ring-buffer: Fix ring buffer size in rb_write_something()

'cnt' should be used to calculate ring buffer size rather than data->cnt

Link: http://lkml.kernel.org/r/1537704693-184237-1-git-send-email-yuehaibing@huawei.com
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 41b6f96e5366231d72454e6c33015188066751ae..4f33d7d841af06deee570f4ecf0d25a68d6a6fc8 100644 (file)
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -4979,7 +4979,7 @@ static __init int rb_write_something(struct rb_test_data *data, bool nested)
        cnt = data->cnt + (nested ? 27 : 0);
 
        /* Multiply cnt by ~e, to make some unique increment */
-       size = (data->cnt * 68 / 25) % (sizeof(rb_string) - 1);
+       size = (cnt * 68 / 25) % (sizeof(rb_string) - 1);
 
        len = size + sizeof(struct rb_item);