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tracing/events: Add trace_define_common_fields()

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Extract duplicate code. Also prepare for the later patch.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4A8BAFB8.1010304@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Li Zefan 2009-08-19 15:54:32 +08:00 committed by Ingo Molnar
parent 14be96c971
commit e647d6b314
4 changed files with 29 additions and 17 deletions
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8
include/linux/ftrace_event.h
View file

@ -142,6 +142,7 @@ extern int filter_current_check_discard(struct ftrace_event_call *call,
extern int trace_define_field(struct ftrace_event_call *call, char *type,
char *name, int offset, int size, int is_signed);
extern int trace_define_common_fields(struct ftrace_event_call *call);
#define is_signed_type(type) (((type)(-1)) < 0)
@ -166,11 +167,4 @@ do { \
__trace_printk(ip, fmt, ##args); \
} while (0)
#define __common_field(type, item, is_signed) \
ret = trace_define_field(event_call, #type, "common_" #item, \
offsetof(typeof(field.ent), item), \
sizeof(field.ent.item), is_signed); \
if (ret) \
return ret;
#endif /* _LINUX_FTRACE_EVENT_H */

8
include/trace/ftrace.h
View file

@ -299,11 +299,9 @@ ftrace_define_fields_##call(struct ftrace_event_call *event_call) \
struct ftrace_raw_##call field; \
int ret; \
\
__common_field(int, type, 1); \
__common_field(unsigned char, flags, 0); \
__common_field(unsigned char, preempt_count, 0); \
__common_field(int, pid, 1); \
__common_field(int, tgid, 1); \
ret = trace_define_common_fields(event_call); \
if (ret) \
return ret; \
\
tstruct; \
\

22
kernel/trace/trace_events.c
View file

@ -62,6 +62,28 @@ int trace_define_field(struct ftrace_event_call *call, char *type,
}
EXPORT_SYMBOL_GPL(trace_define_field);
#define __common_field(type, item) \
ret = trace_define_field(call, #type, "common_" #item, \
offsetof(typeof(ent), item), \
sizeof(ent.item), \
is_signed_type(type)); \
if (ret) \
return ret;
int trace_define_common_fields(struct ftrace_event_call *call)
{
int ret;
struct trace_entry ent;
__common_field(unsigned short, type);
__common_field(unsigned char, flags);
__common_field(unsigned char, preempt_count);
__common_field(int, pid);
__common_field(int, tgid);
return ret;
}
#ifdef CONFIG_MODULES
static void trace_destroy_fields(struct ftrace_event_call *call)

8
kernel/trace/trace_export.c
View file

@ -189,11 +189,9 @@ ftrace_define_fields_##call(struct ftrace_event_call *event_call) \
struct args field; \
int ret; \
\
__common_field(unsigned char, type, 0); \
__common_field(unsigned char, flags, 0); \
__common_field(unsigned char, preempt_count, 0); \
__common_field(int, pid, 1); \
__common_field(int, tgid, 1); \
ret = trace_define_common_fields(event_call); \
if (ret) \
return ret; \
\
tstruct; \
\