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    SubjectRe: [PATCH] SPARC64: fix iommu sg chaining
    On Wed, Oct 17 2007, David Miller wrote:
    > From: Jens Axboe <jens.axboe@oracle.com>
    > Date: Wed, 17 Oct 2007 12:58:40 +0200
    >
    > > The problem is that you cannot zero the entire sg entry, because then
    > > you'd potentially overwrite the chain pointer.
    > >
    > > I'd propose just adding a
    > >
    > > sg_dma_address(sg) = 0;
    > > sg_dma_len(sg) = 0;
    > >
    > > there for now, or provide an arch_clear_sg_entry() helper if we need
    > > more killed.
    >
    > The "chain pointer" is indicated by an sg->page with the low
    > bit set, but we're explicitly initializing it here to a
    > non-chain page pointer value.
    >
    > What's the problem?

    See next mail :-)

    --
    Jens Axboe

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