[PATCH v11 51/69] mm/gup: use maple tree navigation instead of linked list

[Liam Howlett]

From: "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx>

Use find_vma_intersection() to locate the VMAs in __mm_populate() instead
of using find_vma() and the linked list.

Link: https://lkml.kernel.org/r/20220504011345.662299-36-Liam.Howlett@xxxxxxxxxx
Link: https://lkml.kernel.org/r/20220621204632.3370049-52-Liam.Howlett@xxxxxxxxxx
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Cc: SeongJae Park <sj@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
 mm/gup.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/mm/gup.c b/mm/gup.c
index 407a81d5ca03..f0e5d68ea932 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1641,10 +1641,11 @@ int __mm_populate(unsigned long start, unsigned long len, int ignore_errors)
 		if (!locked) {
 			locked = 1;
 			mmap_read_lock(mm);
-			vma = find_vma(mm, nstart);
+			vma = find_vma_intersection(mm, nstart, end);
 		} else if (nstart >= vma->vm_end)
-			vma = vma->vm_next;
-		if (!vma || vma->vm_start >= end)
+			vma = find_vma_intersection(mm, vma->vm_end, end);
+
+		if (!vma)
 			break;
 		/*
 		 * Set [nstart; nend) to intersection of desired address
-- 
2.35.1