linux-kernel - [PATCH v2 22/36] mm/mmap: Change do_vmi_align_munmap() for maple tree iterator changes

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Date:   Fri,  5 May 2023 13:41:50 -0400
From:   "Liam R. Howlett" <Liam.Howlett@...cle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     maple-tree@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>
Subject: [PATCH v2 22/36] mm/mmap: Change do_vmi_align_munmap() for maple tree iterator changes

The maple tree iterator clean up is incompatible with the way
do_vmi_align_munmap() expects it to behave.  Update the expected
behaviour to map now since the change will work currently.

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 mm/mmap.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index bcebfd9266324..1602c854133a4 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2418,7 +2418,12 @@ do_vmi_align_munmap(struct vma_iterator *vmi, struct vm_area_struct *vma,
 #endif
 	}
 
-	next = vma_next(vmi);
+	if (vma_iter_end(vmi) > end)
+		next = vma_iter_load(vmi);
+
+	if (!next)
+		next = vma_next(vmi);
+
 	if (unlikely(uf)) {
 		/*
 		 * If userfaultfd_unmap_prep returns an error the vmas
-- 
2.39.2