+ mm-enable-maple-tree-rcu-mode-by-default-v8.patch added to mm-unstable branch

+ mm-enable-maple-tree-rcu-mode-by-default-v8.patch added to mm-unstable branch

[Andrew Morton]

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

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
From: "Liam R. Howlett" <Liam.Howlett@Oracle.com>
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@google.com
Link: https://lore.kernel.org/linux-mm/000000000000b0a65805f663ace6@google.com/
Link: https://lkml.kernel.org/r/20230327185532.2354250-9-Liam.Howlett@oracle.com
Cc: stable@vger.kernel.org
Fixes: d4af56c5c7c6 ("mm: start tracking VMAs with maple tree")
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Reported-by: syzbot+8d95422d3537159ca390@syzkaller.appspotmail.com
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 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@Oracle.com are

mm-enable-maple-tree-rcu-mode-by-default-v8.patch