| 4c2241fd42298007d7c3a92318806a4a9490a93c |
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23-May-2011 |
Heiko Carstens <heiko.carstens@de.ibm.com> |
[S390] percpu: implement arch specific irqsafe_cpu_ops
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 <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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| 54eaae3028e6b09de0bd2232a8176fc0d0a2397a |
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23-Mar-2011 |
Heiko Carstens <heiko.carstens@de.ibm.com> |
[S390] cmpxchg: implement cmpxchg64()
We have a cmpxchg64_local() implementation but strange enough the
SMP capable variant cmpxchg64() is missing. So implement it.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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| a2c9dbe8dbb8591ae6fd142e562813cd95d06609 |
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23-Mar-2011 |
Heiko Carstens <heiko.carstens@de.ibm.com> |
[S390] xchg/cmpxchg: move to own header file
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 <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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