[patch v2] hugetlb: correct page offset index for sharing pmd

[Hillf Danton]

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

Changes from v1
	o s/linear_page_index/linear_hugepage_index/ for clearer code
	o hp_idx variable added for less change


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
@@ -62,6 +62,7 @@ static void huge_pmd_share(struct mm_str
 {
 	struct vm_area_struct *vma = find_vma(mm, addr);
 	struct address_space *mapping = vma->vm_file->f_mapping;
+	pgoff_t hp_idx;
 	pgoff_t idx = ((addr - vma->vm_start) >> PAGE_SHIFT) +
 			vma->vm_pgoff;
 	struct prio_tree_iter iter;
@@ -72,8 +73,10 @@ static void huge_pmd_share(struct mm_str
 	if (!vma_shareable(vma, addr))
 		return;

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

--
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