atomics: document that linux expects certain atomic behaviour fromunsigned long

[Pavel Machek]

Linux relies on unsigned long to behave like atomic for read/write.
diff --git a/Documentation/atomic_ops.txt b/Documentation/atomic_ops.txt
index 4ef2450..0a7d180 100644
--- a/Documentation/atomic_ops.txt
+++ b/Documentation/atomic_ops.txt
@@ -21,6 +21,9 @@ local_t is very similar to atomic_t. If the counter is per CPU and only
 updated by one CPU, local_t is probably more appropriate. Please see
 Documentation/local_ops.txt for the semantics of local_t.
 
+unsigned long can be used instead of atomic_t, if all you
+need is atomic setting and atomic reading.
+
 The first operations to implement for atomic_t's are the initializers and
 plain reads.
 

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