_special_hex,
-	.binary		= trace_special_bin,
 };
 
 static struct trace_event trace_user_stack_event = {
@@ -1314,7 +1249,6 @@ static struct trace_event *events[] __initdata = {
 	&trace_fn_event,
 	&trace_ctx_event,
 	&trace_wake_event,
-	&trace_special_event,
 	&trace_stack_event,
 	&trace_user_stack_event,
 	&trace_bprint_event,
diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
index 39a5ca4cf15b..155a415b3209 100644
--- a/kernel/trace/trace_selftest.c
+++ b/kernel/trace/trace_selftest.c
@@ -13,7 +13,6 @@ static inline int trace_valid_entry(struct trace_entry *entry)
 	case TRACE_WAKE:
 	case TRACE_STACK:
 	case TRACE_PRINT:
-	case TRACE_SPECIAL:
 	case TRACE_BRANCH:
 	case TRACE_GRAPH_ENT:
 	case TRACE_GRAPH_RET:
@@ -690,38 +689,6 @@ trace_selftest_startup_sched_switch(struct tracer *trace, struct trace_array *tr
 }
 #endif /* CONFIG_CONTEXT_SWITCH_TRACER */
 
-#ifdef CONFIG_SYSPROF_TRACER
-int
-trace_selftest_startup_sysprof(struct tracer *trace, struct trace_array *tr)
-{
-	unsigned long count;
-	int ret;
-
-	/* start the tracing */
-	ret = tracer_init(trace, tr);
-	if (ret) {
-		warn_failed_init_tracer(trace, ret);
-		return ret;
-	}
-
-	/* Sleep for a 1/10 of a second */
-	msleep(100);
-	/* stop the tracing. */
-	tracing_stop();
-	/* check the trace buffer */
-	ret = trace_test_buffer(tr, &count);
-	trace->reset(tr);
-	tracing_start();
-
-	if (!ret && !count) {
-		printk(KERN_CONT ".. no entries found ..");
-		ret = -1;
-	}
-
-	return ret;
-}
-#endif /* CONFIG_SYSPROF_TRACER */
-
 #ifdef CONFIG_BRANCH_TRACER
 int
 trace_selftest_startup_branch(struct tracer *trace, struct trace_array *tr)
diff --git a/kernel/trace/trace_sysprof.c b/kernel/trace/trace_sysprof.c
deleted file mode 100644
index c080956f4d8e..000000000000
--- a/kernel/trace/trace_sysprof.c
+++ /dev/null
@@ -1,330 +0,0 @@
-/*
- * trace stack traces
- *
- * Copyright (C) 2004-2008, Soeren Sandmann
- * Copyright (C) 2007 Steven Rostedt <srostedt@redhat.com>
- * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com>
- */
-#include <linux/kallsyms.h>
-#include <linux/debugfs.h>
-#include <linux/hrtimer.h>
-#include <linux/uaccess.h>
-#include <linux/ftrace.h>
-#include <linux/module.h>
-#include <linux/irq.h>
-#include <linux/fs.h>
-
-#include <asm/stacktrace.h>
-
-#include "trace.h"
-
-static struct trace_array	*sysprof_trace;
-static int __read_mostly	tracer_enabled;
-
-/*
- * 1 msec sample interval by default:
- */
-static unsigned long sample_period = 1000000;
-static const unsigned int sample_max_depth = 512;
-
-static DEFINE_MUTEX(sample_timer_lock);
-/*
- * Per CPU hrtimers that do the profiling:
- */
-static DEFINE_PER_CPU(struct hrtimer, stack_trace_hrtimer);
-
-struct stack_frame_user {
-	const void __user	*next_fp;
-	unsigned long		return_address;
-};
-
-static int
-copy_stack_frame(const void __user *fp, struct stack_frame_user *frame)
-{
-	int ret;
-
-	if (!access_ok(VERIFY_READ, fp, sizeof(*frame)))
-		return 0;
-
-	ret = 1;
-	pagefault_disable();
-	if (__copy_from_user_inatomic(frame, fp, sizeof(*frame)))
-		ret = 0;
-	pagefault_enable();
-
-	return ret;
-}
-
-struct backtrace_info {
-	struct trace_array_cpu	*data;
-	struct trace_array	*tr;
-	int			pos;
-};
-
-static void
-backtrace_warning_symbol(void *data, char *msg, unsigned long symbol)
-{
-	/* Ignore warnings */
-}
-
-static void backtrace_warning(void *data, char *msg)
-{
-	/* Ignore warnings */
-}
-
-static int backtrace_stack(void *data, char *name)
-{
-	/* Don't bother with IRQ stacks for now */
-	return -1;
-}
-
-static void backtrace_address(void *data, unsigned long addr, int reliable)
-{
-	struct backtrace_info *info = data;
-
-	if (info->pos < sample_max_depth && reliable) {
-		__trace_special(info->tr, info->data, 1, addr, 0);
-
-		info->pos++;
-	}
-}
-
-static const struct stacktrace_ops backtrace_ops = {
-	.warning		= backtrace_warning,
-	.warning_symbol		= backtrace_warning_symbol,
-	.stack			= backtrace_stack,
-	.address		= backtrace_address,
-	.walk_stack		= print_context_stack,
-};
-
-static int
-trace_kernel(struct pt_regs *regs, struct trace_array *tr,
-	     struct trace_array_cpu *data)
-{
-	struct backtrace_info info;
-	unsigned long bp;
-	char *stack;
-
-	info.tr = tr;
-	info.data = data;
-	info.pos = 1;
-
-	__trace_special(info.tr, info.data, 1, regs->ip, 0);
-
-	stack = ((char *)regs + sizeof(struct pt_regs));
-#ifdef CONFIG_FRAME_POINTER
-	bp = regs->bp;
-#else
-	bp = 0;
-#endif
-
-	dump_trace(NULL, regs, (void *)stack, bp, &backtrace_ops, &info);
-
-	return info.pos;
-}
-
-static void timer_notify(struct pt_regs *regs, int cpu)
-{
-	struct trace_array_cpu *data;
-	struct stack_frame_user frame;
-	struct trace_array *tr;
-	const void __user *fp;
-	int is_user;
-	int i;
-
-	if (!regs)
-		return;
-
-	tr = sysprof_trace;
-	data = tr->data[cpu];
-	is_user = user_mode(regs);
-
-	if (!current || current->pid == 0)
-		return;
-
-	if (is_user && current->state != TASK_RUNNING)
-		return;
-
-	__trace_special(tr, data, 0, 0, current->pid);
-
-	if (!is_user)
-		i = trace_kernel(regs, tr, data);
-	else
-		i = 0;
-
-	/*
-	 * Trace user stack if we are not a kernel thread
-	 */
-	if (current->mm && i < sample_max_depth) {
-		regs = (struct pt_regs *)current->thread.sp0 - 1;
-
-		fp = (void __user *)regs->bp;
-
-		__trace_special(tr, data, 2, regs->ip, 0);
-
-		while (i < sample_max_depth) {
-			frame.next_fp = NULL;
-			frame.return_address = 0;
-			if (!copy_stack_frame(fp, &frame))
-				break;
-			if ((unsigned long)fp < regs->sp)
-				break;
-
-			__trace_special(tr, data, 2, frame.return_address,
-					(unsigned long)fp);
-			fp = frame.next_fp;
-
-			i++;
-		}
-
-	}
-
-	/*
-	 * Special trace entry if we overflow the max depth:
-	 */
-	if (i == sample_max_depth)
-		__trace_special(tr, data, -1, -1, -1);
-
-	__trace_special(tr, data, 3, current->pid, i);
-}
-
-static enum hrtimer_restart stack_trace_timer_fn(struct hrtimer *hrtimer)
-{
-	/* trace here */
-	timer_notify(get_irq_regs(), smp_processor_id());
-
-	hrtimer_forward_now(hrtimer, ns_to_ktime(sample_period));
-
-	return HRTIMER_RESTART;
-}
-
-static void start_stack_timer(void *unused)
-{
-	struct hrtimer *hrtimer = &__get_cpu_var(stack_trace_hrtimer);
-
-	hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
-	hrtimer->function = stack_trace_timer_fn;
-
-	hrtimer_start(hrtimer, ns_to_ktime(sample_period),
-		      HRTIMER_MODE_REL_PINNED);
-}
-
-static void start_stack_timers(void)
-{
-	on_each_cpu(start_stack_timer, NULL, 1);
-}
-
-static void stop_stack_timer(int cpu)
-{
-	struct hrtimer *hrtimer = &per_cpu(stack_trace_hrtimer, cpu);
-
-	hrtimer_cancel(hrtimer);
-}
-
-static void stop_stack_timers(void)
-{
-	int cpu;
-
-	for_each_online_cpu(cpu)
-		stop_stack_timer(cpu);
-}
-
-static void stop_stack_trace(struct trace_array *tr)
-{
-	mutex_lock(&sample_timer_lock);
-	stop_stack_timers();
-	tracer_enabled = 0;
-	mutex_unlock(&sample_timer_lock);
-}
-
-static int stack_trace_init(struct trace_array *tr)
-{
-	sysprof_trace = tr;
-
-	tracing_start_cmdline_record();
-
-	mutex_lock(&sample_timer_lock);
-	start_stack_timers();
-	tracer_enabled = 1;
-	mutex_unlock(&sample_timer_lock);
-	return 0;
-}
-
-static void stack_trace_reset(struct trace_array *tr)
-{
-	tracing_stop_cmdline_record();
-	stop_stack_trace(tr);
-}
-
-static struct tracer stack_trace __read_mostly =
-{
-	.name		= "sysprof",
-	.init		= stack_trace_init,
-	.reset		= stack_trace_reset,
-#ifdef CONFIG_FTRACE_SELFTEST
-	.selftest    = trace_selftest_startup_sysprof,
-#endif
-};
-
-__init static int init_stack_trace(void)
-{
-	return register_tracer(&stack_trace);
-}
-device_initcall(init_stack_trace);
-
-#define MAX_LONG_DIGITS 22
-
-static ssize_t
-sysprof_sample_read(struct file *filp, char __user *ubuf,
-		    size_t cnt, loff_t *ppos)
-{
-	char buf[MAX_LONG_DIGITS];
-	int r;
-
-	r = sprintf(buf, "%ld\n", nsecs_to_usecs(sample_period));
-
-	return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
-}
-
-static ssize_t
-sysprof_sample_write(struct file *filp, const char __user *ubuf,
-		     size_t cnt, loff_t *ppos)
-{
-	char buf[MAX_LONG_DIGITS];
-	unsigned long val;
-
-	if (cnt > MAX_LONG_DIGITS-1)
-		cnt = MAX_LONG_DIGITS-1;
-
-	if (copy_from_user(&buf, ubuf, cnt))
-		return -EFAULT;
-
-	buf[cnt] = 0;
-
-	val = simple_strtoul(buf, NULL, 10);
-	/*
-	 * Enforce a minimum sample period of 100 usecs:
-	 */
-	if (val < 100)
-		val = 100;
-
-	mutex_lock(&sample_timer_lock);
-	stop_stack_timers();
-	sample_period = val * 1000;
-	start_stack_timers();
-	mutex_unlock(&sample_timer_lock);
-
-	return cnt;
-}
-
-static const struct file_operations sysprof_sample_fops = {
-	.read		= sysprof_sample_read,
-	.write		= sysprof_sample_write,
-};
-
-void init_tracer_sysprof_debugfs(struct dentry *d_tracer)
-{
-
-	trace_create_file("sysprof_sample_period", 0644,
-			d_tracer, NULL, &sysprof_sample_fops);
-}