lkml.org 
[lkml]   [2010]   [Jun]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 19/40] trace syscalls: Remove redundant syscall_nr checks
Date
From: Ian Munsie <imunsie@au1.ibm.com>

With the ftrace events now checking if the syscall_nr is valid upon
initialisation, there is no need to verify it when registering and
unregistering the events, so remove the check.

Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
---
kernel/trace/trace_syscalls.c | 18 ------------------
1 files changed, 0 insertions(+), 18 deletions(-)

diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 6acba20..9010405 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -391,11 +391,7 @@ void ftrace_syscall_exit(void *ignore, struct pt_regs *regs, long ret)
int reg_event_syscall_enter(struct ftrace_event_call *call)
{
int ret = 0;
- int num;

- num = ((struct syscall_metadata *)call->data)->syscall_nr;
- if (num < 0 || num >= NR_syscalls)
- return -ENOSYS;
mutex_lock(&syscall_trace_lock);
if (!sys_refcount_enter)
ret = register_trace_sys_enter(ftrace_syscall_enter, NULL);
@@ -409,11 +405,6 @@ int reg_event_syscall_enter(struct ftrace_event_call *call)

void unreg_event_syscall_enter(struct ftrace_event_call *call)
{
- int num;
-
- num = ((struct syscall_metadata *)call->data)->syscall_nr;
- if (num < 0 || num >= NR_syscalls)
- return;
mutex_lock(&syscall_trace_lock);
sys_refcount_enter--;
((struct syscall_metadata *)call->data)->ftrace_enter = 0;
@@ -425,11 +416,7 @@ void unreg_event_syscall_enter(struct ftrace_event_call *call)
int reg_event_syscall_exit(struct ftrace_event_call *call)
{
int ret = 0;
- int num;

- num = ((struct syscall_metadata *)call->data)->syscall_nr;
- if (num < 0 || num >= NR_syscalls)
- return -ENOSYS;
mutex_lock(&syscall_trace_lock);
if (!sys_refcount_exit)
ret = register_trace_sys_exit(ftrace_syscall_exit, NULL);
@@ -443,11 +430,6 @@ int reg_event_syscall_exit(struct ftrace_event_call *call)

void unreg_event_syscall_exit(struct ftrace_event_call *call)
{
- int num;
-
- num = ((struct syscall_metadata *)call->data)->syscall_nr;
- if (num < 0 || num >= NR_syscalls)
- return;
mutex_lock(&syscall_trace_lock);
sys_refcount_exit--;
((struct syscall_metadata *)call->data)->ftrace_exit = 0;
--
1.7.1


\
 
 \ /
  Last update: 2010-06-23 12:13    [W:0.178 / U:0.436 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site