eventpoll: prefer kfree_rcu() in __ep_remove()

In '__ep_remove()', prefer 'kfree_rcu()' over 'call_rcu()' with
dummy 'epi_rcu_free()' callback. This follows commit d0089603fa7a
("fs: prefer kfree_rcu() in fasync_remove_entry()") and should not
be backported to stable as well.

Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Link: https://lore.kernel.org/r/20240221112205.48389-2-dmantipov@yandex.ru
Signed-off-by: Christian Brauner <brauner@kernel.org>

diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 786e023a48b2f80373d602bb3a784797db1f6718..39ac6fdf8bcab38533b3c2f4e5b4bb97ed3432fa 100644 (file)
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -678,12 +678,6 @@ static void ep_done_scan(struct eventpoll *ep,
        write_unlock_irq(&ep->lock);
 }
 
-static void epi_rcu_free(struct rcu_head *head)
-{
-       struct epitem *epi = container_of(head, struct epitem, rcu);
-       kmem_cache_free(epi_cache, epi);
-}
-
 static void ep_get(struct eventpoll *ep)
 {
        refcount_inc(&ep->refcount);
@@ -767,7 +761,7 @@ static bool __ep_remove(struct eventpoll *ep, struct epitem *epi, bool force)
         * ep->mtx. The rcu read side, reverse_path_check_proc(), does not make
         * use of the rbn field.
         */
-       call_rcu(&epi->rcu, epi_rcu_free);
+       kfree_rcu(epi, rcu);
 
        percpu_counter_dec(&ep->user->epoll_watches);
        return ep_refcount_dec_and_test(ep);