The patch titled
Subject: mm: enable maple tree RCU mode by default.
has been added to the -mm mm-unstable branch. Its filename is
mm-enable-maple-tree-rcu-mode-by-default-v8.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-enable-maple-tree-rcu-mode-by-default-v8.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: enable maple tree RCU mode by default.
Date: Mon, 27 Mar 2023 14:55:32 -0400
unchangelogged update
Link: https://lkml.kernel.org/r/20230227173632.3292573-9-surenb@xxxxxxxxxx
Link: https://lore.kernel.org/linux-mm/000000000000b0a65805f663ace6@xxxxxxxxxx/
Link: https://lkml.kernel.org/r/20230327185532.2354250-9-Liam.Howlett@xxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Fixes: d4af56c5c7c6 ("mm: start tracking VMAs with maple tree")
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Reported-by: syzbot+8d95422d3537159ca390@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mmap.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
--- a/mm/mmap.c~mm-enable-maple-tree-rcu-mode-by-default-v8
+++ a/mm/mmap.c
@@ -2277,8 +2277,7 @@ do_vmi_align_munmap(struct vma_iterator
int count = 0;
int error = -ENOMEM;
MA_STATE(mas_detach, &mt_detach, 0, 0);
- mt_init_flags(&mt_detach, vmi->mas.tree->ma_flags &
- (MT_FLAGS_LOCK_MASK | MT_FLAGS_USE_RCU));
+ mt_init_flags(&mt_detach, vmi->mas.tree->ma_flags & MT_FLAGS_LOCK_MASK);
mt_set_external_lock(&mt_detach, &mm->mmap_lock);
/*
_
Patches currently in -mm which might be from Liam.Howlett@xxxxxxxxxx are
mm-enable-maple-tree-rcu-mode-by-default-v8.patch
