The patch below does not apply to the 6.2-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.2.y git checkout FETCH_HEAD git cherry-pick -x 8372f4d83f96f35915106093cde4565836587123 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023041120-outbid-gloomy-afbe@gregkh' --subject-prefix 'PATCH 6.2.y' HEAD^..

Possible dependencies:

8372f4d83f96 ("maple_tree: remove extra smp_wmb() from mas_dead_leaves()")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 8372f4d83f96f35915106093cde4565836587123 Mon Sep 17 00:00:00 2001 From: Liam Howlett Liam.Howlett@oracle.com Date: Mon, 27 Feb 2023 09:36:03 -0800 Subject: [PATCH] maple_tree: remove extra smp_wmb() from mas_dead_leaves()

The call to mte_set_dead_node() before the smp_wmb() already calls smp_wmb() so this is not needed. This is an optimization for the RCU mode of the maple tree.

Link: https://lkml.kernel.org/r/20230227173632.3292573-5-surenb@google.com Fixes: 54a611b60590 ("Maple Tree: add new data structure") Signed-off-by: Liam Howlett Liam.Howlett@oracle.com Signed-off-by: Suren Baghdasaryan surenb@google.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org

diff --git a/lib/maple_tree.c b/lib/maple_tree.c index 946acda29521..96d673e4ba5b 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -5503,7 +5503,6 @@ unsigned char mas_dead_leaves(struct ma_state *mas, void __rcu **slots, break;

mte_set_node_dead(entry); - smp_wmb(); /* Needed for RCU */ node->type = type; rcu_assign_pointer(slots[offset], node); }