[S390] atomic: use ACCESS_ONCE() for atomic_read()
Let's make atomic_read() and atomic_set() behave like on all/most other architectures. Generated code is identical with gcc 4.5.2. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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