tracing: Move trace_flags from global to a trace_array field

In preparation to make trace options per instance, the global trace_flags
needs to be moved from being a global variable to a field within the trace
instance trace_array structure.

There's still more work to do, as there's some functions that use
trace_flags without passing in a way to get to the current_trace array. For
those, the global_trace is used directly (from trace.c). This includes
setting and clearing the trace_flags. This means that when a new instance is
created, it just gets the trace_flags of the global_trace and will not be
able to modify them. Depending on the functions that have access to the
trace_array, the flags of an instance may not affect parts of its trace,
where the global_trace is used. These will be fixed in future changes.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

kernel/trace/blktrace.c

@@ -1343,6 +1343,7 @@ static const struct {
 static enum print_line_t print_one_line(struct trace_iterator *iter,
 					bool classic)
 {
+	struct trace_array *tr = iter->tr;
 	struct trace_seq *s = &iter->seq;
 	const struct blk_io_trace *t;
 	u16 what;
@@ -1351,7 +1352,7 @@ static enum print_line_t print_one_line(struct trace_iterator *iter,
 
 	t	   = te_blk_io_trace(iter->ent);
 	what	   = t->action & ((1 << BLK_TC_SHIFT) - 1);
-	long_act   = !!(trace_flags & TRACE_ITER_VERBOSE);
+	long_act   = !!(tr->trace_flags & TRACE_ITER_VERBOSE);
 	log_action = classic ? &blk_log_action_classic : &blk_log_action;
 
 	if (t->action == BLK_TN_MESSAGE) {
@@ -1413,9 +1414,9 @@ blk_tracer_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
 	/* don't output context-info for blk_classic output */
 	if (bit == TRACE_BLK_OPT_CLASSIC) {
 		if (set)
-			trace_flags &= ~TRACE_ITER_CONTEXT_INFO;
+			tr->trace_flags &= ~TRACE_ITER_CONTEXT_INFO;
 		else
-			trace_flags |= TRACE_ITER_CONTEXT_INFO;
+			tr->trace_flags |= TRACE_ITER_CONTEXT_INFO;
 	}
 	return 0;
 }

kernel/trace/trace.c

@@ -250,6 +250,14 @@ unsigned long long ns2usecs(cycle_t nsec)
 	return nsec;
 }
 
+/* trace_flags holds trace_options default values */
+#define TRACE_DEFAULT_FLAGS						\
+	(FUNCTION_DEFAULT_FLAGS |					\
+	 TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK |			\
+	 TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO |		\
+	 TRACE_ITER_RECORD_CMD | TRACE_ITER_OVERWRITE |			\
+	 TRACE_ITER_IRQ_INFO | TRACE_ITER_MARKERS)
+
 /*
  * The global_trace is the descriptor that holds the tracing
  * buffers for the live tracing. For each CPU, it contains
@@ -262,7 +270,9 @@ unsigned long long ns2usecs(cycle_t nsec)
  * pages for the buffer for that CPU. Each CPU has the same number
  * of pages allocated for its buffer.
  */
-static struct trace_array	global_trace;
+static struct trace_array global_trace = {
+	.trace_flags = TRACE_DEFAULT_FLAGS,
+};
 
 LIST_HEAD(ftrace_trace_arrays);
 
@@ -490,15 +500,6 @@ static inline void ftrace_trace_stack(struct ring_buffer *buffer,
 
 #endif
 
-/* trace_flags holds trace_options default values */
-unsigned long trace_flags =
-	FUNCTION_DEFAULT_FLAGS |
-	TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK |
-	TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO |
-	TRACE_ITER_RECORD_CMD | TRACE_ITER_OVERWRITE |
-	TRACE_ITER_IRQ_INFO | TRACE_ITER_MARKERS
-	;
-
 static void tracer_tracing_on(struct trace_array *tr)
 {
 	if (tr->trace_buffer.buffer)
@@ -543,7 +544,7 @@ int __trace_puts(unsigned long ip, const char *str, int size)
 	int alloc;
 	int pc;
 
-	if (!(trace_flags & TRACE_ITER_PRINTK))
+	if (!(global_trace.trace_flags & TRACE_ITER_PRINTK))
 		return 0;
 
 	pc = preempt_count();
@@ -593,7 +594,7 @@ int __trace_bputs(unsigned long ip, const char *str)
 	int size = sizeof(struct bputs_entry);
 	int pc;
 
-	if (!(trace_flags & TRACE_ITER_PRINTK))
+	if (!(global_trace.trace_flags & TRACE_ITER_PRINTK))
 		return 0;
 
 	pc = preempt_count();
@@ -1875,7 +1876,7 @@ static inline void ftrace_trace_stack(struct ring_buffer *buffer,
 				      unsigned long flags,
 				      int skip, int pc, struct pt_regs *regs)
 {
-	if (!(trace_flags & TRACE_ITER_STACKTRACE))
+	if (!(global_trace.trace_flags & TRACE_ITER_STACKTRACE))
 		return;
 
 	__ftrace_trace_stack(buffer, flags, skip, pc, regs);
@@ -1919,7 +1920,7 @@ ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, int pc)
 	struct userstack_entry *entry;
 	struct stack_trace trace;
 
-	if (!(trace_flags & TRACE_ITER_USERSTACKTRACE))
+	if (!(global_trace.trace_flags & TRACE_ITER_USERSTACKTRACE))
 		return;
 
 	/*
@@ -2236,7 +2237,7 @@ int trace_array_printk(struct trace_array *tr,
 	int ret;
 	va_list ap;
 
-	if (!(trace_flags & TRACE_ITER_PRINTK))
+	if (!(global_trace.trace_flags & TRACE_ITER_PRINTK))
 		return 0;
 
 	va_start(ap, fmt);
@@ -2251,7 +2252,7 @@ int trace_array_printk_buf(struct ring_buffer *buffer,
 	int ret;
 	va_list ap;
 
-	if (!(trace_flags & TRACE_ITER_PRINTK))
+	if (!(global_trace.trace_flags & TRACE_ITER_PRINTK))
 		return 0;
 
 	va_start(ap, fmt);
@@ -2592,7 +2593,7 @@ static void print_func_help_header_irq(struct trace_buffer *buf, struct seq_file
 void
 print_trace_header(struct seq_file *m, struct trace_iterator *iter)
 {
-	unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
+	unsigned long sym_flags = (global_trace.trace_flags & TRACE_ITER_SYM_MASK);
 	struct trace_buffer *buf = iter->trace_buffer;
 	struct trace_array_cpu *data = per_cpu_ptr(buf->data, buf->cpu);
 	struct tracer *type = iter->trace;
@@ -2654,8 +2655,9 @@ print_trace_header(struct seq_file *m, struct trace_iterator *iter)
 static void test_cpu_buff_start(struct trace_iterator *iter)
 {
 	struct trace_seq *s = &iter->seq;
+	struct trace_array *tr = iter->tr;
 
-	if (!(trace_flags & TRACE_ITER_ANNOTATE))
+	if (!(tr->trace_flags & TRACE_ITER_ANNOTATE))
 		return;
 
 	if (!(iter->iter_flags & TRACE_FILE_ANNOTATE))
@@ -2677,8 +2679,9 @@ static void test_cpu_buff_start(struct trace_iterator *iter)
 
 static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
 {
+	struct trace_array *tr = iter->tr;
 	struct trace_seq *s = &iter->seq;
-	unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
+	unsigned long sym_flags = (tr->trace_flags & TRACE_ITER_SYM_MASK);
 	struct trace_entry *entry;
 	struct trace_event *event;
 
@@ -2688,7 +2691,7 @@ static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
 
 	event = ftrace_find_event(entry->type);
 
-	if (trace_flags & TRACE_ITER_CONTEXT_INFO) {
+	if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) {
 		if (iter->iter_flags & TRACE_FILE_LAT_FMT)
 			trace_print_lat_context(iter);
 		else
@@ -2708,13 +2711,14 @@ static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
 
 static enum print_line_t print_raw_fmt(struct trace_iterator *iter)
 {
+	struct trace_array *tr = iter->tr;
 	struct trace_seq *s = &iter->seq;
 	struct trace_entry *entry;
 	struct trace_event *event;
 
 	entry = iter->ent;
 
-	if (trace_flags & TRACE_ITER_CONTEXT_INFO)
+	if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO)
 		trace_seq_printf(s, "%d %d %llu ",
 				 entry->pid, iter->cpu, iter->ts);
 
@@ -2732,6 +2736,7 @@ static enum print_line_t print_raw_fmt(struct trace_iterator *iter)
 
 static enum print_line_t print_hex_fmt(struct trace_iterator *iter)
 {
+	struct trace_array *tr = iter->tr;
 	struct trace_seq *s = &iter->seq;
 	unsigned char newline = '\n';
 	struct trace_entry *entry;
@@ -2739,7 +2744,7 @@ static enum print_line_t print_hex_fmt(struct trace_iterator *iter)
 
 	entry = iter->ent;
 
-	if (trace_flags & TRACE_ITER_CONTEXT_INFO) {
+	if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) {
 		SEQ_PUT_HEX_FIELD(s, entry->pid);
 		SEQ_PUT_HEX_FIELD(s, iter->cpu);
 		SEQ_PUT_HEX_FIELD(s, iter->ts);
@@ -2761,13 +2766,14 @@ static enum print_line_t print_hex_fmt(struct trace_iterator *iter)
 
 static enum print_line_t print_bin_fmt(struct trace_iterator *iter)
 {
+	struct trace_array *tr = iter->tr;
 	struct trace_seq *s = &iter->seq;
 	struct trace_entry *entry;
 	struct trace_event *event;
 
 	entry = iter->ent;
 
-	if (trace_flags & TRACE_ITER_CONTEXT_INFO) {
+	if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) {
 		SEQ_PUT_FIELD(s, entry->pid);
 		SEQ_PUT_FIELD(s, iter->cpu);
 		SEQ_PUT_FIELD(s, iter->ts);
@@ -2816,6 +2822,8 @@ int trace_empty(struct trace_iterator *iter)
 /*  Called with trace_event_read_lock() held. */
 enum print_line_t print_trace_line(struct trace_iterator *iter)
 {
+	struct trace_array *tr = iter->tr;
+	unsigned long trace_flags = tr->trace_flags;
 	enum print_line_t ret;
 
 	if (iter->lost_events) {
@@ -2861,6 +2869,7 @@ enum print_line_t print_trace_line(struct trace_iterator *iter)
 void trace_latency_header(struct seq_file *m)
 {
 	struct trace_iterator *iter = m->private;
+	struct trace_array *tr = iter->tr;
 
 	/* print nothing if the buffers are empty */
 	if (trace_empty(iter))
@@ -2869,13 +2878,15 @@ void trace_latency_header(struct seq_file *m)
 	if (iter->iter_flags & TRACE_FILE_LAT_FMT)
 		print_trace_header(m, iter);
 
-	if (!(trace_flags & TRACE_ITER_VERBOSE))
+	if (!(tr->trace_flags & TRACE_ITER_VERBOSE))
 		print_lat_help_header(m);
 }
 
 void trace_default_header(struct seq_file *m)
 {
 	struct trace_iterator *iter = m->private;
+	struct trace_array *tr = iter->tr;
+	unsigned long trace_flags = tr->trace_flags;
 
 	if (!(trace_flags & TRACE_ITER_CONTEXT_INFO))
 		return;
@@ -3220,7 +3231,7 @@ static int tracing_open(struct inode *inode, struct file *file)
 		iter = __tracing_open(inode, file, false);
 		if (IS_ERR(iter))
 			ret = PTR_ERR(iter);
-		else if (trace_flags & TRACE_ITER_LATENCY_FMT)
+		else if (tr->trace_flags & TRACE_ITER_LATENCY_FMT)
 			iter->iter_flags |= TRACE_FILE_LAT_FMT;
 	}
 
@@ -3467,7 +3478,7 @@ static int tracing_trace_options_show(struct seq_file *m, void *v)
 	trace_opts = tr->current_trace->flags->opts;
 
 	for (i = 0; trace_options[i]; i++) {
-		if (trace_flags & (1 << i))
+		if (tr->trace_flags & (1 << i))
 			seq_printf(m, "%s\n", trace_options[i]);
 		else
 			seq_printf(m, "no%s\n", trace_options[i]);
@@ -3532,7 +3543,7 @@ int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set)
 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled)
 {
 	/* do nothing if flag is already set */
-	if (!!(trace_flags & mask) == !!enabled)
+	if (!!(tr->trace_flags & mask) == !!enabled)
 		return 0;
 
 	/* Give the tracer a chance to approve the change */
@@ -3541,9 +3552,9 @@ int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled)
 			return -EINVAL;
 
 	if (enabled)
-		trace_flags |= mask;
+		tr->trace_flags |= mask;
 	else
-		trace_flags &= ~mask;
+		tr->trace_flags &= ~mask;
 
 	if (mask == TRACE_ITER_RECORD_CMD)
 		trace_event_enable_cmd_record(enabled);
@@ -4558,7 +4569,7 @@ static int tracing_open_pipe(struct inode *inode, struct file *filp)
 	/* trace pipe does not show start of buffer */
 	cpumask_setall(iter->started);
 
-	if (trace_flags & TRACE_ITER_LATENCY_FMT)
+	if (tr->trace_flags & TRACE_ITER_LATENCY_FMT)
 		iter->iter_flags |= TRACE_FILE_LAT_FMT;
 
 	/* Output in nanoseconds only if we are using a clock in nanoseconds. */
@@ -4615,11 +4626,13 @@ static int tracing_release_pipe(struct inode *inode, struct file *file)
 static unsigned int
 trace_poll(struct trace_iterator *iter, struct file *filp, poll_table *poll_table)
 {
+	struct trace_array *tr = iter->tr;
+
 	/* Iterators are static, they should be filled or empty */
 	if (trace_buffer_iter(iter, iter->cpu_file))
 		return POLLIN | POLLRDNORM;
 
-	if (trace_flags & TRACE_ITER_BLOCK)
+	if (tr->trace_flags & TRACE_ITER_BLOCK)
 		/*
 		 * Always select as readable when in blocking mode
 		 */
@@ -5036,7 +5049,7 @@ tracing_free_buffer_release(struct inode *inode, struct file *filp)
 	struct trace_array *tr = inode->i_private;
 
 	/* disable tracing ? */
-	if (trace_flags & TRACE_ITER_STOP_ON_FREE)
+	if (tr->trace_flags & TRACE_ITER_STOP_ON_FREE)
 		tracer_tracing_off(tr);
 	/* resize the ring buffer to 0 */
 	tracing_resize_ring_buffer(tr, 0, RING_BUFFER_ALL_CPUS);
@@ -5069,7 +5082,7 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
 	if (tracing_disabled)
 		return -EINVAL;
 
-	if (!(trace_flags & TRACE_ITER_MARKERS))
+	if (!(tr->trace_flags & TRACE_ITER_MARKERS))
 		return -EINVAL;
 
 	if (cnt > TRACE_BUF_SIZE)
@@ -6180,7 +6193,7 @@ trace_options_core_read(struct file *filp, char __user *ubuf, size_t cnt,
 	long index = (long)filp->private_data;
 	char *buf;
 
-	if (trace_flags & (1 << index))
+	if (global_trace.trace_flags & (1 << index))
 		buf = "1\n";
 	else
 		buf = "0\n";
@@ -6407,7 +6420,7 @@ allocate_trace_buffer(struct trace_array *tr, struct trace_buffer *buf, int size
 {
 	enum ring_buffer_flags rb_flags;
 
-	rb_flags = trace_flags & TRACE_ITER_OVERWRITE ? RB_FL_OVERWRITE : 0;
+	rb_flags = tr->trace_flags & TRACE_ITER_OVERWRITE ? RB_FL_OVERWRITE : 0;
 
 	buf->tr = tr;
 
@@ -6502,6 +6515,8 @@ static int instance_mkdir(const char *name)
 	if (!alloc_cpumask_var(&tr->tracing_cpumask, GFP_KERNEL))
 		goto out_free_tr;
 
+	tr->trace_flags = global_trace.trace_flags;
+
 	cpumask_copy(tr->tracing_cpumask, cpu_all_mask);
 
 	raw_spin_lock_init(&tr->start_lock);
@@ -6938,6 +6953,7 @@ void ftrace_dump(enum ftrace_dump_mode oops_dump_mode)
 	/* use static because iter can be a bit big for the stack */
 	static struct trace_iterator iter;
 	static atomic_t dump_running;
+	struct trace_array *tr = &global_trace;
 	unsigned int old_userobj;
 	unsigned long flags;
 	int cnt = 0, cpu;
@@ -6967,10 +6983,10 @@ void ftrace_dump(enum ftrace_dump_mode oops_dump_mode)
 		atomic_inc(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled);
 	}
 
-	old_userobj = trace_flags & TRACE_ITER_SYM_USEROBJ;
+	old_userobj = tr->trace_flags & TRACE_ITER_SYM_USEROBJ;
 
 	/* don't look at user memory in panic mode */
-	trace_flags &= ~TRACE_ITER_SYM_USEROBJ;
+	tr->trace_flags &= ~TRACE_ITER_SYM_USEROBJ;
 
 	switch (oops_dump_mode) {
 	case DUMP_ALL:
@@ -7033,7 +7049,7 @@ void ftrace_dump(enum ftrace_dump_mode oops_dump_mode)
 		printk(KERN_TRACE "---------------------------------\n");
 
  out_enable:
-	trace_flags |= old_userobj;
+	tr->trace_flags |= old_userobj;
 
 	for_each_tracing_cpu(cpu) {
 		atomic_dec(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled);

kernel/trace/trace.h

@@ -217,6 +217,7 @@ struct trace_array {
 	int			stop_count;
 	int			clock_id;
 	struct tracer		*current_trace;
+	unsigned int		trace_flags;
 	unsigned int		flags;
 	raw_spinlock_t		start_lock;
 	struct dentry		*dir;
@@ -698,8 +699,6 @@ int trace_array_printk_buf(struct ring_buffer *buffer,
 void trace_printk_seq(struct trace_seq *s);
 enum print_line_t print_trace_line(struct trace_iterator *iter);
 
-extern unsigned long trace_flags;
-
 extern char trace_find_mark(unsigned long long duration);
 
 /* Standard output formatting function used for function return traces */
@@ -994,7 +993,7 @@ extern int enable_branch_tracing(struct trace_array *tr);
 extern void disable_branch_tracing(void);
 static inline int trace_branch_enable(struct trace_array *tr)
 {
-	if (trace_flags & TRACE_ITER_BRANCH)
+	if (tr->trace_flags & TRACE_ITER_BRANCH)
 		return enable_branch_tracing(tr);
 	return 0;
 }

kernel/trace/trace_events.c

@@ -338,6 +338,7 @@ static int __ftrace_event_enable_disable(struct trace_event_file *file,
 					 int enable, int soft_disable)
 {
 	struct trace_event_call *call = file->event_call;
+	struct trace_array *tr = file->tr;
 	int ret = 0;
 	int disable;
 
@@ -401,7 +402,7 @@ static int __ftrace_event_enable_disable(struct trace_event_file *file,
 			if (soft_disable)
 				set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags);
 
-			if (trace_flags & TRACE_ITER_RECORD_CMD) {
+			if (tr->trace_flags & TRACE_ITER_RECORD_CMD) {
 				tracing_start_cmdline_record();
 				set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags);
 			}

kernel/trace/trace_functions_graph.c

@@ -112,8 +112,8 @@ enum {
 };
 
 static void
-print_graph_duration(unsigned long long duration, struct trace_seq *s,
-		     u32 flags);
+print_graph_duration(struct trace_array *tr, unsigned long long duration,
+		     struct trace_seq *s, u32 flags);
 
 /* Add a function return address to the trace stack on thread info.*/
 int
@@ -658,6 +658,7 @@ static void
 print_graph_irq(struct trace_iterator *iter, unsigned long addr,
 		enum trace_type type, int cpu, pid_t pid, u32 flags)
 {
+	struct trace_array *tr = iter->tr;
 	struct trace_seq *s = &iter->seq;
 	struct trace_entry *ent = iter->ent;
 
@@ -665,7 +666,7 @@ print_graph_irq(struct trace_iterator *iter, unsigned long addr,
 		addr >= (unsigned long)__irqentry_text_end)
 		return;
 
-	if (trace_flags & TRACE_ITER_CONTEXT_INFO) {
+	if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) {
 		/* Absolute time */
 		if (flags & TRACE_GRAPH_PRINT_ABS_TIME)
 			print_graph_abs_time(iter->ts, s);
@@ -681,19 +682,19 @@ print_graph_irq(struct trace_iterator *iter, unsigned long addr,
 		}
 
 		/* Latency format */
-		if (trace_flags & TRACE_ITER_LATENCY_FMT)
+		if (tr->trace_flags & TRACE_ITER_LATENCY_FMT)
 			print_graph_lat_fmt(s, ent);
 	}
 
 	/* No overhead */
-	print_graph_duration(0, s, flags | FLAGS_FILL_START);
+	print_graph_duration(tr, 0, s, flags | FLAGS_FILL_START);
 
 	if (type == TRACE_GRAPH_ENT)
 		trace_seq_puts(s, "==========>");
 	else
 		trace_seq_puts(s, "<==========");
 
-	print_graph_duration(0, s, flags | FLAGS_FILL_END);
+	print_graph_duration(tr, 0, s, flags | FLAGS_FILL_END);
 	trace_seq_putc(s, '\n');
 }
 
@@ -731,11 +732,11 @@ trace_print_graph_duration(unsigned long long duration, struct trace_seq *s)
 }
 
 static void
-print_graph_duration(unsigned long long duration, struct trace_seq *s,
-		     u32 flags)
+print_graph_duration(struct trace_array *tr, unsigned long long duration,
+		     struct trace_seq *s, u32 flags)
 {
 	if (!(flags & TRACE_GRAPH_PRINT_DURATION) ||
-	    !(trace_flags & TRACE_ITER_CONTEXT_INFO))
+	    !(tr->trace_flags & TRACE_ITER_CONTEXT_INFO))
 		return;
 
 	/* No real adata, just filling the column with spaces */
@@ -769,6 +770,7 @@ print_graph_entry_leaf(struct trace_iterator *iter,
 		struct trace_seq *s, u32 flags)
 {
 	struct fgraph_data *data = iter->private;
+	struct trace_array *tr = iter->tr;
 	struct ftrace_graph_ret *graph_ret;
 	struct ftrace_graph_ent *call;
 	unsigned long long duration;
@@ -797,7 +799,7 @@ print_graph_entry_leaf(struct trace_iterator *iter,
 	}
 
 	/* Overhead and duration */
-	print_graph_duration(duration, s, flags);
+	print_graph_duration(tr, duration, s, flags);
 
 	/* Function */
 	for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++)
@@ -815,6 +817,7 @@ print_graph_entry_nested(struct trace_iterator *iter,
 {
 	struct ftrace_graph_ent *call = &entry->graph_ent;
 	struct fgraph_data *data = iter->private;
+	struct trace_array *tr = iter->tr;
 	int i;
 
 	if (data) {
@@ -830,7 +833,7 @@ print_graph_entry_nested(struct trace_iterator *iter,
 	}
 
 	/* No time */
-	print_graph_duration(0, s, flags | FLAGS_FILL_FULL);
+	print_graph_duration(tr, 0, s, flags | FLAGS_FILL_FULL);
 
 	/* Function */
 	for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++)
@@ -854,6 +857,7 @@ print_graph_prologue(struct trace_iterator *iter, struct trace_seq *s,
 {
 	struct fgraph_data *data = iter->private;
 	struct trace_entry *ent = iter->ent;
+	struct trace_array *tr = iter->tr;
 	int cpu = iter->cpu;
 
 	/* Pid */
@@ -863,7 +867,7 @@ print_graph_prologue(struct trace_iterator *iter, struct trace_seq *s,
 		/* Interrupt */
 		print_graph_irq(iter, addr, type, cpu, ent->pid, flags);
 
-	if (!(trace_flags & TRACE_ITER_CONTEXT_INFO))
+	if (!(tr->trace_flags & TRACE_ITER_CONTEXT_INFO))
 		return;
 
 	/* Absolute time */
@@ -881,7 +885,7 @@ print_graph_prologue(struct trace_iterator *iter, struct trace_seq *s,
 	}
 
 	/* Latency format */
-	if (trace_flags & TRACE_ITER_LATENCY_FMT)
+	if (tr->trace_flags & TRACE_ITER_LATENCY_FMT)
 		print_graph_lat_fmt(s, ent);
 
 	return;
@@ -1032,6 +1036,7 @@ print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
 {
 	unsigned long long duration = trace->rettime - trace->calltime;
 	struct fgraph_data *data = iter->private;
+	struct trace_array *tr = iter->tr;
 	pid_t pid = ent->pid;
 	int cpu = iter->cpu;
 	int func_match = 1;
@@ -1063,7 +1068,7 @@ print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
 	print_graph_prologue(iter, s, 0, 0, flags);
 
 	/* Overhead and duration */
-	print_graph_duration(duration, s, flags);
+	print_graph_duration(tr, duration, s, flags);
 
 	/* Closing brace */
 	for (i = 0; i < trace->depth * TRACE_GRAPH_INDENT; i++)
@@ -1096,7 +1101,8 @@ static enum print_line_t
 print_graph_comment(struct trace_seq *s, struct trace_entry *ent,
 		    struct trace_iterator *iter, u32 flags)
 {
-	unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
+	struct trace_array *tr = iter->tr;
+	unsigned long sym_flags = (tr->trace_flags & TRACE_ITER_SYM_MASK);
 	struct fgraph_data *data = iter->private;
 	struct trace_event *event;
 	int depth = 0;
@@ -1109,7 +1115,7 @@ print_graph_comment(struct trace_seq *s, struct trace_entry *ent,
 	print_graph_prologue(iter, s, 0, 0, flags);
 
 	/* No time */
-	print_graph_duration(0, s, flags | FLAGS_FILL_FULL);
+	print_graph_duration(tr, 0, s, flags | FLAGS_FILL_FULL);
 
 	/* Indentation */
 	if (depth > 0)
@@ -1250,9 +1256,10 @@ static void print_lat_header(struct seq_file *s, u32 flags)
 	seq_printf(s, "#%.*s||| /                      \n", size, spaces);
 }
 
-static void __print_graph_headers_flags(struct seq_file *s, u32 flags)
+static void __print_graph_headers_flags(struct trace_array *tr,
+					struct seq_file *s, u32 flags)
 {
-	int lat = trace_flags & TRACE_ITER_LATENCY_FMT;
+	int lat = tr->trace_flags & TRACE_ITER_LATENCY_FMT;
 
 	if (lat)
 		print_lat_header(s, flags);
@@ -1294,11 +1301,12 @@ static void print_graph_headers(struct seq_file *s)
 void print_graph_headers_flags(struct seq_file *s, u32 flags)
 {
 	struct trace_iterator *iter = s->private;
+	struct trace_array *tr = iter->tr;
 
-	if (!(trace_flags & TRACE_ITER_CONTEXT_INFO))
+	if (!(tr->trace_flags & TRACE_ITER_CONTEXT_INFO))
 		return;
 
-	if (trace_flags & TRACE_ITER_LATENCY_FMT) {
+	if (tr->trace_flags & TRACE_ITER_LATENCY_FMT) {
 		/* print nothing if the buffers are empty */
 		if (trace_empty(iter))
 			return;
@@ -1306,7 +1314,7 @@ void print_graph_headers_flags(struct seq_file *s, u32 flags)
 		print_trace_header(s, iter);
 	}
 
-	__print_graph_headers_flags(s, flags);
+	__print_graph_headers_flags(tr, s, flags);
 }
 
 void graph_trace_open(struct trace_iterator *iter)

kernel/trace/trace_irqsoff.c

@@ -58,13 +58,13 @@ irq_trace(void)
 
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 static int irqsoff_display_graph(struct trace_array *tr, int set);
-# define is_graph() (trace_flags & TRACE_ITER_DISPLAY_GRAPH)
+# define is_graph(tr) ((tr)->trace_flags & TRACE_ITER_DISPLAY_GRAPH)
 #else
 static inline int irqsoff_display_graph(struct trace_array *tr, int set)
 {
 	return -EINVAL;
 }
-# define is_graph() false
+# define is_graph(tr) false
 #endif
 
 /*
@@ -149,7 +149,7 @@ static int irqsoff_display_graph(struct trace_array *tr, int set)
 {
 	int cpu;
 
-	if (!(is_graph() ^ set))
+	if (!(is_graph(tr) ^ set))
 		return 0;
 
 	stop_irqsoff_tracer(irqsoff_trace, !set);
@@ -198,7 +198,7 @@ static void irqsoff_graph_return(struct ftrace_graph_ret *trace)
 
 static void irqsoff_trace_open(struct trace_iterator *iter)
 {
-	if (is_graph())
+	if (is_graph(iter->tr))
 		graph_trace_open(iter);
 
 }
@@ -220,7 +220,7 @@ static enum print_line_t irqsoff_print_line(struct trace_iterator *iter)
 	 * In graph mode call the graph tracer output function,
 	 * otherwise go with the TRACE_FN event handler
 	 */
-	if (is_graph())
+	if (is_graph(iter->tr))
 		return print_graph_function_flags(iter, GRAPH_TRACER_FLAGS);
 
 	return TRACE_TYPE_UNHANDLED;
@@ -228,7 +228,9 @@ static enum print_line_t irqsoff_print_line(struct trace_iterator *iter)
 
 static void irqsoff_print_header(struct seq_file *s)
 {
-	if (is_graph())
+	struct trace_array *tr = irqsoff_trace;
+
+	if (is_graph(tr))
 		print_graph_headers_flags(s, GRAPH_TRACER_FLAGS);
 	else
 		trace_default_header(s);
@@ -239,7 +241,7 @@ __trace_function(struct trace_array *tr,
 		 unsigned long ip, unsigned long parent_ip,
 		 unsigned long flags, int pc)
 {
-	if (is_graph())
+	if (is_graph(tr))
 		trace_graph_function(tr, ip, parent_ip, flags, pc);
 	else
 		trace_function(tr, ip, parent_ip, flags, pc);
@@ -516,7 +518,7 @@ static int register_irqsoff_function(struct trace_array *tr, int graph, int set)
 	int ret;
 
 	/* 'set' is set if TRACE_ITER_FUNCTION is about to be set */
-	if (function_enabled || (!set && !(trace_flags & TRACE_ITER_FUNCTION)))
+	if (function_enabled || (!set && !(tr->trace_flags & TRACE_ITER_FUNCTION)))
 		return 0;
 
 	if (graph)
@@ -550,9 +552,9 @@ static int irqsoff_function_set(struct trace_array *tr, u32 mask, int set)
 		return 0;
 
 	if (set)
-		register_irqsoff_function(tr, is_graph(), 1);
+		register_irqsoff_function(tr, is_graph(tr), 1);
 	else
-		unregister_irqsoff_function(tr, is_graph());
+		unregister_irqsoff_function(tr, is_graph(tr));
 	return 1;
 }
 #else
@@ -610,7 +612,7 @@ static int __irqsoff_tracer_init(struct trace_array *tr)
 	if (irqsoff_busy)
 		return -EBUSY;
 
-	save_flags = trace_flags;
+	save_flags = tr->trace_flags;
 
 	/* non overwrite screws up the latency tracers */
 	set_tracer_flag(tr, TRACE_ITER_OVERWRITE, 1);
@@ -626,7 +628,7 @@ static int __irqsoff_tracer_init(struct trace_array *tr)
 
 	/* Only toplevel instance supports graph tracing */
 	if (start_irqsoff_tracer(tr, (tr->flags & TRACE_ARRAY_FL_GLOBAL &&
-				      is_graph())))
+				      is_graph(tr))))
 		printk(KERN_ERR "failed to start irqsoff tracer\n");
 
 	irqsoff_busy = true;
@@ -638,7 +640,7 @@ static void irqsoff_tracer_reset(struct trace_array *tr)
 	int lat_flag = save_flags & TRACE_ITER_LATENCY_FMT;
 	int overwrite_flag = save_flags & TRACE_ITER_OVERWRITE;
 
-	stop_irqsoff_tracer(tr, is_graph());
+	stop_irqsoff_tracer(tr, is_graph(tr));
 
 	set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, lat_flag);
 	set_tracer_flag(tr, TRACE_ITER_OVERWRITE, overwrite_flag);

kernel/trace/trace_kdb.c

@@ -21,20 +21,22 @@ static void ftrace_dump_buf(int skip_lines, long cpu_file)
 	/* use static because iter can be a bit big for the stack */
 	static struct trace_iterator iter;
 	static struct ring_buffer_iter *buffer_iter[CONFIG_NR_CPUS];
+	struct trace_array *tr;
 	unsigned int old_userobj;
 	int cnt = 0, cpu;
 
 	trace_init_global_iter(&iter);
 	iter.buffer_iter = buffer_iter;
+	tr = iter.tr;
 
 	for_each_tracing_cpu(cpu) {
 		atomic_inc(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled);
 	}
 
-	old_userobj = trace_flags;
+	old_userobj = tr->trace_flags;
 
 	/* don't look at user memory in panic mode */
-	trace_flags &= ~TRACE_ITER_SYM_USEROBJ;
+	tr->trace_flags &= ~TRACE_ITER_SYM_USEROBJ;
 
 	kdb_printf("Dumping ftrace buffer:\n");
 
@@ -82,7 +84,7 @@ static void ftrace_dump_buf(int skip_lines, long cpu_file)
 		kdb_printf("---------------------------------\n");
 
 out:
-	trace_flags = old_userobj;
+	tr->trace_flags = old_userobj;
 
 	for_each_tracing_cpu(cpu) {
 		atomic_dec(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled);

kernel/trace/trace_output.c

@@ -476,7 +476,8 @@ char trace_find_mark(unsigned long long d)
 static int
 lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
 {
-	unsigned long verbose = trace_flags & TRACE_ITER_VERBOSE;
+	struct trace_array *tr = iter->tr;
+	unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
 	unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
 	unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
 	unsigned long long rel_ts = next_ts - iter->ts;
@@ -519,6 +520,7 @@ lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
 
 int trace_print_context(struct trace_iterator *iter)
 {
+	struct trace_array *tr = iter->tr;
 	struct trace_seq *s = &iter->seq;
 	struct trace_entry *entry = iter->ent;
 	unsigned long long t;
@@ -530,7 +532,7 @@ int trace_print_context(struct trace_iterator *iter)
 	trace_seq_printf(s, "%16s-%-5d [%03d] ",
 			       comm, entry->pid, iter->cpu);
 
-	if (trace_flags & TRACE_ITER_IRQ_INFO)
+	if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
 		trace_print_lat_fmt(s, entry);
 
 	if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
@@ -546,14 +548,15 @@ int trace_print_context(struct trace_iterator *iter)
 
 int trace_print_lat_context(struct trace_iterator *iter)
 {
-	u64 next_ts;
+	struct trace_array *tr = iter->tr;
 	/* trace_find_next_entry will reset ent_size */
 	int ent_size = iter->ent_size;
 	struct trace_seq *s = &iter->seq;
+	u64 next_ts;
 	struct trace_entry *entry = iter->ent,
 			   *next_entry = trace_find_next_entry(iter, NULL,
 							       &next_ts);
-	unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
+	unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
 
 	/* Restore the original ent_size */
 	iter->ent_size = ent_size;
@@ -1035,6 +1038,7 @@ static struct trace_event trace_stack_event = {
 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
 						int flags, struct trace_event *event)
 {
+	struct trace_array *tr = iter->tr;
 	struct userstack_entry *field;
 	struct trace_seq *s = &iter->seq;
 	struct mm_struct *mm = NULL;
@@ -1044,7 +1048,7 @@ static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
 
 	trace_seq_puts(s, "<user stack trace>\n");
 
-	if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
+	if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
 		struct task_struct *task;
 		/*
 		 * we do the lookup on the thread group leader,

kernel/trace/trace_sched_wakeup.c

@@ -39,13 +39,13 @@ static int save_flags;
 
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 static int wakeup_display_graph(struct trace_array *tr, int set);
-# define is_graph() (trace_flags & TRACE_ITER_DISPLAY_GRAPH)
+# define is_graph(tr) ((tr)->trace_flags & TRACE_ITER_DISPLAY_GRAPH)
 #else
 static inline int wakeup_display_graph(struct trace_array *tr, int set)
 {
 	return 0;
 }
-# define is_graph() false
+# define is_graph(tr) false
 #endif
 
 
@@ -131,7 +131,7 @@ static int register_wakeup_function(struct trace_array *tr, int graph, int set)
 	int ret;
 
 	/* 'set' is set if TRACE_ITER_FUNCTION is about to be set */
-	if (function_enabled || (!set && !(trace_flags & TRACE_ITER_FUNCTION)))
+	if (function_enabled || (!set && !(tr->trace_flags & TRACE_ITER_FUNCTION)))
 		return 0;
 
 	if (graph)
@@ -165,9 +165,9 @@ static int wakeup_function_set(struct trace_array *tr, u32 mask, int set)
 		return 0;
 
 	if (set)
-		register_wakeup_function(tr, is_graph(), 1);
+		register_wakeup_function(tr, is_graph(tr), 1);
 	else
-		unregister_wakeup_function(tr, is_graph());
+		unregister_wakeup_function(tr, is_graph(tr));
 	return 1;
 }
 #else
@@ -221,7 +221,7 @@ static void stop_func_tracer(struct trace_array *tr, int graph)
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 static int wakeup_display_graph(struct trace_array *tr, int set)
 {
-	if (!(is_graph() ^ set))
+	if (!(is_graph(tr) ^ set))
 		return 0;
 
 	stop_func_tracer(tr, !set);
@@ -270,7 +270,7 @@ static void wakeup_graph_return(struct ftrace_graph_ret *trace)
 
 static void wakeup_trace_open(struct trace_iterator *iter)
 {
-	if (is_graph())
+	if (is_graph(iter->tr))
 		graph_trace_open(iter);
 }
 
@@ -290,7 +290,7 @@ static enum print_line_t wakeup_print_line(struct trace_iterator *iter)
 	 * In graph mode call the graph tracer output function,
 	 * otherwise go with the TRACE_FN event handler
 	 */
-	if (is_graph())
+	if (is_graph(iter->tr))
 		return print_graph_function_flags(iter, GRAPH_TRACER_FLAGS);
 
 	return TRACE_TYPE_UNHANDLED;
@@ -298,7 +298,7 @@ static enum print_line_t wakeup_print_line(struct trace_iterator *iter)
 
 static void wakeup_print_header(struct seq_file *s)
 {
-	if (is_graph())
+	if (is_graph(wakeup_trace))
 		print_graph_headers_flags(s, GRAPH_TRACER_FLAGS);
 	else
 		trace_default_header(s);
@@ -309,7 +309,7 @@ __trace_function(struct trace_array *tr,
 		 unsigned long ip, unsigned long parent_ip,
 		 unsigned long flags, int pc)
 {
-	if (is_graph())
+	if (is_graph(tr))
 		trace_graph_function(tr, ip, parent_ip, flags, pc);
 	else
 		trace_function(tr, ip, parent_ip, flags, pc);
@@ -639,7 +639,7 @@ static void start_wakeup_tracer(struct trace_array *tr)
 	 */
 	smp_wmb();
 
-	if (start_func_tracer(tr, is_graph()))
+	if (start_func_tracer(tr, is_graph(tr)))
 		printk(KERN_ERR "failed to start wakeup tracer\n");
 
 	return;
@@ -652,7 +652,7 @@ fail_deprobe:
 static void stop_wakeup_tracer(struct trace_array *tr)
 {
 	tracer_enabled = 0;
-	stop_func_tracer(tr, is_graph());
+	stop_func_tracer(tr, is_graph(tr));
 	unregister_trace_sched_switch(probe_wakeup_sched_switch, NULL);
 	unregister_trace_sched_wakeup_new(probe_wakeup, NULL);
 	unregister_trace_sched_wakeup(probe_wakeup, NULL);
@@ -663,7 +663,7 @@ static bool wakeup_busy;
 
 static int __wakeup_tracer_init(struct trace_array *tr)
 {
-	save_flags = trace_flags;
+	save_flags = tr->trace_flags;
 
 	/* non overwrite screws up the latency tracers */
 	set_tracer_flag(tr, TRACE_ITER_OVERWRITE, 1);

kernel/trace/trace_syscalls.c

@@ -110,6 +110,7 @@ static enum print_line_t
 print_syscall_enter(struct trace_iterator *iter, int flags,
 		    struct trace_event *event)
 {
+	struct trace_array *tr = iter->tr;
 	struct trace_seq *s = &iter->seq;
 	struct trace_entry *ent = iter->ent;
 	struct syscall_trace_enter *trace;
@@ -136,7 +137,7 @@ print_syscall_enter(struct trace_iterator *iter, int flags,
 			goto end;
 
 		/* parameter types */
-		if (trace_flags & TRACE_ITER_VERBOSE)
+		if (tr->trace_flags & TRACE_ITER_VERBOSE)
 			trace_seq_printf(s, "%s ", entry->types[i]);
 
 		/* parameter values */