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    Subject[patch] parisc, iommu: add missing include for prefetchw()
    prefetchw() requires it to be defined by linux/prefetch.h, or it results
    in a compile error:

    In file included from drivers/parisc/sba_iommu.c:916:0:
    drivers/parisc/iommu-helpers.h: In function 'iommu_fill_pdir':
    drivers/parisc/iommu-helpers.h:62:4: error: implicit declaration of function 'prefetchw'

    Include linux/prefetch.h.

    Signed-off-by: David Rientjes <rientjes@google.com>
    ---
    drivers/parisc/iommu-helpers.h | 2 ++
    1 files changed, 2 insertions(+)

    diff --git a/drivers/parisc/iommu-helpers.h b/drivers/parisc/iommu-helpers.h
    --- a/drivers/parisc/iommu-helpers.h
    +++ b/drivers/parisc/iommu-helpers.h
    @@ -1,3 +1,5 @@
    +#include <linux/prefetch.h>
    +
    /**
    * iommu_fill_pdir - Insert coalesced scatter/gather chunks into the I/O Pdir.
    * @ioc: The I/O Controller.

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