s390/atomic: refactor atomic primitives
Rework atomic.h to make the low level functions avaible for use in other headers without using atomic_t, e.g. in bitops.h. Reviewed-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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