Prev: [PATCH 0/8] tracing: further shrinking trace events
Next: [PATCH] ext4: Add a missing trace hook
From: Li Zefan on 24 May 2010 04:30
Let trace_module_add_events() and event_trace_init() call
__trace_add_event_call().

Signed-off-by: Li Zefan <lizf(a)cn.fujitsu.com>
---
kernel/trace/trace_events.c | 70 +++++++++++-------------------------------
1 files changed, 19 insertions(+), 51 deletions(-)

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index b5d5b73..f4dbce1 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -1009,11 +1009,17 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events,
return 0;
}

-static int __trace_add_event_call(struct ftrace_event_call *call)
+static int
+__trace_add_event_call(struct ftrace_event_call *call, struct module *mod,
+ const struct file_operations *id,
+ const struct file_operations *enable,
+ const struct file_operations *filter,
+ const struct file_operations *format)
{
struct dentry *d_events;
int ret;

+ /* The linker may leave blanks */
if (!call->name)
return -EINVAL;

@@ -1021,8 +1027,8 @@ static int __trace_add_event_call(struct ftrace_event_call *call)
ret = call->class->raw_init(call);
if (ret < 0) {
if (ret != -ENOSYS)
- pr_warning("Could not initialize trace "
- "events/%s\n", call->name);
+ pr_warning("Could not initialize trace events/%s\n",
+ call->name);
return ret;
}
}
@@ -1031,11 +1037,10 @@ static int __trace_add_event_call(struct ftrace_event_call *call)
if (!d_events)
return -ENOENT;

- ret = event_create_dir(call, d_events, &ftrace_event_id_fops,
- &ftrace_enable_fops, &ftrace_event_filter_fops,
- &ftrace_event_format_fops);
+ ret = event_create_dir(call, d_events, id, enable, filter, format);
if (!ret)
list_add(&call->list, &ftrace_events);
+ call->mod = mod;

return ret;
}
@@ -1045,7 +1050,10 @@ int trace_add_event_call(struct ftrace_event_call *call)
{
int ret;
mutex_lock(&event_mutex);
- ret = __trace_add_event_call(call);
+ ret = __trace_add_event_call(call, NULL, &ftrace_event_id_fops,
+ &ftrace_enable_fops,
+ &ftrace_event_filter_fops,
+ &ftrace_event_format_fops);
mutex_unlock(&event_mutex);
return ret;
}
@@ -1162,8 +1170,6 @@ static void trace_module_add_events(struct module *mod)
{
struct ftrace_module_file_ops *file_ops = NULL;
struct ftrace_event_call *call, *start, *end;
- struct dentry *d_events;
- int ret;

start = mod->trace_events;
end = mod->trace_events + mod->num_trace_events;
@@ -1171,38 +1177,14 @@ static void trace_module_add_events(struct module *mod)
if (start == end)
return;

- d_events = event_trace_events_dir();
- if (!d_events)
+ file_ops = trace_create_file_ops(mod);
+ if (!file_ops)
return;

for_each_event(call, start, end) {
- /* The linker may leave blanks */
- if (!call->name)
- continue;
- if (call->class->raw_init) {
- ret = call->class->raw_init(call);
- if (ret < 0) {
- if (ret != -ENOSYS)
- pr_warning("Could not initialize trace "
- "point events/%s\n", call->name);
- continue;
- }
- }
- /*
- * This module has events, create file ops for this module
- * if not already done.
- */
- if (!file_ops) {
- file_ops = trace_create_file_ops(mod);
- if (!file_ops)
- return;
- }
- call->mod = mod;
- ret = event_create_dir(call, d_events,
+ __trace_add_event_call(call, mod,
&file_ops->id, &file_ops->enable,
&file_ops->filter, &file_ops->format);
- if (!ret)
- list_add(&call->list, &ftrace_events);
}
}

@@ -1333,24 +1315,10 @@ static __init int event_trace_init(void)
pr_warning("tracing: Failed to allocate common fields");

for_each_event(call, __start_ftrace_events, __stop_ftrace_events) {
- /* The linker may leave blanks */
- if (!call->name)
- continue;
- if (call->class->raw_init) {
- ret = call->class->raw_init(call);
- if (ret < 0) {
- if (ret != -ENOSYS)
- pr_warning("Could not initialize trace "
- "point events/%s\n", call->name);
- continue;
- }
- }
- ret = event_create_dir(call, d_events, &ftrace_event_id_fops,
+ __trace_add_event_call(call, NULL, &ftrace_event_id_fops,
&ftrace_enable_fops,
&ftrace_event_filter_fops,
&ftrace_event_format_fops);
- if (!ret)
- list_add(&call->list, &ftrace_events);
}

while (true) {
--
1.6.3

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Prev: [PATCH 0/8] tracing: further shrinking trace events
Next: [PATCH] ext4: Add a missing trace hook