[PATCH v4 51/66] mm/khugepaged: Use maple tree iterators instead of vma linked list

[Liam Howlett]

From: "Liam R. Howlett" <Liam.Howlett at Oracle.com>

Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
Signed-off-by: Liam R. Howlett <Liam.Howlett at Oracle.com>
---
 mm/huge_memory.c | 4 ++--
 mm/khugepaged.c  | 9 ++++++---
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index e5483347291c..f0f4ff5239ef 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2270,11 +2270,11 @@ void vma_adjust_trans_huge(struct vm_area_struct *vma,
 	split_huge_pmd_if_needed(vma, end);
 
 	/*
-	 * If we're also updating the vma->vm_next->vm_start,
+	 * If we're also updating the vma_next(vma)->vm_start,
 	 * check if we need to split it.
 	 */
 	if (adjust_next > 0) {
-		struct vm_area_struct *next = vma->vm_next;
+		struct vm_area_struct *next = find_vma(vma->vm_mm, vma->vm_end);
 		unsigned long nstart = next->vm_start;
 		nstart += adjust_next;
 		split_huge_pmd_if_needed(next, nstart);
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 0ff7d72cdd1d..8f0633481791 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -2083,6 +2083,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages,
 	struct mm_struct *mm;
 	struct vm_area_struct *vma;
 	int progress = 0;
+	unsigned long address;
 
 	VM_BUG_ON(!pages);
 	lockdep_assert_held(&khugepaged_mm_lock);
@@ -2106,11 +2107,13 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages,
 	vma = NULL;
 	if (unlikely(!mmap_read_trylock(mm)))
 		goto breakouterloop_mmap_lock;
-	if (likely(!khugepaged_test_exit(mm)))
-		vma = find_vma(mm, khugepaged_scan.address);
 
 	progress++;
-	for (; vma; vma = vma->vm_next) {
+	if (unlikely(khugepaged_test_exit(mm)))
+		goto breakouterloop;
+
+	address = khugepaged_scan.address;
+	mt_for_each(&mm->mm_mt, vma, address, ULONG_MAX) {
 		unsigned long hstart, hend;
 
 		cond_resched();
-- 
2.30.2