Use stabilized hint::spin_loop instead of deprecated atomic::spin_loop_hint

Author: phil-opp

Changelog.md

@@ -1,5 +1,7 @@
 # Unreleased
 
+- Use stabilized `hint::spin_loop` instead of deprecated `atomic::spin_loop_hint`
+
 # 0.2.10 – 2020-10-01
 
 - Fix default feature breakage ([#11](https://github.com/rust-osdev/uart_16550/pull/11))

src/lib.rs

@@ -27,7 +27,7 @@ use x86_64::instructions::port::Port;
 macro_rules! wait_for {
     ($cond:expr) => {
         while !$cond {
-            core::sync::atomic::spin_loop_hint()
+            core::hint::spin_loop()
         }
     };
 }