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Jana Saout confirmed that this fixes the page faults he saw. His problem was triggered by ocfs2 and autofs symlink lookups, where the symlink allocation was at the end of a page. But the deeper reason seems to be the use of Xen-PV, which is what then causes him to have all these unmapped pages, which is what then makes it a problem when the unaligned word-at-a-time code fetches data past the end of a page. * fix-unmapped-word-at-a-time: vfs: make word-at-a-time accesses handle a non-existing page