From: Liam R. Howlett <Liam.Howlett@Oracle.com>
Date: Thu, 14 Apr 2022 06:07:21 +0000 (-0700)
Subject: mm/gup: use maple tree navigation instead of linked list
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=7ba6baf18b7388e5ba52776d6b9f85409fbb4caf;p=users%2Fjedix%2Flinux-maple.git

mm/gup: use maple tree navigation instead of linked list

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

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
---

diff --git a/mm/gup.c b/mm/gup.c
index 5c17d4816441..d6dd04b8d803 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1609,10 +1609,11 @@ 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