On Wed, 2007-06-27 at 11:12 -0700, Casey Leedom wrote:
> Hello,
>
> I'm working on a driver that does a get_user_pages() for a DMA write. We
> have a timeout on the DMA completion where we mark the pages as COW and return
> to the application so it can potentially generate more data in order to
> increase throughput, etc. The problem is that when we traverse the
> PGT/PUD/PMD/PTE hierarchy to mark the pages, we sometime fault out when the PUD
> covering [0x80000000, 0xc0000000) comes out as zero when that entire region is
> covered by a single large malloc()'ed buffer.
you forgot to attach your source code or provide a URL to it.....
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