<commit_before>/*
 * Copyright (C) 2008 <NAME> <<EMAIL>>
 *
 */
#include <linux/stacktrace.h>
#include <linux/kallsyms.h>
#include <linux/seq_file.h>
#include <linux/spinlock.h>
#include <linux/uaccess.h>
#include <linux/debugfs.h>
#include <linux/ftrace.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/fs.h>
#include "trace.h"

#define STACK_TRACE_ENTRIES 500

static unsigned long stack_dump_trace[STACK_TRACE_ENTRIES+1] =
	 { [0 ... (STACK_TRACE_ENTRIES)] = ULONG_MAX };
static unsigned stack_dump_index[STACK_TRACE_ENTRIES];

static struct stack_trace max_stack_trace = {
	.max_entries		= STACK_TRACE_ENTRIES,
	.entries		= stack_dump_trace,
};

static unsigned long max_stack_size;
static raw_spinlock_t max_stack_lock =
	(raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;

static int stack_trace_disabled __read_mostly;
static DEFINE_PER_CPU(int, trace_active);

static inline void check_stack(void)
{
	unsigned long this_size, flags;
	unsigned long *p, *top, *start;
	int i;

	this_size = ((unsigned long)&this_size) & (THREAD_SIZE-1);
	this_size = THREAD_SIZE - this_size;

	if (this_size <= max_stack_size)
		return;

	raw_local_irq_save(flags);
	__raw_spin_lock(&max_stack_lock);

	/* a race could have already updated it */
	if (this_size <= max_stack_size)
		goto out;

	max_stack_size = this_size;

	max_stack_trace.nr_entries	= 0;
	max_stack_trace.skip		= 3;

	save_stack_trace(&max_stack_trace);
<commit_msg>ftrace: stack tracer only record when on stack<commit_after>/*
 * Copyright (C) 2008 <NAME> <<EMAIL>>
 *
 */
#include <linux/stacktrace.h>
#include <linux/kallsyms.h>
#include <linux/seq_file.h>
#include <linux/spinlock.h>
#include <linux/uaccess.h>
#include <linux/debugfs.h>
#include <linux/ftrace.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/fs.h>
#include "trace.h"

#define STACK_TRACE_ENTRIES 500

static unsigned long stack_dump_trace[STACK_TRACE_ENTRIES+1] =
	 { [0 ... (STACK_TRACE_ENTRIES)] = ULONG_MAX };
static unsigned stack_dump_index[STACK_TRACE_ENTRIES];

static struct stack_trace max_stack_trace = {
	.max_entries		= STACK_TRACE_ENTRIES,
	.entries		= stack_dump_trace,
};

static unsigned long max_stack_size;
static raw_spinlock_t max_stack_lock =
	(raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;

static int stack_trace_disabled __read_mostly;
static DEFINE_PER_CPU(int, trace_active);

static inline void check_stack(void)
{
	unsigned long this_size, flags;
	unsigned long *p, *top, *start;
	int i;

	this_size = ((unsigned long)&this_size) & (THREAD_SIZE-1);
	this_size = THREAD_SIZE - this_size;

	if (this_size <= max_stack_size)
		return;

	/* we do not handle interrupt stacks yet */
	if (!object_is_on_stack(&this_size))
		return;

	raw_local_irq_save(flags);
	__raw_spin_lock(&max_stack_lock);

	/* a race could have already updated it */
	if (this_size <= max_stack_size)
		goto out;

	max_stack_size = this_size;

	max_stack_trace.nr_entries	= 0;
	max_stack_trace.skip		= 3;

	save_stack_trace(&max_stack_trace);

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