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Implement arch_atomic_inc() / arch_atomic_dec() functions which result in a single instruction if compiled for z196 or newer architectures. Reduces the kernel image size by ~6K (defconfig): bloat-o-meter: add/remove: 0/0 grow/shrink: 12/1005 up/down: 106/-6404 (-6298) Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>