function-graph: use ftrace_graph_funcs directly

No need to store ftrace_graph_funcs in file->private.

Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <4AB32364.7020602@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index cc615f84751ba1e282d8af7fb3d2ed5ac8b4eae0..c71e91bf7372499efc0dec2a6ede46f9aa492d0a 100644 (file)
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2414,11 +2414,9 @@ unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS] __read_mostly;
 static void *
 __g_next(struct seq_file *m, loff_t *pos)
 {
-       unsigned long *array = m->private;
-
        if (*pos >= ftrace_graph_count)
                return NULL;
-       return &array[*pos];
+       return &ftrace_graph_funcs[*pos];
 }
 
 static void *
@@ -2482,16 +2480,10 @@ ftrace_graph_open(struct inode *inode, struct file *file)
                ftrace_graph_count = 0;
                memset(ftrace_graph_funcs, 0, sizeof(ftrace_graph_funcs));
        }
+       mutex_unlock(&graph_lock);
 
-       if (file->f_mode & FMODE_READ) {
+       if (file->f_mode & FMODE_READ)
                ret = seq_open(file, &ftrace_graph_seq_ops);
-               if (!ret) {
-                       struct seq_file *m = file->private_data;
-                       m->private = ftrace_graph_funcs;
-               }
-       } else
-               file->private_data = ftrace_graph_funcs;
-       mutex_unlock(&graph_lock);
 
        return ret;
 }
@@ -2560,7 +2552,6 @@ ftrace_graph_write(struct file *file, const char __user *ubuf,
                   size_t cnt, loff_t *ppos)
 {
        struct trace_parser parser;
-       unsigned long *array;
        size_t read = 0;
        ssize_t ret;
 
@@ -2574,12 +2565,6 @@ ftrace_graph_write(struct file *file, const char __user *ubuf,
                goto out;
        }
 
-       if (file->f_mode & FMODE_READ) {
-               struct seq_file *m = file->private_data;
-               array = m->private;
-       } else
-               array = file->private_data;
-
        if (trace_parser_get_init(&parser, FTRACE_BUFF_MAX)) {
                ret = -ENOMEM;
                goto out;
@@ -2591,7 +2576,7 @@ ftrace_graph_write(struct file *file, const char __user *ubuf,
                parser.buffer[parser.idx] = 0;
 
                /* we allow only one expression at a time */
-               ret = ftrace_set_func(array, &ftrace_graph_count,
+               ret = ftrace_set_func(ftrace_graph_funcs, &ftrace_graph_count,
                                        parser.buffer);
                if (ret)
                        goto out;