ftrace: move enums to ftrace.h and make helper function global

picked from the mmiotracer patches to distangle the patch queues.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

kernel/trace/trace.c

@@ -37,7 +37,7 @@ unsigned long __read_mostly	tracing_thresh;
 
 static int tracing_disabled = 1;
 
-static long
+long
 ns2usecs(cycle_t nsec)
 {
 	nsec += 500;
@@ -96,18 +96,6 @@ unsigned long nsecs_to_usecs(unsigned long nsecs)
 	return nsecs / 1000;
 }
 
-enum trace_type {
-	__TRACE_FIRST_TYPE = 0,
-
-	TRACE_FN,
-	TRACE_CTX,
-	TRACE_WAKE,
-	TRACE_STACK,
-	TRACE_SPECIAL,
-
-	__TRACE_LAST_TYPE
-};
-
 enum trace_flag_type {
 	TRACE_FLAG_IRQS_OFF		= 0x01,
 	TRACE_FLAG_NEED_RESCHED		= 0x02,
@@ -190,7 +178,7 @@ void *head_page(struct trace_array_cpu *data)
 	return page_address(page);
 }
 
-static int
+int
 trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
 {
 	int len = (PAGE_SIZE - 1) - s->len;
@@ -205,7 +193,7 @@ trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
 	va_end(ap);
 
 	/* If we can't write it all, don't bother writing anything */
-	if (ret > len)
+	if (ret >= len)
 		return 0;
 
 	s->len += ret;
@@ -638,7 +626,7 @@ tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags)
 	pc = preempt_count();
 
 	entry->preempt_count	= pc & 0xff;
-	entry->pid		= tsk->pid;
+	entry->pid		= (tsk) ? tsk->pid : 0;
 	entry->t		= ftrace_now(raw_smp_processor_id());
 	entry->flags = (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) |
 		((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) |
@@ -1541,6 +1529,9 @@ static int trace_empty(struct trace_iterator *iter)
 
 static int print_trace_line(struct trace_iterator *iter)
 {
+	if (iter->trace && iter->trace->print_line)
+		return iter->trace->print_line(iter);
+
 	if (trace_flags & TRACE_ITER_BIN)
 		return print_bin_fmt(iter);
 
@@ -2162,6 +2153,7 @@ static int tracing_open_pipe(struct inode *inode, struct file *filp)
 		return -ENOMEM;
 
 	iter->tr = &global_trace;
+	iter->trace = current_trace;
 
 	filp->private_data = iter;
 

kernel/trace/trace.h

@@ -6,6 +6,18 @@
 #include <linux/sched.h>
 #include <linux/clocksource.h>
 
+enum trace_type {
+	__TRACE_FIRST_TYPE = 0,
+
+	TRACE_FN,
+	TRACE_CTX,
+	TRACE_WAKE,
+	TRACE_STACK,
+	TRACE_SPECIAL,
+
+	__TRACE_LAST_TYPE
+};
+
 /*
  * Function trace entry - function address and parent function addres:
  */
@@ -130,6 +142,7 @@ struct tracer {
 	int			(*selftest)(struct tracer *trace,
 					    struct trace_array *tr);
 #endif
+	int			(*print_line)(struct trace_iterator *iter);
 	struct tracer		*next;
 	int			print_max;
 };
@@ -276,6 +289,8 @@ extern int trace_selftest_startup_sched_switch(struct tracer *trace,
 #endif /* CONFIG_FTRACE_STARTUP_TEST */
 
 extern void *head_page(struct trace_array_cpu *data);
+extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...);
+extern long ns2usecs(cycle_t nsec);
 
 extern unsigned long trace_flags;