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Most processes do not use Rust Binder with epoll, so avoid paying the synchronize_rcu() cost in drop for those that don't need it. For those that do, we also manage to replace synchronize_rcu() with kfree_rcu(), though we introduce an extra allocation. In case the last ref to an Arc<Thread> is dropped outside of deferred_release(), this also ensures that synchronize_rcu() is not called in destructor of Arc<Thread> in other places. Theoretically that could lead to jank by making other syscalls slow, which would be problematic. Signed-off-by: Alice Ryhl <aliceryhl@google.com> Reviewed-by: Boqun Feng <boqun@kernel.org> Link: https://patch.msgid.link/20260707-upgrade-poll-v6-2-4b8fae7bf1d9@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>