[PATCH 4/4] atomic: Update comments in atomic.h

[Arun Sharma <asharma@fb.com>]

This clarifies the differences between <linux/atomic.h> and
<asm-generic/atomic.h>

Signed-off-by: Arun Sharma <asharma@fb.com>
Suggested-by: Mike Frysinger <vapier.adi@gmail.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: David Miller <davem@davemloft.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
---
 include/asm-generic/atomic.h |    4 +++-
 include/linux/atomic.h       |    1 +
 2 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/include/asm-generic/atomic.h b/include/asm-generic/atomic.h
index a8fad94..90e23ea 100644
--- a/include/asm-generic/atomic.h
+++ b/include/asm-generic/atomic.h
@@ -1,5 +1,7 @@
 /*
- * Generic C implementation of atomic counter operations
+ * Generic C implementation of atomic counter operations. Usable on
+ * UP systems only. Do not include in machine independent code.
+ *
  * Originally implemented for MN10300.
  *
  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
diff --git a/include/linux/atomic.h b/include/linux/atomic.h
index f2e6529..9f3a4ea 100644
--- a/include/linux/atomic.h
+++ b/include/linux/atomic.h
@@ -1,3 +1,4 @@
+/* Atomic operations usable in machine independent code */
 #ifndef _LINUX_ATOMIC_H
 #define _LINUX_ATOMIC_H
 #include <asm/atomic.h>
-- 
1.7.4