+ mglru-vs-maple-tree-fix.patch added to -mm tree

+ mglru-vs-maple-tree-fix.patch added to -mm tree

[Andrew Morton]

The patch titled
     Subject: mm/vmscan: Use VMA_ITERATOR in get_next_vma()
has been added to the -mm tree.  Its filename is
     mglru-vs-maple-tree-fix.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mglru-vs-maple-tree-fix.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mglru-vs-maple-tree-fix.patch

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------------------------------------------------------
From: Liam Howlett <liam.howlett@oracle.com>
Subject: mm/vmscan: Use VMA_ITERATOR in get_next_vma()

The next vma may actually be many VMAs away, so use the VMA_ITERATOR to
continue searching from vm_end onwards.

Link: https://lkml.kernel.org/r/20220419174757.2tptlbkebiletmck@revolver
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/vmscan.c |   11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

--- a/mm/vmscan.c~mglru-vs-maple-tree-fix
+++ a/mm/vmscan.c
@@ -3697,24 +3697,21 @@ static bool get_next_vma(struct mm_walk
 			 unsigned long *start, unsigned long *end)
 {
 	unsigned long next = round_up(*end, size);
+	VMA_ITERATOR(vmi, walk->mm, walk->vma->vm_end)
 
 	VM_BUG_ON(mask & size);
 	VM_BUG_ON(*start >= *end);
 	VM_BUG_ON((next & mask) != (*start & mask));
 
-	while (walk->vma) {
-		if (next >= walk->vma->vm_end) {
-			walk->vma = find_vma(walk->mm, walk->vma->vm_end);
+	for_each_mte_vma(vmi, walk->vma) {
+		if (next >= walk->vma->vm_end)
 			continue;
-		}
 
 		if ((next & mask) != (walk->vma->vm_start & mask))
 			return false;
 
-		if (should_skip_vma(walk->vma->vm_start, walk->vma->vm_end, walk)) {
-			walk->vma = find_vma(walk->mm, walk->vma->vm_end);
+		if (should_skip_vma(walk->vma->vm_start, walk->vma->vm_end, walk))
 			continue;
-		}
 
 		*start = max(next, walk->vma->vm_start);
 		next = (next | ~mask) + 1;
_

Patches currently in -mm which might be from liam.howlett@oracle.com are

radix-tree-test-suite-add-lockdep_is_held-to-header.patch
mips-rename-mt_init-to-mips_mt_init.patch
lib-test_maple_tree-add-testing-for-maple-tree.patch
mmap-change-zeroing-of-maple-tree-in-__vma_adjust.patch
riscv-use-vma-iterator-for-vdso.patch
mm-mmapc-pass-in-mapping-to-__vma_link_file.patch
mglru-vs-maple-tree-fix.patch