tracing: Don't use the address of the buffer array name in copy_from_user

With the following code snippet:

    ...
    char buf[64];
    ...
    if (copy_from_user(&buf, ubuf, cnt))
    ...

Even though the value of "&buf" equals "buf", but there is no need
to get the address of the "buf" again. Use "buf" instead of "&buf".

Link: http://lkml.kernel.org/r/20160418152329.18b72bea@debian
Signed-off-by: Wang Xiaoqiang <wangxq10@lzu.edu.cn>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 5e3ad3481e4b7382f243b9913ed86e62f995ba50..46028d47d252b0142a43eabcf3648d6c5f744161 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3664,7 +3664,7 @@ tracing_trace_options_write(struct file *filp, const char __user *ubuf,
        if (cnt >= sizeof(buf))
                return -EINVAL;
 
-       if (copy_from_user(&buf, ubuf, cnt))
+       if (copy_from_user(buf, ubuf, cnt))
                return -EFAULT;
 
        buf[cnt] = 0;
@@ -4537,7 +4537,7 @@ tracing_set_trace_write(struct file *filp, const char __user *ubuf,
        if (cnt > MAX_TRACER_SIZE)
                cnt = MAX_TRACER_SIZE;
 
-       if (copy_from_user(&buf, ubuf, cnt))
+       if (copy_from_user(buf, ubuf, cnt))
                return -EFAULT;
 
        buf[cnt] = 0;
@@ -5327,7 +5327,7 @@ static ssize_t tracing_clock_write(struct file *filp, const char __user *ubuf,
        if (cnt >= sizeof(buf))
                return -EINVAL;
 
-       if (copy_from_user(&buf, ubuf, cnt))
+       if (copy_from_user(buf, ubuf, cnt))
                return -EFAULT;
 
        buf[cnt] = 0;