lockdep: Simplify lockdep_chains seqfile code

- make lc_next() call lc_start()
- use lock_chains directly instead of storing it in m->private

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <4A88ED57.5060609@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/lockdep_proc.c b/kernel/lockdep_proc.c
index 05fb5fd..2bbe25f 100644 (file)
--- a/kernel/lockdep_proc.c
+++ b/kernel/lockdep_proc.c
@@ -113,26 +113,6 @@ static const struct file_operations proc_lockdep_operations = {
 };
 
 #ifdef CONFIG_PROVE_LOCKING
-static void *lc_next(struct seq_file *m, void *v, loff_t *pos)
-{
-       struct lock_chain *chain;
-
-       (*pos)++;
-
-       if (v == SEQ_START_TOKEN)
-               chain = m->private;
-       else {
-               chain = v;
-
-               if (*pos - 1 < nr_lock_chains)
-                       chain = lock_chains + (*pos - 1);
-               else
-                       chain = NULL;
-       }
-
-       return chain;
-}
-
 static void *lc_start(struct seq_file *m, loff_t *pos)
 {
        if (*pos == 0)
@@ -144,6 +124,12 @@ static void *lc_start(struct seq_file *m, loff_t *pos)
        return NULL;
 }
 
+static void *lc_next(struct seq_file *m, void *v, loff_t *pos)
+{
+       (*pos)++;
+       return lc_start(m, pos);
+}
+
 static void lc_stop(struct seq_file *m, void *v)
 {
 }
@@ -184,16 +170,7 @@ static const struct seq_operations lockdep_chains_ops = {
 
 static int lockdep_chains_open(struct inode *inode, struct file *file)
 {
-       int res = seq_open(file, &lockdep_chains_ops);
-       if (!res) {
-               struct seq_file *m = file->private_data;
-
-               if (nr_lock_chains)
-                       m->private = lock_chains;
-               else
-                       m->private = NULL;
-       }
-       return res;
+       return seq_open(file, &lockdep_chains_ops);
 }
 
 static const struct file_operations proc_lockdep_chains_operations = {