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Date: Tue, 01 Dec 2009 16:23:47 +0800
From: Lai Jiangshan <laijs@...fujitsu.com>
To: Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...e.hu>,
Jason Baron <jbaron@...hat.com>,
Frederic Weisbecker <fweisbec@...il.com>,
LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 4/7] 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@...fujitsu.com>
---
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index b9af875..3c280d7 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -161,7 +161,7 @@ static void prof_sysexit_disable_##sname(struct ftrace_event_call *unused) \
static int init_enter_##sname(struct ftrace_event_call *call) \
{ \
int num, id; \
- num = syscall_name_to_nr("sys"#sname); \
+ num = __syscall_meta_##sname.syscall_nr; \
if (num < 0) \
return -ENOSYS; \
id = register_ftrace_event(&enter_syscall_print_##sname);\
@@ -197,7 +197,7 @@ static void prof_sysexit_disable_##sname(struct ftrace_event_call *unused) \
static int init_exit_##sname(struct ftrace_event_call *call) \
{ \
int num, id; \
- num = syscall_name_to_nr("sys"#sname); \
+ num = __syscall_meta_##sname.syscall_nr; \
if (num < 0) \
return -ENOSYS; \
id = register_ftrace_event(&exit_syscall_print_##sname);\
diff --git a/include/trace/syscall.h b/include/trace/syscall.h
index ca09561..1531eef 100644
--- a/include/trace/syscall.h
+++ b/include/trace/syscall.h
@@ -12,6 +12,7 @@
* A syscall entry in the ftrace syscalls array.
*
* @name: name of the syscall
+ * @syscall_nr: number of the syscall
* @nb_args: number of parameters it takes
* @types: list of types as strings
* @args: list of args as strings (args[i] matches types[i])
@@ -20,6 +21,7 @@
*/
struct syscall_metadata {
const char *name;
+ int syscall_nr;
int nb_args;
const char **types;
const char **args;
@@ -30,7 +32,6 @@ struct syscall_metadata {
#ifdef CONFIG_FTRACE_SYSCALLS
extern unsigned long arch_syscall_addr(int nr);
-extern int syscall_name_to_nr(const char *name);
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 27eb18d..144cc14 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(const char *name)
+static int syscall_name_to_nr(const char *name)
{
int i;
@@ -342,10 +342,8 @@ int reg_event_syscall_enter(struct ftrace_event_call *call)
{
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 @@ int reg_event_syscall_enter(struct ftrace_event_call *call)
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 reg_event_syscall_exit(struct ftrace_event_call *call)
{
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 @@ int reg_event_syscall_exit(struct ftrace_event_call *call)
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 @@ int __init init_ftrace_syscalls(void)
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;
}
--
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