kcsan: Add missing license and copyright headers

Adds missing license and/or copyright headers for KCSAN source files.

Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

kernel/kcsan/atomic.h

@@ -1,4 +1,9 @@
 /* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Rules for implicitly atomic memory accesses.
+ *
+ * Copyright (C) 2019, Google LLC.
+ */
 
 #ifndef _KERNEL_KCSAN_ATOMIC_H
 #define _KERNEL_KCSAN_ATOMIC_H

kernel/kcsan/core.c

@@ -1,4 +1,9 @@
 // SPDX-License-Identifier: GPL-2.0
+/*
+ * KCSAN core runtime.
+ *
+ * Copyright (C) 2019, Google LLC.
+ */
 
 #define pr_fmt(fmt) "kcsan: " fmt
 

kernel/kcsan/debugfs.c

@@ -1,4 +1,9 @@
 // SPDX-License-Identifier: GPL-2.0
+/*
+ * KCSAN debugfs interface.
+ *
+ * Copyright (C) 2019, Google LLC.
+ */
 
 #define pr_fmt(fmt) "kcsan: " fmt
 

kernel/kcsan/encoding.h

@@ -1,4 +1,9 @@
 /* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * KCSAN watchpoint encoding.
+ *
+ * Copyright (C) 2019, Google LLC.
+ */
 
 #ifndef _KERNEL_KCSAN_ENCODING_H
 #define _KERNEL_KCSAN_ENCODING_H

kernel/kcsan/kcsan.h

@@ -1,8 +1,9 @@
 /* SPDX-License-Identifier: GPL-2.0 */
-
 /*
  * The Kernel Concurrency Sanitizer (KCSAN) infrastructure. For more info please
  * see Documentation/dev-tools/kcsan.rst.
+ *
+ * Copyright (C) 2019, Google LLC.
  */
 
 #ifndef _KERNEL_KCSAN_KCSAN_H

kernel/kcsan/report.c

@@ -1,4 +1,9 @@
 // SPDX-License-Identifier: GPL-2.0
+/*
+ * KCSAN reporting.
+ *
+ * Copyright (C) 2019, Google LLC.
+ */
 
 #include <linux/debug_locks.h>
 #include <linux/delay.h>

kernel/kcsan/selftest.c

@@ -1,4 +1,9 @@
 // SPDX-License-Identifier: GPL-2.0
+/*
+ * KCSAN short boot-time selftests.
+ *
+ * Copyright (C) 2019, Google LLC.
+ */
 
 #define pr_fmt(fmt) "kcsan: " fmt