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    SubjectRe: [PATCH 07 of 14] swiotlb: add arch hook to force mapping
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    On Tue, 16 Dec 2008 12:17:31 -0800
    Jeremy Fitzhardinge <jeremy@goop.org> wrote:

    > From: Ian Campbell <ian.campbell@citrix.com>
    >
    > Some architectures require special rules to determine whether a range
    > needs mapping or not. This adds a weak function for architectures to
    > override.
    >
    > Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
    > Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
    > ---
    > include/linux/swiotlb.h | 2 ++
    > lib/swiotlb.c | 15 +++++++++++++--
    > 2 files changed, 15 insertions(+), 2 deletions(-)
    >
    > diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
    > --- a/include/linux/swiotlb.h
    > +++ b/include/linux/swiotlb.h
    > @@ -30,6 +30,8 @@
    > extern dma_addr_t swiotlb_phys_to_bus(phys_addr_t address);
    > extern phys_addr_t swiotlb_bus_to_phys(dma_addr_t address);
    >
    > +extern int swiotlb_arch_range_needs_mapping(void *ptr, size_t size);
    > +
    > extern void
    > *swiotlb_alloc_coherent(struct device *hwdev, size_t size,
    > dma_addr_t *dma_handle, gfp_t flags);
    > diff --git a/lib/swiotlb.c b/lib/swiotlb.c
    > --- a/lib/swiotlb.c
    > +++ b/lib/swiotlb.c
    > @@ -145,6 +145,11 @@
    > return phys_to_virt(swiotlb_bus_to_phys(address));
    > }
    >
    > +int __weak swiotlb_arch_range_needs_mapping(void *ptr, size_t size)
    > +{
    > + return 0;
    > +}

    Can't you simply make address_needs_mapping __weak as Becky does?


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