tree 781b7b812c8fd4a51dbcdc238e8b90c4b3a2cbb6
parent fcd05b50fca44be3f96f8a17c5cce778669c29e7
author Heiko Carstens <heiko.carstens@de.ibm.com> 1378902527 +0200
committer Martin Schwidefsky <schwidefsky@de.ibm.com> 1382627806 +0200

s390/atomic: implement atomic_sub_return() with atomic_add_return()

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>