trace.c 80.3 KB
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/*
 * ring buffer based function tracer
 *
 * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com>
 * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com>
 *
 * Originally taken from the RT patch by:
 *    Arnaldo Carvalho de Melo <acme@redhat.com>
 *
 * Based on code from the latency_tracer, that is:
 *  Copyright (C) 2004-2006 Ingo Molnar
 *  Copyright (C) 2004 William Lee Irwin III
 */
#include <linux/utsrelease.h>
#include <linux/kallsyms.h>
#include <linux/seq_file.h>
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#include <linux/notifier.h>
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#include <linux/debugfs.h>
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#include <linux/pagemap.h>
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#include <linux/hardirq.h>
#include <linux/linkage.h>
#include <linux/uaccess.h>
#include <linux/ftrace.h>
#include <linux/module.h>
#include <linux/percpu.h>
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#include <linux/kdebug.h>
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#include <linux/ctype.h>
#include <linux/init.h>
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#include <linux/poll.h>
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#include <linux/gfp.h>
#include <linux/fs.h>
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#include <linux/kprobes.h>
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#include <linux/writeback.h>
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#include <linux/stacktrace.h>

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#include "trace.h"

unsigned long __read_mostly	tracing_max_latency = (cycle_t)ULONG_MAX;
unsigned long __read_mostly	tracing_thresh;

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static unsigned long __read_mostly	tracing_nr_buffers;
static cpumask_t __read_mostly		tracing_buffer_mask;

#define for_each_tracing_cpu(cpu)	\
	for_each_cpu_mask(cpu, tracing_buffer_mask)

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static int trace_alloc_page(void);
static int trace_free_page(void);

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static int tracing_disabled = 1;

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static unsigned long tracing_pages_allocated;

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long
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ns2usecs(cycle_t nsec)
{
	nsec += 500;
	do_div(nsec, 1000);
	return nsec;
}

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cycle_t ftrace_now(int cpu)
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{
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	return cpu_clock(cpu);
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}

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/*
 * The global_trace is the descriptor that holds the tracing
 * buffers for the live tracing. For each CPU, it contains
 * a link list of pages that will store trace entries. The
 * page descriptor of the pages in the memory is used to hold
 * the link list by linking the lru item in the page descriptor
 * to each of the pages in the buffer per CPU.
 *
 * For each active CPU there is a data field that holds the
 * pages for the buffer for that CPU. Each CPU has the same number
 * of pages allocated for its buffer.
 */
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static struct trace_array	global_trace;

static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu);

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/*
 * The max_tr is used to snapshot the global_trace when a maximum
 * latency is reached. Some tracers will use this to store a maximum
 * trace while it continues examining live traces.
 *
 * The buffers for the max_tr are set up the same as the global_trace.
 * When a snapshot is taken, the link list of the max_tr is swapped
 * with the link list of the global_trace and the buffers are reset for
 * the global_trace so the tracing can continue.
 */
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static struct trace_array	max_tr;

static DEFINE_PER_CPU(struct trace_array_cpu, max_data);

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/* tracer_enabled is used to toggle activation of a tracer */
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static int			tracer_enabled = 1;
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/* function tracing enabled */
int				ftrace_function_enabled;

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/*
 * trace_nr_entries is the number of entries that is allocated
 * for a buffer. Note, the number of entries is always rounded
 * to ENTRIES_PER_PAGE.
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 *
 * This number is purposely set to a low number of 16384.
 * If the dump on oops happens, it will be much appreciated
 * to not have to wait for all that output. Anyway this can be
 * boot time and run time configurable.
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 */
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#define TRACE_ENTRIES_DEFAULT	16384UL

static unsigned long		trace_nr_entries = TRACE_ENTRIES_DEFAULT;
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/* trace_types holds a link list of available tracers. */
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static struct tracer		*trace_types __read_mostly;
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/* current_trace points to the tracer that is currently active */
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static struct tracer		*current_trace __read_mostly;
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/*
 * max_tracer_type_len is used to simplify the allocating of
 * buffers to read userspace tracer names. We keep track of
 * the longest tracer name registered.
 */
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static int			max_tracer_type_len;

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/*
 * trace_types_lock is used to protect the trace_types list.
 * This lock is also used to keep user access serialized.
 * Accesses from userspace will grab this lock while userspace
 * activities happen inside the kernel.
 */
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static DEFINE_MUTEX(trace_types_lock);
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/* trace_wait is a waitqueue for tasks blocked on trace_poll */
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static DECLARE_WAIT_QUEUE_HEAD(trace_wait);

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/* trace_flags holds iter_ctrl options */
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unsigned long trace_flags = TRACE_ITER_PRINT_PARENT;

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/**
 * trace_wake_up - wake up tasks waiting for trace input
 *
 * Simply wakes up any task that is blocked on the trace_wait
 * queue. These is used with trace_poll for tasks polling the trace.
 */
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void trace_wake_up(void)
{
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	/*
	 * The runqueue_is_locked() can fail, but this is the best we
	 * have for now:
	 */
	if (!(trace_flags & TRACE_ITER_BLOCK) && !runqueue_is_locked())
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		wake_up(&trace_wait);
}
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#define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(struct trace_entry))

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static int __init set_nr_entries(char *str)
{
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	unsigned long nr_entries;
	int ret;

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	if (!str)
		return 0;
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	ret = strict_strtoul(str, 0, &nr_entries);
	/* nr_entries can not be zero */
	if (ret < 0 || nr_entries == 0)
		return 0;
	trace_nr_entries = nr_entries;
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	return 1;
}
__setup("trace_entries=", set_nr_entries);

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unsigned long nsecs_to_usecs(unsigned long nsecs)
{
	return nsecs / 1000;
}

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/*
 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
 * control the output of kernel symbols.
 */
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#define TRACE_ITER_SYM_MASK \
	(TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)

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/* These must match the bit postions in trace_iterator_flags */
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static const char *trace_options[] = {
	"print-parent",
	"sym-offset",
	"sym-addr",
	"verbose",
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	"raw",
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	"hex",
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	"bin",
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	"block",
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	"stacktrace",
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	"sched-tree",
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	"ftrace_printk",
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	NULL
};

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/*
 * ftrace_max_lock is used to protect the swapping of buffers
 * when taking a max snapshot. The buffers themselves are
 * protected by per_cpu spinlocks. But the action of the swap
 * needs its own lock.
 *
 * This is defined as a raw_spinlock_t in order to help
 * with performance when lockdep debugging is enabled.
 */
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static raw_spinlock_t ftrace_max_lock =
	(raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
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/*
 * Copy the new maximum trace into the separate maximum-trace
 * structure. (this way the maximum trace is permanently saved,
 * for later retrieval via /debugfs/tracing/latency_trace)
 */
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static void
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__update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
{
	struct trace_array_cpu *data = tr->data[cpu];

	max_tr.cpu = cpu;
	max_tr.time_start = data->preempt_timestamp;

	data = max_tr.data[cpu];
	data->saved_latency = tracing_max_latency;

	memcpy(data->comm, tsk->comm, TASK_COMM_LEN);
	data->pid = tsk->pid;
	data->uid = tsk->uid;
	data->nice = tsk->static_prio - 20 - MAX_RT_PRIO;
	data->policy = tsk->policy;
	data->rt_priority = tsk->rt_priority;

	/* record this tasks comm */
	tracing_record_cmdline(current);
}

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#define CHECK_COND(cond)			\
	if (unlikely(cond)) {			\
		tracing_disabled = 1;		\
		WARN_ON(1);			\
		return -1;			\
	}

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/**
 * check_pages - integrity check of trace buffers
 *
 * As a safty measure we check to make sure the data pages have not
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 * been corrupted.
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 */
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int check_pages(struct trace_array_cpu *data)
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{
	struct page *page, *tmp;

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	CHECK_COND(data->trace_pages.next->prev != &data->trace_pages);
	CHECK_COND(data->trace_pages.prev->next != &data->trace_pages);
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	list_for_each_entry_safe(page, tmp, &data->trace_pages, lru) {
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		CHECK_COND(page->lru.next->prev != &page->lru);
		CHECK_COND(page->lru.prev->next != &page->lru);
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	}
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	return 0;
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}

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/**
 * head_page - page address of the first page in per_cpu buffer.
 *
 * head_page returns the page address of the first page in
 * a per_cpu buffer. This also preforms various consistency
 * checks to make sure the buffer has not been corrupted.
 */
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void *head_page(struct trace_array_cpu *data)
{
	struct page *page;

	if (list_empty(&data->trace_pages))
		return NULL;

	page = list_entry(data->trace_pages.next, struct page, lru);
	BUG_ON(&page->lru == &data->trace_pages);

	return page_address(page);
}

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/**
 * trace_seq_printf - sequence printing of trace information
 * @s: trace sequence descriptor
 * @fmt: printf format string
 *
 * The tracer may use either sequence operations or its own
 * copy to user routines. To simplify formating of a trace
 * trace_seq_printf is used to store strings into a special
 * buffer (@s). Then the output may be either used by
 * the sequencer or pulled into another buffer.
 */
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int
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trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
{
	int len = (PAGE_SIZE - 1) - s->len;
	va_list ap;
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	int ret;
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	if (!len)
		return 0;

	va_start(ap, fmt);
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	ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
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	va_end(ap);

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	/* If we can't write it all, don't bother writing anything */
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	if (ret >= len)
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		return 0;

	s->len += ret;
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	return len;
}

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/**
 * trace_seq_puts - trace sequence printing of simple string
 * @s: trace sequence descriptor
 * @str: simple string to record
 *
 * The tracer may use either the sequence operations or its own
 * copy to user routines. This function records a simple string
 * into a special buffer (@s) for later retrieval by a sequencer
 * or other mechanism.
 */
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static int
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trace_seq_puts(struct trace_seq *s, const char *str)
{
	int len = strlen(str);

	if (len > ((PAGE_SIZE - 1) - s->len))
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		return 0;
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	memcpy(s->buffer + s->len, str, len);
	s->len += len;

	return len;
}

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static int
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trace_seq_putc(struct trace_seq *s, unsigned char c)
{
	if (s->len >= (PAGE_SIZE - 1))
		return 0;

	s->buffer[s->len++] = c;

	return 1;
}

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static int
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trace_seq_putmem(struct trace_seq *s, void *mem, size_t len)
{
	if (len > ((PAGE_SIZE - 1) - s->len))
		return 0;

	memcpy(s->buffer + s->len, mem, len);
	s->len += len;

	return len;
}

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#define HEX_CHARS 17
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static const char hex2asc[] = "0123456789abcdef";
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static int
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trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len)
{
	unsigned char hex[HEX_CHARS];
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	unsigned char *data = mem;
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	unsigned char byte;
	int i, j;

	BUG_ON(len >= HEX_CHARS);

#ifdef __BIG_ENDIAN
	for (i = 0, j = 0; i < len; i++) {
#else
	for (i = len-1, j = 0; i >= 0; i--) {
#endif
		byte = data[i];

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		hex[j++] = hex2asc[byte & 0x0f];
		hex[j++] = hex2asc[byte >> 4];
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	}
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	hex[j++] = ' ';
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	return trace_seq_putmem(s, hex, j);
}

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static void
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trace_seq_reset(struct trace_seq *s)
{
	s->len = 0;
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	s->readpos = 0;
}

ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt)
{
	int len;
	int ret;

	if (s->len <= s->readpos)
		return -EBUSY;

	len = s->len - s->readpos;
	if (cnt > len)
		cnt = len;
	ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt);
	if (ret)
		return -EFAULT;

	s->readpos += len;
	return cnt;
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}

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static void
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trace_print_seq(struct seq_file *m, struct trace_seq *s)
{
	int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;

	s->buffer[len] = 0;
	seq_puts(m, s->buffer);

	trace_seq_reset(s);
}

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/*
 * flip the trace buffers between two trace descriptors.
 * This usually is the buffers between the global_trace and
 * the max_tr to record a snapshot of a current trace.
 *
 * The ftrace_max_lock must be held.
 */
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static void
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flip_trace(struct trace_array_cpu *tr1, struct trace_array_cpu *tr2)
{
	struct list_head flip_pages;

	INIT_LIST_HEAD(&flip_pages);

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	memcpy(&tr1->trace_head_idx, &tr2->trace_head_idx,
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		sizeof(struct trace_array_cpu) -
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		offsetof(struct trace_array_cpu, trace_head_idx));
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	check_pages(tr1);
	check_pages(tr2);
	list_splice_init(&tr1->trace_pages, &flip_pages);
	list_splice_init(&tr2->trace_pages, &tr1->trace_pages);
	list_splice_init(&flip_pages, &tr2->trace_pages);
	BUG_ON(!list_empty(&flip_pages));
	check_pages(tr1);
	check_pages(tr2);
}

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/**
 * update_max_tr - snapshot all trace buffers from global_trace to max_tr
 * @tr: tracer
 * @tsk: the task with the latency
 * @cpu: The cpu that initiated the trace.
 *
 * Flip the buffers between the @tr and the max_tr and record information
 * about which task was the cause of this latency.
 */
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void
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update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
{
	struct trace_array_cpu *data;
	int i;

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	WARN_ON_ONCE(!irqs_disabled());
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	__raw_spin_lock(&ftrace_max_lock);
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	/* clear out all the previous traces */
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	for_each_tracing_cpu(i) {
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		data = tr->data[i];
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		flip_trace(max_tr.data[i], data);
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		tracing_reset(data);
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	}

	__update_max_tr(tr, tsk, cpu);
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	__raw_spin_unlock(&ftrace_max_lock);
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}

/**
 * update_max_tr_single - only copy one trace over, and reset the rest
 * @tr - tracer
 * @tsk - task with the latency
 * @cpu - the cpu of the buffer to copy.
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 *
 * Flip the trace of a single CPU buffer between the @tr and the max_tr.
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 */
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void
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update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu)
{
	struct trace_array_cpu *data = tr->data[cpu];
	int i;

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	WARN_ON_ONCE(!irqs_disabled());
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	__raw_spin_lock(&ftrace_max_lock);
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	for_each_tracing_cpu(i)
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		tracing_reset(max_tr.data[i]);

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	flip_trace(max_tr.data[cpu], data);
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	tracing_reset(data);
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	__update_max_tr(tr, tsk, cpu);
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	__raw_spin_unlock(&ftrace_max_lock);
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}

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/**
 * register_tracer - register a tracer with the ftrace system.
 * @type - the plugin for the tracer
 *
 * Register a new plugin tracer.
 */
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int register_tracer(struct tracer *type)
{
	struct tracer *t;
	int len;
	int ret = 0;

	if (!type->name) {
		pr_info("Tracer must have a name\n");
		return -1;
	}

	mutex_lock(&trace_types_lock);
	for (t = trace_types; t; t = t->next) {
		if (strcmp(type->name, t->name) == 0) {
			/* already found */
			pr_info("Trace %s already registered\n",
				type->name);
			ret = -1;
			goto out;
		}
	}

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#ifdef CONFIG_FTRACE_STARTUP_TEST
	if (type->selftest) {
		struct tracer *saved_tracer = current_trace;
		struct trace_array_cpu *data;
		struct trace_array *tr = &global_trace;
		int saved_ctrl = tr->ctrl;
		int i;
		/*
		 * Run a selftest on this tracer.
		 * Here we reset the trace buffer, and set the current
		 * tracer to be this tracer. The tracer can then run some
		 * internal tracing to verify that everything is in order.
		 * If we fail, we do not register this tracer.
		 */
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		for_each_tracing_cpu(i) {
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			data = tr->data[i];
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			if (!head_page(data))
				continue;
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			tracing_reset(data);
		}
		current_trace = type;
		tr->ctrl = 0;
		/* the test is responsible for initializing and enabling */
		pr_info("Testing tracer %s: ", type->name);
		ret = type->selftest(type, tr);
		/* the test is responsible for resetting too */
		current_trace = saved_tracer;
		tr->ctrl = saved_ctrl;
		if (ret) {
			printk(KERN_CONT "FAILED!\n");
			goto out;
		}
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		/* Only reset on passing, to avoid touching corrupted buffers */
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		for_each_tracing_cpu(i) {
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			data = tr->data[i];
			if (!head_page(data))
				continue;
			tracing_reset(data);
		}
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		printk(KERN_CONT "PASSED\n");
	}
#endif

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	type->next = trace_types;
	trace_types = type;
	len = strlen(type->name);
	if (len > max_tracer_type_len)
		max_tracer_type_len = len;
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 out:
	mutex_unlock(&trace_types_lock);

	return ret;
}

void unregister_tracer(struct tracer *type)
{
	struct tracer **t;
	int len;

	mutex_lock(&trace_types_lock);
	for (t = &trace_types; *t; t = &(*t)->next) {
		if (*t == type)
			goto found;
	}
	pr_info("Trace %s not registered\n", type->name);
	goto out;

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	*t = (*t)->next;
	if (strlen(type->name) != max_tracer_type_len)
		goto out;

	max_tracer_type_len = 0;
	for (t = &trace_types; *t; t = &(*t)->next) {
		len = strlen((*t)->name);
		if (len > max_tracer_type_len)
			max_tracer_type_len = len;
	}
 out:
	mutex_unlock(&trace_types_lock);
}

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void tracing_reset(struct trace_array_cpu *data)
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{
	data->trace_idx = 0;
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	data->overrun = 0;
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	data->trace_head = data->trace_tail = head_page(data);
	data->trace_head_idx = 0;
	data->trace_tail_idx = 0;
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}

#define SAVED_CMDLINES 128
static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1];
static unsigned map_cmdline_to_pid[SAVED_CMDLINES];
static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN];
static int cmdline_idx;
static DEFINE_SPINLOCK(trace_cmdline_lock);
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/* temporary disable recording */
atomic_t trace_record_cmdline_disabled __read_mostly;
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static void trace_init_cmdlines(void)
{
	memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline));
	memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid));
	cmdline_idx = 0;
}

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void trace_stop_cmdline_recording(void);
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static void trace_save_cmdline(struct task_struct *tsk)
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{
	unsigned map;
	unsigned idx;

	if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT))
		return;

	/*
	 * It's not the end of the world if we don't get
	 * the lock, but we also don't want to spin
	 * nor do we want to disable interrupts,
	 * so if we miss here, then better luck next time.
	 */
	if (!spin_trylock(&trace_cmdline_lock))
		return;

	idx = map_pid_to_cmdline[tsk->pid];
	if (idx >= SAVED_CMDLINES) {
		idx = (cmdline_idx + 1) % SAVED_CMDLINES;

		map = map_cmdline_to_pid[idx];
		if (map <= PID_MAX_DEFAULT)
			map_pid_to_cmdline[map] = (unsigned)-1;

		map_pid_to_cmdline[tsk->pid] = idx;

		cmdline_idx = idx;
	}

	memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN);

	spin_unlock(&trace_cmdline_lock);
}

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static char *trace_find_cmdline(int pid)
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{
	char *cmdline = "<...>";
	unsigned map;

	if (!pid)
		return "<idle>";

	if (pid > PID_MAX_DEFAULT)
		goto out;

	map = map_pid_to_cmdline[pid];
	if (map >= SAVED_CMDLINES)
		goto out;

	cmdline = saved_cmdlines[map];

 out:
	return cmdline;
}

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void tracing_record_cmdline(struct task_struct *tsk)
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{
	if (atomic_read(&trace_record_cmdline_disabled))
		return;

	trace_save_cmdline(tsk);
}

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static inline struct list_head *
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trace_next_list(struct trace_array_cpu *data, struct list_head *next)
{
	/*
	 * Roundrobin - but skip the head (which is not a real page):
	 */
	next = next->next;
	if (unlikely(next == &data->trace_pages))
		next = next->next;
	BUG_ON(next == &data->trace_pages);

	return next;
}

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static inline void *
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trace_next_page(struct trace_array_cpu *data, void *addr)
{
	struct list_head *next;
	struct page *page;

	page = virt_to_page(addr);

	next = trace_next_list(data, &page->lru);
	page = list_entry(next, struct page, lru);

	return page_address(page);
}

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struct trace_entry *
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tracing_get_trace_entry(struct trace_array *tr, struct trace_array_cpu *data)
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{
	unsigned long idx, idx_next;
	struct trace_entry *entry;

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	data->trace_idx++;
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	idx = data->trace_head_idx;
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	idx_next = idx + 1;

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	BUG_ON(idx * TRACE_ENTRY_SIZE >= PAGE_SIZE);

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	entry = data->trace_head + idx * TRACE_ENTRY_SIZE;
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	if (unlikely(idx_next >= ENTRIES_PER_PAGE)) {
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		data->trace_head = trace_next_page(data, data->trace_head);
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		idx_next = 0;
	}

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	if (data->trace_head == data->trace_tail &&
	    idx_next == data->trace_tail_idx) {
		/* overrun */
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		data->overrun++;
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		data->trace_tail_idx++;
		if (data->trace_tail_idx >= ENTRIES_PER_PAGE) {
			data->trace_tail =
				trace_next_page(data, data->trace_tail);
			data->trace_tail_idx = 0;
		}
	}

	data->trace_head_idx = idx_next;
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	return entry;
}

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void
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tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags)
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{
	struct task_struct *tsk = current;
	unsigned long pc;

	pc = preempt_count();

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	entry->field.preempt_count	= pc & 0xff;
	entry->field.pid		= (tsk) ? tsk->pid : 0;
	entry->field.t			= ftrace_now(raw_smp_processor_id());
	entry->field.flags =
		(irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) |
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		((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) |
		((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) |
		(need_resched() ? TRACE_FLAG_NEED_RESCHED : 0);
}

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void
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trace_function(struct trace_array *tr, struct trace_array_cpu *data,
	       unsigned long ip, unsigned long parent_ip, unsigned long flags)
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{
	struct trace_entry *entry;
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	unsigned long irq_flags;
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	raw_local_irq_save(irq_flags);
	__raw_spin_lock(&data->lock);
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	entry				= tracing_get_trace_entry(tr, data);
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	tracing_generic_entry_update(entry, flags);
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	entry->type			= TRACE_FN;
	entry->field.fn.ip		= ip;
	entry->field.fn.parent_ip	= parent_ip;
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	__raw_spin_unlock(&data->lock);
	raw_local_irq_restore(irq_flags);
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}

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void
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ftrace(struct trace_array *tr, struct trace_array_cpu *data,
       unsigned long ip, unsigned long parent_ip, unsigned long flags)
{
	if (likely(!atomic_read(&data->disabled)))
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		trace_function(tr, data, ip, parent_ip, flags);
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}

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void __trace_stack(struct trace_array *tr,
		   struct trace_array_cpu *data,
		   unsigned long flags,
		   int skip)
{
	struct trace_entry *entry;
	struct stack_trace trace;

	if (!(trace_flags & TRACE_ITER_STACKTRACE))
		return;

	entry			= tracing_get_trace_entry(tr, data);
	tracing_generic_entry_update(entry, flags);
	entry->type		= TRACE_STACK;

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	memset(&entry->field.stack, 0, sizeof(entry->field.stack));
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	trace.nr_entries	= 0;
	trace.max_entries	= FTRACE_STACK_ENTRIES;
	trace.skip		= skip;
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	trace.entries		= entry->field.stack.caller;
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	save_stack_trace(&trace);
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}

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void
__trace_special(void *__tr, void *__data,
		unsigned long arg1, unsigned long arg2, unsigned long arg3)
{
	struct trace_array_cpu *data = __data;
	struct trace_array *tr = __tr;
	struct trace_entry *entry;
	unsigned long irq_flags;

	raw_local_irq_save(irq_flags);
	__raw_spin_lock(&data->lock);
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	entry				= tracing_get_trace_entry(tr, data);
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	tracing_generic_entry_update(entry, 0);
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	entry->type			= TRACE_SPECIAL;
	entry->field.special.arg1	= arg1;
	entry->field.special.arg2	= arg2;
	entry->field.special.arg3	= arg3;
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	__trace_stack(tr, data, irq_flags, 4);
	__raw_spin_unlock(&data->lock);
	raw_local_irq_restore(irq_flags);

	trace_wake_up();
}

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void
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tracing_sched_switch_trace(struct trace_array *tr,
			   struct trace_array_cpu *data,
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			   struct task_struct *prev,
			   struct task_struct *next,
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			   unsigned long flags)
{
	struct trace_entry *entry;
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	unsigned long irq_flags;
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	raw_local_irq_save(irq_flags);
	__raw_spin_lock(&data->lock);
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	entry				= tracing_get_trace_entry(tr, data);
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	tracing_generic_entry_update(entry, flags);
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	entry->type			= TRACE_CTX;
	entry->field.ctx.prev_pid	= prev->pid;
	entry->field.ctx.prev_prio	= prev->prio;
	entry->field.ctx.prev_state	= prev->state;
	entry->field.ctx.next_pid	= next->pid;
	entry->field.ctx.next_prio	= next->prio;
	entry->field.ctx.next_state	= next->state;
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	entry->field.ctx.next_cpu	= task_cpu(next);
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	__trace_stack(tr, data, flags, 5);
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	__raw_spin_unlock(&data->lock);
	raw_local_irq_restore(irq_flags);
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}

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void
tracing_sched_wakeup_trace(struct trace_array *tr,
			   struct trace_array_cpu *data,
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			   struct task_struct *wakee,
			   struct task_struct *curr,
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			   unsigned long flags)
{
	struct trace_entry *entry;
	unsigned long irq_flags;

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	raw_local_irq_save(irq_flags);
	__raw_spin_lock(&data->lock);
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	entry			= tracing_get_trace_entry(tr, data);
	tracing_generic_entry_update(entry, flags);
	entry->type		= TRACE_WAKE;
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	entry->field.ctx.prev_pid	= curr->pid;
	entry->field.ctx.prev_prio	= curr->prio;
	entry->field.ctx.prev_state	= curr->state;
	entry->field.ctx.next_pid	= wakee->pid;
	entry->field.ctx.next_prio	= wakee->prio;
	entry->field.ctx.next_state	= wakee->state;
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	entry->field.ctx.next_cpu	= task_cpu(wakee);
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	__trace_stack(tr, data, flags, 6);
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	__raw_spin_unlock(&data->lock);
	raw_local_irq_restore(irq_flags);
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	trace_wake_up();
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}

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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;
	long disabled;
	int cpu;

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	if (tracing_disabled || !tr->ctrl)
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		return;

	local_irq_save(flags);
	cpu = raw_smp_processor_id();
	data = tr->data[cpu];
	disabled = atomic_inc_return(&data->disabled);

	if (likely(disabled == 1))
		__trace_special(tr, data, arg1, arg2, arg3);

	atomic_dec(&data->disabled);
	local_irq_restore(flags);
}

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#ifdef CONFIG_FTRACE
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static void
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function_trace_call(unsigned long ip, unsigned long parent_ip)
{
	struct trace_array *tr = &global_trace;
	struct trace_array_cpu *data;
	unsigned long flags;
	long disabled;
	int cpu;

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	if (unlikely(!ftrace_function_enabled))
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		return;

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	if (skip_trace(ip))
		return;

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	local_irq_save(flags);
	cpu = raw_smp_processor_id();
	data = tr->data[cpu];
	disabled = atomic_inc_return(&data->disabled);

	if (likely(disabled == 1))
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		trace_function(tr, data, ip, parent_ip, flags);
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	atomic_dec(&data->disabled);
	local_irq_restore(flags);
}

static struct ftrace_ops trace_ops __read_mostly =
{
	.func = function_trace_call,
};

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void tracing_start_function_trace(void)
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{
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	ftrace_function_enabled = 0;
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	register_ftrace_function(&trace_ops);
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	if (tracer_enabled)
		ftrace_function_enabled = 1;
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}

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void tracing_stop_function_trace(void)
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{
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	ftrace_function_enabled = 0;
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	unregister_ftrace_function(&trace_ops);
}
#endif

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enum trace_file_type {
	TRACE_FILE_LAT_FMT	= 1,
};

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/* Return the current entry.  */
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static struct trace_entry *
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trace_entry_idx(struct trace_array *tr, struct trace_array_cpu *data,
		struct trace_iterator *iter, int cpu)
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{
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	struct page *page;
	struct trace_entry *array;
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	if (iter->next_idx[cpu] >= tr->entries ||
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	    iter->next_idx[cpu] >= data->trace_idx ||
	    (data->trace_head == data->trace_tail &&
	     data->trace_head_idx == data->trace_tail_idx))
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		return NULL;

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	if (!iter->next_page[cpu]) {
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		/* Initialize the iterator for this cpu trace buffer */
		WARN_ON(!data->trace_tail);
		page = virt_to_page(data->trace_tail);
		iter->next_page[cpu] = &page->lru;
		iter->next_page_idx[cpu] = data->trace_tail_idx;
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	}
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	page = list_entry(iter->next_page[cpu], struct page, lru);
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	BUG_ON(&data->trace_pages == &page->lru);

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	array = page_address(page);

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	WARN_ON(iter->next_page_idx[cpu] >= ENTRIES_PER_PAGE);
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	return &array[iter->next_page_idx[cpu]];
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}

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/* Increment the index counter of an iterator by one */
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static void __trace_iterator_increment(struct trace_iterator *iter, int cpu)
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{
	iter->next_idx[cpu]++;
	iter->next_page_idx[cpu]++;

	if (iter->next_page_idx[cpu] >= ENTRIES_PER_PAGE) {
		struct trace_array_cpu *data = iter->tr->data[cpu];

		iter->next_page_idx[cpu] = 0;
		iter->next_page[cpu] =
			trace_next_list(data, iter->next_page[cpu]);
	}
}

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static void trace_iterator_increment(struct trace_iterator *iter, int cpu)
{
	iter->idx++;
	__trace_iterator_increment(iter, cpu);
}

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static struct trace_entry *
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trace_entry_next(struct trace_array *tr, struct trace_array_cpu *data,
		 struct trace_iterator *iter, int cpu)
{
	struct list_head *next_page;
	struct trace_entry *ent;
	int idx, next_idx, next_page_idx;

	ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu);

	if (likely(!ent || ent->type != TRACE_CONT))
		return ent;

	/* save the iterator details */
	idx		= iter->idx;
	next_idx	= iter->next_idx[cpu];
	next_page_idx	= iter->next_page_idx[cpu];
	next_page	= iter->next_page[cpu];

	/* find a real entry */
	do {
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		__trace_iterator_increment(iter, cpu);
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		ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu);
	} while (ent && ent->type != TRACE_CONT);

	/* reset the iterator */
	iter->idx			= idx;
	iter->next_idx[cpu]		= next_idx;
	iter->next_page_idx[cpu]	= next_page_idx;
	iter->next_page[cpu]		= next_page;

	return ent;
}

static struct trace_entry *
__find_next_entry(struct trace_iterator *iter, int *ent_cpu, int inc)
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{
	struct trace_array *tr = iter->tr;
	struct trace_entry *ent, *next = NULL;
	int next_cpu = -1;
	int cpu;

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	for_each_tracing_cpu(cpu) {
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		if (!head_page(tr->data[cpu]))
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			continue;
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		ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu);
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		if (ent && ent->type == TRACE_CONT) {
			struct trace_array_cpu *data = tr->data[cpu];

			if (!inc)
				ent = trace_entry_next(tr, data, iter, cpu);
			else {
				while (ent && ent->type == TRACE_CONT) {
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					__trace_iterator_increment(iter, cpu);
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					ent = trace_entry_idx(tr, tr->data[cpu],
							      iter, cpu);
				}
			}
		}

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		/*
		 * Pick the entry with the smallest timestamp:
		 */
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		if (ent && (!next || ent->field.t < next->field.t)) {
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			next = ent;
			next_cpu = cpu;
		}
	}

	if (ent_cpu)
		*ent_cpu = next_cpu;

	return next;
}

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/* Find the next real entry, without updating the iterator itself */
static struct trace_entry *
find_next_entry(struct trace_iterator *iter, int *ent_cpu)
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{
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	return __find_next_entry(iter, ent_cpu, 0);
}

/* Find the next real entry, and increment the iterator to the next entry */
static void *find_next_entry_inc(struct trace_iterator *iter)
{
	struct trace_entry *next;
	int next_cpu = -1;
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	next = __find_next_entry(iter, &next_cpu, 1);
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	iter->prev_ent = iter->ent;
	iter->prev_cpu = iter->cpu;

	iter->ent = next;
	iter->cpu = next_cpu;

	if (next)
		trace_iterator_increment(iter, iter->cpu);

	return next ? iter : NULL;
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}
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static void trace_consume(struct trace_iterator *iter)
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{
	struct trace_array_cpu *data = iter->tr->data[iter->cpu];
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	struct trace_entry *ent;
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 again:
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	data->trace_tail_idx++;
	if (data->trace_tail_idx >= ENTRIES_PER_PAGE) {
		data->trace_tail = trace_next_page(data, data->trace_tail);
		data->trace_tail_idx = 0;
	}
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	/* Check if we empty it, then reset the index */
	if (data->trace_head == data->trace_tail &&
	    data->trace_head_idx == data->trace_tail_idx)
		data->trace_idx = 0;

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	ent = trace_entry_idx(iter->tr, iter->tr->data[iter->cpu],
			      iter, iter->cpu);
	if (ent && ent->type == TRACE_CONT)
		goto again;
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}

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static void *s_next(struct seq_file *m, void *v, loff_t *pos)
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{
	struct trace_iterator *iter = m->private;
	int i = (int)*pos;
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	void *ent;
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	(*pos)++;

	/* can't go backwards */
	if (iter->idx > i)
		return NULL;

	if (iter->idx < 0)
		ent = find_next_entry_inc(iter);
	else
		ent = iter;

	while (ent && iter->idx < i)
		ent = find_next_entry_inc(iter);

	iter->pos = *pos;

	return ent;
}

static void *s_start(struct seq_file *m, loff_t *pos)
{
	struct trace_iterator *iter = m->private;
	void *p = NULL;
	loff_t l = 0;
	int i;

	mutex_lock(&trace_types_lock);

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	if (!current_trace || current_trace != iter->trace) {
		mutex_unlock(&trace_types_lock);
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		return NULL;
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	}
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	atomic_inc(&trace_record_cmdline_disabled);

	/* let the tracer grab locks here if needed */
	if (current_trace->start)
		current_trace->start(iter);

	if (*pos != iter->pos) {
		iter->ent = NULL;
		iter->cpu = 0;
		iter->idx = -1;
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		iter->prev_ent = NULL;
		iter->prev_cpu = -1;
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		for_each_tracing_cpu(i) {
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			iter->next_idx[i] = 0;
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			iter->next_page[i] = NULL;
		}
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		for (p = iter; p && l < *pos; p = s_next(m, p, &l))
			;

	} else {
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		l = *pos - 1;
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		p = s_next(m, p, &l);
	}

	return p;
}

static void s_stop(struct seq_file *m, void *p)
{
	struct trace_iterator *iter = m->private;

	atomic_dec(&trace_record_cmdline_disabled);

	/* let the tracer release locks here if needed */
	if (current_trace && current_trace == iter->trace && iter->trace->stop)
		iter->trace->stop(iter);

	mutex_unlock(&trace_types_lock);
}

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#define KRETPROBE_MSG "[unknown/kretprobe'd]"

#ifdef CONFIG_KRETPROBES
static inline int kretprobed(unsigned long addr)
{
	return addr == (unsigned long)kretprobe_trampoline;
}
#else
static inline int kretprobed(unsigned long addr)
{
	return 0;
}
#endif /* CONFIG_KRETPROBES */

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static int
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seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
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{
#ifdef CONFIG_KALLSYMS
	char str[KSYM_SYMBOL_LEN];

	kallsyms_lookup(address, NULL, NULL, NULL, str);

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	return trace_seq_printf(s, fmt, str);
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#endif
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	return 1;
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}

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static int
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seq_print_sym_offset(struct trace_seq *s, const char *fmt,
		     unsigned long address)
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{
#ifdef CONFIG_KALLSYMS
	char str[KSYM_SYMBOL_LEN];

	sprint_symbol(str, address);
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	return trace_seq_printf(s, fmt, str);
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#endif
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	return 1;
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}

#ifndef CONFIG_64BIT
# define IP_FMT "%08lx"
#else
# define IP_FMT "%016lx"
#endif

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static int
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seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
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{
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	int ret;

	if (!ip)
		return trace_seq_printf(s, "0");
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	if (sym_flags & TRACE_ITER_SYM_OFFSET)
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		ret = seq_print_sym_offset(s, "%s", ip);
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	else
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		ret = seq_print_sym_short(s, "%s", ip);

	if (!ret)
		return 0;
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	if (sym_flags & TRACE_ITER_SYM_ADDR)
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		ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
	return ret;
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}

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static void print_lat_help_header(struct seq_file *m)
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{
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	seq_puts(m, "#                  _------=> CPU#            \n");
	seq_puts(m, "#                 / _-----=> irqs-off        \n");
	seq_puts(m, "#                | / _----=> need-resched    \n");
	seq_puts(m, "#                || / _---=> hardirq/softirq \n");
	seq_puts(m