commit c252f65793874b56d50395ab604db465ce688665
author Lai Jiangshan <laijs@cn.fujitsu.com> Tue Dec 01 16:23:47 2009 +0800
committer Ingo Molnar <mingo@elte.hu> Tue Dec 01 17:33:29 2009 +0100
tree 30bc32361d2b368679910270ec4e99e841fa099b
parent fcc19438dda38dacc8c144e2db3ebc6b9fd4f8b8

trace_syscalls: Add syscall_nr field to struct syscall_metadata

Add syscall_nr field to struct syscall_metadata,
it helps us to get syscall number easier.

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: <4B14D293.6090800@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

kernel/trace/trace_syscalls.c

diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 27eb18d..144cc14 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -51,7 +51,7 @@
 	return syscalls_metadata[nr];
 }
 
-int syscall_name_to_nr(const char *name)
+static int syscall_name_to_nr(const char *name)
 {
 	int i;
 
@@ -342,10 +342,8 @@
 {
 	int ret = 0;
 	int num;
-	const char *name;
 
-	name = ((struct syscall_metadata *)call->data)->name;
-	num = syscall_name_to_nr(name);
+	num = ((struct syscall_metadata *)call->data)->syscall_nr;
 	if (num < 0 || num >= NR_syscalls)
 		return -ENOSYS;
 	mutex_lock(&syscall_trace_lock);
@@ -365,10 +363,8 @@
 void unreg_event_syscall_enter(struct ftrace_event_call *call)
 {
 	int num;
-	const char *name;
 
-	name = ((struct syscall_metadata *)call->data)->name;
-	num = syscall_name_to_nr(name);
+	num = ((struct syscall_metadata *)call->data)->syscall_nr;
 	if (num < 0 || num >= NR_syscalls)
 		return;
 	mutex_lock(&syscall_trace_lock);
@@ -383,10 +379,8 @@
 {
 	int ret = 0;
 	int num;
-	const char *name;
 
-	name = ((struct syscall_metadata *)call->data)->name;
-	num = syscall_name_to_nr(name);
+	num = ((struct syscall_metadata *)call->data)->syscall_nr;
 	if (num < 0 || num >= NR_syscalls)
 		return -ENOSYS;
 	mutex_lock(&syscall_trace_lock);
@@ -406,10 +400,8 @@
 void unreg_event_syscall_exit(struct ftrace_event_call *call)
 {
 	int num;
-	const char *name;
 
-	name = ((struct syscall_metadata *)call->data)->name;
-	num = syscall_name_to_nr(name);
+	num = ((struct syscall_metadata *)call->data)->syscall_nr;
 	if (num < 0 || num >= NR_syscalls)
 		return;
 	mutex_lock(&syscall_trace_lock);
@@ -436,6 +428,10 @@
 	for (i = 0; i < NR_syscalls; i++) {
 		addr = arch_syscall_addr(i);
 		meta = find_syscall_meta(addr);
+		if (!meta)
+			continue;
+
+		meta->syscall_nr = i;
 		syscalls_metadata[i] = meta;
 	}