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trace_syscalls: Add syscall_nr field to struct syscall_metadata

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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>
This commit is contained in:
Lai Jiangshan 2009-12-01 16:23:47 +08:00 committed by Ingo Molnar
parent fcc19438dd
commit c252f65793
3 changed files with 13 additions and 16 deletions
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4
include/linux/syscalls.h
View File

@ -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);\

3
include/trace/syscall.h
View File

@ -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);

22
kernel/trace/trace_syscalls.c
View File

@ -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;
}