The patch titled
Subject: epoll-ep_autoremove_wake_function-should-use-list_del_init_careful-fix
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
epoll-ep_autoremove_wake_function-should-use-list_del_init_careful-fix.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/epoll-ep_autoremove_wake_function-should-use-list_del_init_careful-fix.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Benjamin Segall <bsegall@xxxxxxxxxx>
Subject: epoll-ep_autoremove_wake_function-should-use-list_del_init_careful-fix
Date: Wed, 31 May 2023 16:24:20 -0700
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Link: https://lkml.kernel.org/r/xm26bki0ulsr.fsf_-_@xxxxxxxxxx
Fixes: a16ceb139610 ("epoll: autoremove wakers even more aggressively")
Signed-off-by: Ben Segall <bsegall@xxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Christian Brauner <brauner@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/eventpoll.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/fs/eventpoll.c~epoll-ep_autoremove_wake_function-should-use-list_del_init_careful-fix
+++ a/fs/eventpoll.c
@@ -1805,6 +1805,10 @@ static int ep_autoremove_wake_function(s
{
int ret = default_wake_function(wq_entry, mode, sync, key);
+ /*
+ * 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@xxxxxxxxxx are
epoll-ep_autoremove_wake_function-should-use-list_del_init_careful.patch
epoll-ep_autoremove_wake_function-should-use-list_del_init_careful-fix.patch
