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s390/atomic: implement atomic_sub_return() with atomic_add_return()
authorHeiko Carstens <heiko.carstens@de.ibm.com>
Wed, 11 Sep 2013 12:28:47 +0000 (14:28 +0200)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>
Thu, 24 Oct 2013 15:16:46 +0000 (17:16 +0200)
Get rid of the own atomic_sub_return() implementation. Otherwise we can't
make use of the interlocked-access facility 1 instructions for
atomic_sub_return(), since there is no "load and subtract" instruction
available.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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