Merge branch 'percpu'

Heiko Carstens says:

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Most of this is only about cleaning up the percpu code after preemptible
this_cpu_*() operations have been implemented. The first ten patches are
all more or less trivial cleanup patches trying to make the code shorter
and more readable.

The only non-trivial patch is the last one, which converts s390's
this_cpu_*() operations to use a similar scheme like Mark Rutland
provided it for arm64 [1]. This allows to simplify the irq entry and exit
path, however at the cost of slightly worse code for this_cpu_*()
operations.

The simplified irq entry and exit code seems to be worth it. Usable
performance numbers are not available yet, however I don't expect big
difference to before.

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Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

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