The patch titled
Subject: mm/mmap: reorder validate_mm_mt() checks
has been added to the -mm mm-unstable branch. Its filename is
mm-start-tracking-vmas-with-maple-tree-fix.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-start-tracking-vmas-with-maple-tree-fix.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx>
Subject: mm/mmap: reorder validate_mm_mt() checks
Date: Tue, 28 Jun 2022 15:08:19 -0400
Allows for detecting broken trees before attempting to iterate over the tree.
Link: https://lkml.kernel.org/r/20220629153127.p2k2cqkc7qy7f3vw@revolver
Fixes: de4583ed958b (mm: start tracking VMAs with maple tree)
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mmap.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/mm/mmap.c~mm-start-tracking-vmas-with-maple-tree-fix
+++ a/mm/mmap.c
@@ -392,6 +392,8 @@ static void validate_mm_mt(struct mm_str
struct vm_area_struct *vma_mt, *vma = mm->mmap;
MA_STATE(mas, mt, 0, 0);
+
+ mt_validate(&mm->mm_mt);
mas_for_each(&mas, vma_mt, ULONG_MAX) {
if (xa_is_zero(vma_mt))
continue;
@@ -440,7 +442,6 @@ static void validate_mm_mt(struct mm_str
}
VM_BUG_ON(vma);
- mt_validate(&mm->mm_mt);
}
#else
#define validate_mm_mt(root) do { } while (0)
_
Patches currently in -mm which might be from Liam.Howlett@xxxxxxxxxx are
android-binder-stop-saving-a-pointer-to-the-vma.patch
mm-start-tracking-vmas-with-maple-tree-fix.patch
