From 70855b24b89e348aef0e28a0fe6db6d5bf19d11e Mon Sep 17 00:00:00 2001
From: luojia65 <me@luojia.cc>
Date: Sun, 5 Dec 2021 16:32:14 +0800
Subject: [PATCH 1/2] Add spin_loop hint for RISC-V architecture

This commit also updates `stdarch` git submodule.
---
 library/core/src/hint.rs | 5 +++++
 library/stdarch          | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/library/core/src/hint.rs b/library/core/src/hint.rs
index 95798879155c5..f49aefea81bac 100644
--- a/library/core/src/hint.rs
+++ b/library/core/src/hint.rs
@@ -137,6 +137,11 @@ pub fn spin_loop() {
             unsafe { crate::arch::arm::__yield() };
         }
     }
+
+    #[cfg(any(target_arch = "riscv32", target_arch = "riscv64"))]
+    {
+        crate::arch::riscv::pause();
+    }
 }
 
 /// An identity function that *__hints__* to the compiler to be maximally pessimistic about what
diff --git a/library/stdarch b/library/stdarch
index cfba59fccd90b..43b4556c44197 160000
--- a/library/stdarch
+++ b/library/stdarch
@@ -1 +1 @@
-Subproject commit cfba59fccd90b3b52a614120834320f764ab08d1
+Subproject commit 43b4556c44197af4ef82e42a12dfc513a1397f87

From 0ccf58b928c3197bb5531c422e3ad5c5bd899191 Mon Sep 17 00:00:00 2001
From: luojia65 <me@luojia.cc>
Date: Thu, 9 Dec 2021 22:33:25 +0800
Subject: [PATCH 2/2] Update stdarch dependency

---
 library/stdarch | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/library/stdarch b/library/stdarch
index 43b4556c44197..b70ae88ef2a6c 160000
--- a/library/stdarch
+++ b/library/stdarch
@@ -1 +1 @@
-Subproject commit 43b4556c44197af4ef82e42a12dfc513a1397f87
+Subproject commit b70ae88ef2a6c83acad0a1e83d5bd78f9655fd05