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.
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