From bf3debe9d776a6eeda48e4c063ab6798d066fc4e Mon Sep 17 00:00:00 2001
From: Mara Bos <m-ou.se@m-ou.se>
Date: Tue, 19 Mar 2024 14:57:19 +0100
Subject: [PATCH] SeqCst->Relaxed for proc_macro bridge counter.

Relaxed is enough here.
---
 library/proc_macro/src/bridge/handle.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/library/proc_macro/src/bridge/handle.rs b/library/proc_macro/src/bridge/handle.rs
index 894acae217e4..8c53bb609f60 100644
--- a/library/proc_macro/src/bridge/handle.rs
+++ b/library/proc_macro/src/bridge/handle.rs
@@ -21,7 +21,7 @@ impl<T> OwnedStore<T> {
     pub(super) fn new(counter: &'static AtomicU32) -> Self {
         // Ensure the handle counter isn't 0, which would panic later,
         // when `NonZero::new` (aka `Handle::new`) is called in `alloc`.
-        assert_ne!(counter.load(Ordering::SeqCst), 0);
+        assert_ne!(counter.load(Ordering::Relaxed), 0);
 
         OwnedStore { counter, data: BTreeMap::new() }
     }
@@ -29,7 +29,7 @@ impl<T> OwnedStore<T> {
 
 impl<T> OwnedStore<T> {
     pub(super) fn alloc(&mut self, x: T) -> Handle {
-        let counter = self.counter.fetch_add(1, Ordering::SeqCst);
+        let counter = self.counter.fetch_add(1, Ordering::Relaxed);
         let handle = Handle::new(counter).expect("`proc_macro` handle counter overflowed");
         assert!(self.data.insert(handle, x).is_none());
         handle