From d7695a0ef6fb3874616d278ebc535cc77e24835a Mon Sep 17 00:00:00 2001
From: Frank Rehwinkel <frankrehwinkel@gmail.com>
Date: Wed, 2 Oct 2024 08:13:11 -0400
Subject: [PATCH] epoll: remove extraneous clone of ready_list

A simplification that doesn't impact the epoll implementation's logic.

It is not necessary to clone the ready_list before reading its
`is_empty` state.

This avoids the clone step but more importantly avoids the invisible
drop step of the clone.
---
 src/shims/unix/linux/epoll.rs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/shims/unix/linux/epoll.rs b/src/shims/unix/linux/epoll.rs
index 88fab8aa01..c4bd38c47e 100644
--- a/src/shims/unix/linux/epoll.rs
+++ b/src/shims/unix/linux/epoll.rs
@@ -475,8 +475,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
             let epoll_file_description = epfd
                 .downcast::<Epoll>()
                 .ok_or_else(|| err_unsup_format!("non-epoll FD passed to `epoll_wait`"))?;
-            let binding = epoll_file_description.get_ready_list();
-            ready_list_empty = binding.mapping.borrow_mut().is_empty();
+            ready_list_empty = epoll_file_description.ready_list.mapping.borrow().is_empty();
             thread_ids = epoll_file_description.thread_id.borrow_mut();
         }
         if timeout == 0 || !ready_list_empty {