linux-toradex.git/arch/s390/include/asm/cmpxchg.h, branch v3.2.2

[S390] percpu: implement arch specific irqsafe_cpu_ops

2011-05-23T08:24:29+00:00

Implement arch specific irqsafe_cpu ops. The arch specific ops do not
disable/enable interrupts since that is an expensive operation. Instead
we disable preemption and perform a compare and swap loop.
Since on server distros (the ones we care about) preemption is disabled
the preempt_disable()/preempt_enable() pair is a nop.
In the end this code should be faster than the generic one.

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

[S390] cmpxchg: implement cmpxchg64()

2011-03-23T09:16:00+00:00

We have a cmpxchg64_local() implementation but strange enough the
SMP capable variant cmpxchg64() is missing. So implement it.

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

[S390] xchg/cmpxchg: move to own header file

2011-03-23T09:15:59+00:00

Move xchg() and cmpxchg() functions to own header file like some
other architectures have done.
With this we make sure that system.h now really looks like a place
where everything is gathered that doesn't fit anywhere else.

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky