tracing: Extract duplicate ftrace_raw_init_event_foo()

Use a generic trace_event_raw_init() function for all event's raw_init
callbacks (but kprobes) instead of defining the same version for each
of these.
This shrinks the kernel code:

   text    data     bss     dec     hex filename
5355293 1961928 7103260 14420481         dc0a01 vmlinux.o.old
5346802 1961864 7103260 14411926         dbe896 vmlinux.o

raw_init can't be removed, because ftrace events and kprobe events
use different raw_init callbacks. Though it's possible to totally
remove raw_init, I choose to leave it as it is for now.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
LKML-Reference: <4B1DC48C.7080603@cn.fujitsu.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>

2 files changed, 3 insertions, 2 deletions

diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index 38f8d6553831..ea44b8911094 100644
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -158,6 +158,7 @@ enum {
         FILTER_PTR_STRING,
 };
 
+extern int trace_event_raw_init(struct ftrace_event_call *call);
 extern int trace_define_common_fields(struct ftrace_event_call *call);
 extern int trace_define_field(struct ftrace_event_call *call, const char *type,
                               const char *name, int offset, int size,
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index bc70c5810fec..94ac28437bef 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -145,7 +145,7 @@ struct perf_event_attr;
                 .name                   = "sys_enter"#sname,            \
                 .system                 = "syscalls",                   \
                 .event                  = &enter_syscall_print_##sname, \
-                .raw_init               = init_syscall_trace,           \
+                .raw_init               = trace_event_raw_init,         \
                 .show_format            = syscall_enter_format,         \
                 .define_fields          = syscall_enter_define_fields,  \
                 .regfunc                = reg_event_syscall_enter,      \
@@ -167,7 +167,7 @@ struct perf_event_attr;
                 .name                   = "sys_exit"#sname,             \
                 .system                 = "syscalls",                   \
                 .event                  = &exit_syscall_print_##sname,  \
-                .raw_init               = init_syscall_trace,           \
+                .raw_init               = trace_event_raw_init,         \
                 .show_format            = syscall_exit_format,          \
                 .define_fields          = syscall_exit_define_fields,   \
                 .regfunc                = reg_event_syscall_exit,       \