[PATCH resend] rmap: recompute pgoff for unmapping huge page

[Hillf Danton]

[Resend due to error in delivering to linux-kernel@xxxxxxxxxxxxxxx,
caused probably by the rich format provided by the mail agent by default.]

We have to recompute pgoff if the given page is huge, since result based on
HPAGE_SIZE is not approapriate for scanning the vma interval tree, as shown
by commit 36e4f20af833(hugetlb: do not use vma_hugecache_offset() for
vma_prio_tree_foreach)

Signed-off-by: Hillf Danton <dhillf@xxxxxxxxx>
---

--- a/mm/rmap.c	Mon Mar  4 20:00:00 2013
+++ b/mm/rmap.c	Mon Mar  4 20:02:16 2013
@@ -1513,6 +1513,9 @@ static int try_to_unmap_file(struct page
 	unsigned long max_nl_size = 0;
 	unsigned int mapcount;

+	if (PageHuge(page))
+		pgoff = page->index << compound_order(page);
+
 	mutex_lock(&mapping->i_mmap_mutex);
 	vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff) {
 		unsigned long address = vma_address(page, vma);
--
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