[PATCH] trace: fix a wrong usage of simple_read_from_buffer()

[Amerigo Wang]

The last argument of simple_read_from_buffer() is the amount of the
available bytes in the buffer, not the size of the buffer.

Signed-off-by: WANG Cong <amwang@xxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>

---
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index a884c09..3a0bc70 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2125,7 +2125,7 @@ tracing_cpumask_read(struct file *filp, char __user *ubuf,
 		goto out_err;
 	}
 	len += sprintf(mask_str + len, "\n");
-	count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1);
+	count = simple_read_from_buffer(ubuf, count, ppos, mask_str, len);
 
 out_err:
 	mutex_unlock(&tracing_cpumask_update_lock);
--
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