[PATCH v6 2/6] tracing: Rename __dynamic_array() to __dynamic_field() for ftrace events

[Steven Rostedt <rostedt@kernel.org>]

From: Steven Rostedt <rostedt@goodmis.org>

The ftrace events (like function, trace_print, etc) are created somewhat
manually and not via the TRACE_EVENT() or tracepoint magic macros. It has
its own macros.

The dynamic fields used __dynamic_array() to be created, but the output is
different than the __dynamic_array() used by TRACE_EVENT().

The TRACE_EVENT() __dynamic_array() creates the field like:

	field:__data_loc u8[] v_data;   offset:120;     size:4; signed:0;

Whereas the ftrace event is created as:

	field:char buf[];       offset:12;      size:0; signed:0;

The difference is that the ftrace field is defined as the rest of the size
of the event saved in the ring buffer. TRACE_EVENT() doesn't have such a
dynamic field, and its version saves a word that holds the offset into the
event that the field is stored, as well as the size.

For consistency rename the ftrace event macro to __dynamic_field(). This
way the ftrace event can also include a __dynamic_array() later that works
the same as the TRACE_EVENT() dynamic array.

Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
---
 kernel/trace/trace.h         |  4 ++--
 kernel/trace/trace_entries.h | 10 +++++-----
 kernel/trace/trace_export.c  | 12 ++++++------
 3 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 5f4bed5842f9..0fd2559ff119 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -92,8 +92,8 @@ enum trace_type {
 #undef __array_desc
 #define __array_desc(type, container, item, size)
 
-#undef __dynamic_array
-#define __dynamic_array(type, item)	type	item[];
+#undef __dynamic_field
+#define __dynamic_field(type, item)	type	item[];
 
 #undef __rel_dynamic_array
 #define __rel_dynamic_array(type, item)	type	item[];
diff --git a/kernel/trace/trace_entries.h b/kernel/trace/trace_entries.h
index de294ae2c5c5..5cf80f6c704a 100644
--- a/kernel/trace/trace_entries.h
+++ b/kernel/trace/trace_entries.h
@@ -63,7 +63,7 @@ FTRACE_ENTRY_REG(function, ftrace_entry,
 	F_STRUCT(
 		__field_fn(	unsigned long,		ip		)
 		__field_fn(	unsigned long,		parent_ip	)
-		__dynamic_array( unsigned long,		args		)
+		__dynamic_field( unsigned long,		args		)
 	),
 
 	F_printk(" %ps <-- %ps",
@@ -81,7 +81,7 @@ FTRACE_ENTRY(funcgraph_entry, ftrace_graph_ent_entry,
 		__field_struct(	struct ftrace_graph_ent,	graph_ent	)
 		__field_packed(	unsigned long,	graph_ent,	func		)
 		__field_packed(	unsigned int,	graph_ent,	depth		)
-		__dynamic_array(unsigned long,	args				)
+		__dynamic_field(unsigned long,	args				)
 	),
 
 	F_printk("--> %ps (%u)", (void *)__entry->func, __entry->depth)
@@ -259,7 +259,7 @@ FTRACE_ENTRY(bprint, bprint_entry,
 	F_STRUCT(
 		__field(	unsigned long,	ip	)
 		__field(	const char *,	fmt	)
-		__dynamic_array(	u32,	buf	)
+		__dynamic_field(	u32,	buf	)
 	),
 
 	F_printk("%ps: %s",
@@ -272,7 +272,7 @@ FTRACE_ENTRY_REG(print, print_entry,
 
 	F_STRUCT(
 		__field(	unsigned long,	ip	)
-		__dynamic_array(	char,	buf	)
+		__dynamic_field(	char,	buf	)
 	),
 
 	F_printk("%ps: %s",
@@ -287,7 +287,7 @@ FTRACE_ENTRY(raw_data, raw_data_entry,
 
 	F_STRUCT(
 		__field(	unsigned int,	id	)
-		__dynamic_array(	char,	buf	)
+		__dynamic_field(	char,	buf	)
 	),
 
 	F_printk("id:%04x %08x",
diff --git a/kernel/trace/trace_export.c b/kernel/trace/trace_export.c
index 1698fc22afa0..d9d41e3ba379 100644
--- a/kernel/trace/trace_export.c
+++ b/kernel/trace/trace_export.c
@@ -57,8 +57,8 @@ static int ftrace_event_register(struct trace_event_call *call,
 #undef __array_desc
 #define __array_desc(type, container, item, size)	type item[size];
 
-#undef __dynamic_array
-#define __dynamic_array(type, item)			type item[];
+#undef __dynamic_field
+#define __dynamic_field(type, item)			type item[];
 
 #undef F_STRUCT
 #define F_STRUCT(args...)				args
@@ -123,8 +123,8 @@ static void __always_unused ____ftrace_check_##name(void)		\
 #undef __array_desc
 #define __array_desc(_type, _container, _item, _len) __array(_type, _item, _len)
 
-#undef __dynamic_array
-#define __dynamic_array(_type, _item) {					\
+#undef __dynamic_field
+#define __dynamic_field(_type, _item) {					\
 	.type = #_type "[]", .name = #_item,				\
 	.size = 0, .align = __alignof__(_type),				\
 	is_signed_type(_type), .filter_type = FILTER_OTHER },
@@ -161,8 +161,8 @@ static struct trace_event_fields ftrace_event_fields_##name[] = {	\
 #undef __array_desc
 #define __array_desc(type, container, item, len)
 
-#undef __dynamic_array
-#define __dynamic_array(type, item)
+#undef __dynamic_field
+#define __dynamic_field(type, item)
 
 #undef F_printk
 #define F_printk(fmt, args...) __stringify(fmt) ", "  __stringify(args)
-- 
2.50.1