[merged mm-hotfixes-stable] epoll-ep_autoremove_wake_function-should-use-list_del_init_careful.patch removed from -mm tree

[merged mm-hotfixes-stable] epoll-ep_autoremove_wake_function-should-use-list_del_init_careful.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: epoll: ep_autoremove_wake_function should use list_del_init_careful
has been removed from the -mm tree.  Its filename was
     epoll-ep_autoremove_wake_function-should-use-list_del_init_careful.patch

This patch was dropped because it was merged into the mm-hotfixes-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Benjamin Segall <bsegall@google.com>
Subject: epoll: ep_autoremove_wake_function should use list_del_init_careful
Date: Tue, 30 May 2023 11:32:28 -0700

autoremove_wake_function uses list_del_init_careful, so should epoll's
more aggressive variant.  It only doesn't because it was copied from an
older wait.c rather than the most recent.

[bsegall@google.com: add comment]
  Link: https://lkml.kernel.org/r/xm26bki0ulsr.fsf_-_@google.com
Link: https://lkml.kernel.org/r/xm26pm6hvfer.fsf@google.com
Fixes: a16ceb139610 ("epoll: autoremove wakers even more aggressively")
Signed-off-by: Ben Segall <bsegall@google.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/eventpoll.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/fs/eventpoll.c~epoll-ep_autoremove_wake_function-should-use-list_del_init_careful
+++ a/fs/eventpoll.c
@@ -1805,7 +1805,11 @@ static int ep_autoremove_wake_function(s
 {
 	int ret = default_wake_function(wq_entry, mode, sync, key);
 
-	list_del_init(&wq_entry->entry);
+	/*
+	 * Pairs with list_empty_careful in ep_poll, and ensures future loop
+	 * iterations see the cause of this wakeup.
+	 */
+	list_del_init_careful(&wq_entry->entry);
 	return ret;
 }
 
_

Patches currently in -mm which might be from bsegall@google.com are