From 839edd35a42595c184d95a9bd5a46adcce324629 Mon Sep 17 00:00:00 2001
From: Brooks Prumo <brooks@solana.com>
Date: Thu, 7 Oct 2021 13:32:40 -0500
Subject: [PATCH] Correctly constrain BucketStorage Header's memory ordering
 (#20507)

---
 bucket_map/src/bucket_storage.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/bucket_map/src/bucket_storage.rs b/bucket_map/src/bucket_storage.rs
index 4f091e557..38d0f3d97 100644
--- a/bucket_map/src/bucket_storage.rs
+++ b/bucket_map/src/bucket_storage.rs
@@ -46,13 +46,13 @@ impl Header {
         Ok(UID_UNLOCKED)
             == self
                 .lock
-                .compare_exchange(UID_UNLOCKED, uid, Ordering::Acquire, Ordering::Relaxed)
+                .compare_exchange(UID_UNLOCKED, uid, Ordering::AcqRel, Ordering::Relaxed)
     }
     fn unlock(&self) -> Uid {
         self.lock.swap(UID_UNLOCKED, Ordering::Release)
     }
     fn uid(&self) -> Uid {
-        self.lock.load(Ordering::Relaxed)
+        self.lock.load(Ordering::Acquire)
     }
 }