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tracing: Move a printk out of ftrace_raw_reg_event_foo()

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Move the printk from each ftrace_raw_reg_event_foo() to
its caller ftrace_event_enable_disable(). This avoids each
regfunc trace event callbacks to handle a same error report
that can be carried from the caller.

See how much space this saves:

   text    data     bss     dec     hex filename
5345151 1961864 7103260 14410275         dbe223 vmlinux.o.old
5331487 1961864 7103260 14396611         dbacc3 vmlinux.o

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Jason Baron <jbaron@redhat.com>
LKML-Reference: <4B1DC4AC.802@cn.fujitsu.com>
[start cmdline record before calling regfunc to avoid lost
window of pid to comm resolution]
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Li Zefan
2009-12-08 11:14:52 +08:00
committed by Frederic Weisbecker
parent 614a71a26b
commit 3b8e427381
3 changed files with 19 additions and 27 deletions
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20
kernel/trace/trace_events.c
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@@ -118,9 +118,11 @@ int trace_event_raw_init(struct ftrace_event_call *call)
}
EXPORT_SYMBOL_GPL(trace_event_raw_init);
static void ftrace_event_enable_disable(struct ftrace_event_call *call,
static int ftrace_event_enable_disable(struct ftrace_event_call *call,
int enable)
{
int ret = 0;
switch (enable) {
case 0:
if (call->enabled) {
@@ -131,12 +133,20 @@ static void ftrace_event_enable_disable(struct ftrace_event_call *call,
break;
case 1:
if (!call->enabled) {
call->enabled = 1;
tracing_start_cmdline_record();
call->regfunc(call);
ret = call->regfunc(call);
if (ret) {
tracing_stop_cmdline_record();
pr_info("event trace: Could not enable event "
"%s\n", call->name);
break;
}
call->enabled = 1;
}
break;
}
return ret;
}
static void ftrace_clear_events(void)
@@ -415,7 +425,7 @@ event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
case 0:
case 1:
mutex_lock(&event_mutex);
ftrace_event_enable_disable(call, val);
ret = ftrace_event_enable_disable(call, val);
mutex_unlock(&event_mutex);
break;
@@ -425,7 +435,7 @@ event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
*ppos += cnt;
return cnt;
return ret ? ret : cnt;
}
static ssize_t