trace_syscalls: Set event_enter_##sname->data to its metadata

Set event_enter_##sname->data to its metadata,
it makes codes simpler.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Acked-by: Jason Baron <jbaron@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4B14D282.7050709@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 11 insertions, 25 deletions

diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 00d6e176f5b6..39649b1675dd 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -51,7 +51,7 @@ static struct syscall_metadata *syscall_nr_to_meta(int nr)
 	return syscalls_metadata[nr];
 }
 
-int syscall_name_to_nr(char *name)
+int syscall_name_to_nr(const char *name)
 {
 	int i;
 
@@ -172,18 +172,11 @@ extern char *__bad_type_size(void);
 int syscall_enter_format(struct ftrace_event_call *call, struct trace_seq *s)
 {
 	int i;
-	int nr;
 	int ret;
-	struct syscall_metadata *entry;
+	struct syscall_metadata *entry = call->data;
 	struct syscall_trace_enter trace;
 	int offset = offsetof(struct syscall_trace_enter, args);
 
-	nr = syscall_name_to_nr(call->data);
-	entry = syscall_nr_to_meta(nr);
-
-	if (!entry)
-		return 0;
-
 	ret = trace_seq_printf(s, "\tfield:%s %s;\toffset:%zu;\tsize:%zu;"
 			       "\tsigned:%u;\n",
 			       SYSCALL_FIELD(int, nr));
@@ -245,18 +238,11 @@ int syscall_exit_format(struct ftrace_event_call *call, struct trace_seq *s)
 int syscall_enter_define_fields(struct ftrace_event_call *call)
 {
 	struct syscall_trace_enter trace;
-	struct syscall_metadata *meta;
+	struct syscall_metadata *meta = call->data;
 	int ret;
-	int nr;
 	int i;
 	int offset = offsetof(typeof(trace), args);
 
-	nr = syscall_name_to_nr(call->data);
-	meta = syscall_nr_to_meta(nr);
-
-	if (!meta)
-		return 0;
-
 	ret = trace_define_common_fields(call);
 	if (ret)
 		return ret;
@@ -366,9 +352,9 @@ int reg_event_syscall_enter(struct ftrace_event_call *call)
 {
 	int ret = 0;
 	int num;
-	char *name;
+	const char *name;
 
-	name = (char *)call->data;
+	name = ((struct syscall_metadata *)call->data)->name;
 	num = syscall_name_to_nr(name);
 	if (num < 0 || num >= NR_syscalls)
 		return -ENOSYS;
@@ -389,9 +375,9 @@ int reg_event_syscall_enter(struct ftrace_event_call *call)
 void unreg_event_syscall_enter(struct ftrace_event_call *call)
 {
 	int num;
-	char *name;
+	const char *name;
 
-	name = (char *)call->data;
+	name = ((struct syscall_metadata *)call->data)->name;
 	num = syscall_name_to_nr(name);
 	if (num < 0 || num >= NR_syscalls)
 		return;
@@ -407,9 +393,9 @@ int reg_event_syscall_exit(struct ftrace_event_call *call)
 {
 	int ret = 0;
 	int num;
-	char *name;
+	const char *name;
 
-	name = call->data;
+	name = ((struct syscall_metadata *)call->data)->name;
 	num = syscall_name_to_nr(name);
 	if (num < 0 || num >= NR_syscalls)
 		return -ENOSYS;
@@ -430,9 +416,9 @@ int reg_event_syscall_exit(struct ftrace_event_call *call)
 void unreg_event_syscall_exit(struct ftrace_event_call *call)
 {
 	int num;
-	char *name;
+	const char *name;
 
-	name = call->data;
+	name = ((struct syscall_metadata *)call->data)->name;
 	num = syscall_name_to_nr(name);
 	if (num < 0 || num >= NR_syscalls)
 		return;