ftrace: Do not copy old hash when resetting

Do not waste time copying the old hash if the hash is going to be
reset. Just allocate a new hash and free the old one, as that is
the same result as copying te old one and then resetting it.

Link: http://lkml.kernel.org/p/1405384820-48837-1-git-send-email-wangnan0@huawei.com

Signed-off-by: Wang Nan <wangnan0@huawei.com>
[ SDR: Removed unused ftrace_filter_reset() function ]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 5 insertions, 10 deletions

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 4c61f28a08e0..762806026561 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2949,13 +2949,6 @@ ftrace_enabled_open(struct inode *inode, struct file *file)
         return iter ? 0 : -ENOMEM;
 }
 
-static void ftrace_filter_reset(struct ftrace_hash *hash)
-{
-        mutex_lock(&ftrace_lock);
-        ftrace_hash_clear(hash);
-        mutex_unlock(&ftrace_lock);
-}
-
 /**
  * ftrace_regex_open - initialize function tracer filter files
  * @ops: The ftrace_ops that hold the hash filters
@@ -3720,14 +3713,16 @@ ftrace_set_hash(struct ftrace_ops *ops, unsigned char *buf, int len,
         else
                 orig_hash = &ops->notrace_hash;
 
-        hash = alloc_and_copy_ftrace_hash(FTRACE_HASH_DEFAULT_BITS, *orig_hash);
+        if (reset)
+                hash = alloc_ftrace_hash(FTRACE_HASH_DEFAULT_BITS);
+        else
+                hash = alloc_and_copy_ftrace_hash(FTRACE_HASH_DEFAULT_BITS, *orig_hash);
+
         if (!hash) {
                 ret = -ENOMEM;
                 goto out_regex_unlock;
         }
 
-        if (reset)
-                ftrace_filter_reset(hash);
         if (buf && !ftrace_match_records(hash, buf, len)) {
                 ret = -EINVAL;
                 goto out_regex_unlock;