On Tue, May 05, 2009 at 12:24:42PM -0700, Andrew Morton wrote: > On Mon, 4 May 2009 11:54:32 +0200 > Johannes Weiner <han...@cmpxchg.org> wrote: > > > A generic readonly page table lookup helper to map an address space > > and an address from it to a pte. > > umm, OK. > > Is there actually some point to these three patches? If so, what is it?
Magnus needs to check for physical contiguity of a VMAs backing pages to support zero-copy exportation of video data to userspace. This series implements follow_pfn() so he can walk the VMA backing pages and ensure their PFNs are in linear order. [ This patch can be collapsed with 2/3, I just thought it would be easier to read the diffs when having them separate. ] 1/3 and 2/3: factor out the page table walk from follow_phys() into follow_pte(). 3/3: implement follow_pfn() on top of follow_pte(). -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
