tracing: cleanup for tracing_trace_options_read()

'\n' is already appended, and what we need is just an extra
space for the '\0'.

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
LKML-Reference: <4A3EED63.3090908@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index e30e6b1..38a4a3e 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2256,8 +2256,8 @@ tracing_trace_options_read(struct file *filp, char __user *ubuf,
                len += 3; /* "no" and newline */
        }
 
-       /* +2 for \n and \0 */
-       buf = kmalloc(len + 2, GFP_KERNEL);
+       /* +1 for \0 */
+       buf = kmalloc(len + 1, GFP_KERNEL);
        if (!buf) {
                mutex_unlock(&trace_types_lock);
                return -ENOMEM;
@@ -2280,7 +2280,7 @@ tracing_trace_options_read(struct file *filp, char __user *ubuf,
        }
        mutex_unlock(&trace_types_lock);
 
-       WARN_ON(r >= len + 2);
+       WARN_ON(r >= len + 1);
 
        r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);