tracing/event: Cleanup the useless dentry variable

Cleanup the useless dentry variable while creating a kernel
event set of files. trace_create_file() warns if it fails to
create the file anyway, and we don't store the dentry anywhere.

v2: Fix a small conflict in kernel/trace/trace_events.c

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Li Zefan <lizf@cn.fujitsu.com>

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 56c260b..8c91b7c 100644 (file)
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -898,9 +898,9 @@ event_subsystem_dir(const char *name, struct dentry *d_events)
                           "'%s/filter' entry\n", name);
        }
 
-       entry = trace_create_file("enable", 0644, system->entry,
-                                 (void *)system->name,
-                                 &ftrace_system_enable_fops);
+       trace_create_file("enable", 0644, system->entry,
+                         (void *)system->name,
+                         &ftrace_system_enable_fops);
 
        return system->entry;
 }
@@ -912,7 +912,6 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events,
                 const struct file_operations *filter,
                 const struct file_operations *format)
 {
-       struct dentry *entry;
        int ret;
 
        /*
@@ -930,12 +929,12 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events,
        }
 
        if (call->regfunc)
-               entry = trace_create_file("enable", 0644, call->dir, call,
-                                         enable);
+               trace_create_file("enable", 0644, call->dir, call,
+                                 enable);
 
        if (call->id && call->profile_enable)
-               entry = trace_create_file("id", 0444, call->dir, call,
-                                         id);
+               trace_create_file("id", 0444, call->dir, call,
+                                 id);
 
        if (call->define_fields) {
                ret = call->define_fields(call);
@@ -944,16 +943,16 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events,
                                   " events/%s\n", call->name);
                        return ret;
                }
-               entry = trace_create_file("filter", 0644, call->dir, call,
-                                         filter);
+               trace_create_file("filter", 0644, call->dir, call,
+                                 filter);
        }
 
        /* A trace may not want to export its format */
        if (!call->show_format)
                return 0;
 
-       entry = trace_create_file("format", 0444, call->dir, call,
-                                 format);
+       trace_create_file("format", 0444, call->dir, call,
+                         format);
 
        return 0;
 }