The patch titled
Subject: epoll: fix suspicious RCU usage in ep_poll_callback
has been added to the -mm tree. Its filename is
epoll-use-rcu-to-protect-wakeup_source-in-epitem-fix.patch
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From: Eric Wong <normalperson@xxxxxxxx>
Subject: epoll: fix suspicious RCU usage in ep_poll_callback
The commit "epoll: use RCU to protect wakeup_source in epitem"
introduced the ep_pm_stay_awake_rcu function for ep_poll_callback
use, but I left it unused on accident. ep->mtx cannot be held in
ep_poll_callback, so RCU should be used here.
Signed-off-by: Eric Wong <normalperson@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/eventpoll.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN fs/eventpoll.c~epoll-use-rcu-to-protect-wakeup_source-in-epitem-fix fs/eventpoll.c
--- a/fs/eventpoll.c~epoll-use-rcu-to-protect-wakeup_source-in-epitem-fix
+++ a/fs/eventpoll.c
@@ -1049,7 +1049,7 @@ static int ep_poll_callback(wait_queue_t
/* If this file is already in the ready list we exit soon */
if (!ep_is_linked(&epi->rdllink)) {
list_add_tail(&epi->rdllink, &ep->rdllist);
- ep_pm_stay_awake(epi);
+ ep_pm_stay_awake_rcu(epi);
}
/*
_
Patches currently in -mm which might be from normalperson@xxxxxxxx are
epoll-trim-epitem-by-one-cache-line-on-x86_64.patch
epoll-trim-epitem-by-one-cache-line-on-x86_64-fix.patch
epoll-trim-epitem-by-one-cache-line-on-x86_64-fix-fix.patch
epoll-use-rcu-to-protect-wakeup_source-in-epitem.patch
epoll-use-rcu-to-protect-wakeup_source-in-epitem-fix.patch
epoll-lock-ep-mtx-in-ep_free-to-silence-lockdep.patch
epoll-cleanup-hoist-out-f_op-poll-calls.patch
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