On Tue, 5 May 2009 22:38:07 +0200 Johannes Weiner <hannes@xxxxxxxxxxx> wrote: > On Tue, May 05, 2009 at 12:24:42PM -0700, Andrew Morton wrote: > > On Mon, 4 May 2009 11:54:32 +0200 > > Johannes Weiner <hannes@xxxxxxxxxxx> 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(). So we could bundle these patches with Magnus's patchset, or we could consider these three patches as a cleanup or something. Given that 3/3 introduces an unused function, I'm inclined to sit tight and await Magnus's work. -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
