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Subject[PATCH 5/7] trace_syscalls: remove duplicate init_enter_##sname()

use only one init_syscall_trace instead of
many init_enter_##sname()/init_exit_##sname()

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
---
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 3c280d7..cf0d923 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -158,19 +158,6 @@ static void prof_sysexit_disable_##sname(struct ftrace_event_call *unused) \
struct trace_event enter_syscall_print_##sname = { \
.trace = print_syscall_enter, \
}; \
- static int init_enter_##sname(struct ftrace_event_call *call) \
- { \
- int num, id; \
- num = __syscall_meta_##sname.syscall_nr; \
- if (num < 0) \
- return -ENOSYS; \
- id = register_ftrace_event(&enter_syscall_print_##sname);\
- if (!id) \
- return -ENODEV; \
- event_enter_##sname.id = id; \
- INIT_LIST_HEAD(&event_enter_##sname.fields); \
- return 0; \
- } \
TRACE_SYS_ENTER_PROFILE(sname); \
static struct ftrace_event_call __used \
__attribute__((__aligned__(4))) \
@@ -179,7 +166,7 @@ static void prof_sysexit_disable_##sname(struct ftrace_event_call *unused) \
.name = "sys_enter"#sname, \
.system = "syscalls", \
.event = &enter_syscall_print_##sname, \
- .raw_init = init_enter_##sname, \
+ .raw_init = init_syscall_trace, \
.show_format = syscall_enter_format, \
.define_fields = syscall_enter_define_fields, \
.regfunc = reg_event_syscall_enter, \
@@ -194,19 +181,6 @@ static void prof_sysexit_disable_##sname(struct ftrace_event_call *unused) \
struct trace_event exit_syscall_print_##sname = { \
.trace = print_syscall_exit, \
}; \
- static int init_exit_##sname(struct ftrace_event_call *call) \
- { \
- int num, id; \
- num = __syscall_meta_##sname.syscall_nr; \
- if (num < 0) \
- return -ENOSYS; \
- id = register_ftrace_event(&exit_syscall_print_##sname);\
- if (!id) \
- return -ENODEV; \
- event_exit_##sname.id = id; \
- INIT_LIST_HEAD(&event_exit_##sname.fields); \
- return 0; \
- } \
TRACE_SYS_EXIT_PROFILE(sname); \
static struct ftrace_event_call __used \
__attribute__((__aligned__(4))) \
@@ -215,7 +189,7 @@ static void prof_sysexit_disable_##sname(struct ftrace_event_call *unused) \
.name = "sys_exit"#sname, \
.system = "syscalls", \
.event = &exit_syscall_print_##sname, \
- .raw_init = init_exit_##sname, \
+ .raw_init = init_syscall_trace, \
.show_format = syscall_exit_format, \
.define_fields = syscall_exit_define_fields, \
.regfunc = reg_event_syscall_exit, \
diff --git a/include/trace/syscall.h b/include/trace/syscall.h
index 1531eef..dff9371 100644
--- a/include/trace/syscall.h
+++ b/include/trace/syscall.h
@@ -32,6 +32,7 @@ struct syscall_metadata {

#ifdef CONFIG_FTRACE_SYSCALLS
extern unsigned long arch_syscall_addr(int nr);
+extern int init_syscall_trace(struct ftrace_event_call *call);

extern int syscall_enter_format(struct ftrace_event_call *call,
struct trace_seq *s);
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 144cc14..c651409 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -412,6 +412,18 @@ void unreg_event_syscall_exit(struct ftrace_event_call *call)
mutex_unlock(&syscall_trace_lock);
}

+int init_syscall_trace(struct ftrace_event_call *call)
+{
+ int id;
+
+ id = register_ftrace_event(call->event);
+ if (!id)
+ return -ENODEV;
+ call->id = id;
+ INIT_LIST_HEAD(&call->fields);
+ return 0;
+}
+
int __init init_ftrace_syscalls(void)
{
struct syscall_metadata *meta;



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