[patch] hugetlb: correct page offset index for sharing pmd

[Hillf Danton]

The computation of page offset index is open coded, and incorrect, to
be used in scanning prio tree, as huge page offset is required, and is
fixed with the well defined routine.

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

--- a/arch/x86/mm/hugetlbpage.c	Fri Aug  3 20:34:58 2012
+++ b/arch/x86/mm/hugetlbpage.c	Fri Aug  3 20:40:16 2012
@@ -72,12 +72,15 @@ static void huge_pmd_share(struct mm_str
 	if (!vma_shareable(vma, addr))
 		return;

+	idx = linear_page_index(vma, addr);
+
 	mutex_lock(&mapping->i_mmap_mutex);
 	vma_prio_tree_foreach(svma, &iter, &mapping->i_mmap, idx, idx) {
 		if (svma == vma)
 			continue;

-		saddr = page_table_shareable(svma, vma, addr, idx);
+		saddr = page_table_shareable(svma, vma, addr,
+						idx * (PMD_SIZE/PAGE_SIZE));
 		if (saddr) {
 			spte = huge_pte_offset(svma->vm_mm, saddr);
 			if (spte) {
--
--
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