CR Feedback: replace cfg_rt with a dead code attr

tokio/src/util/metric_atomics.rs

@@ -46,31 +46,30 @@ impl MetricAtomicU64 {
     }
 }
 
-cfg_rt! {
-    /// `AtomicUsize` for use in metrics.
-    ///
-    /// This exposes simplified APIs for use in metrics & uses `std::sync` instead of Loom to avoid polluting loom logs with metric information.
-    #[derive(Debug, Default)]
-    pub(crate) struct MetricAtomicUsize {
-        value: std::sync::atomic::AtomicUsize,
-    }
+#[cfg_attr(not(all(tokio_unstable, feature = "rt")), allow(dead_code))]
+/// `AtomicUsize` for use in metrics.
+///
+/// This exposes simplified APIs for use in metrics & uses `std::sync` instead of Loom to avoid polluting loom logs with metric information.
+#[derive(Debug, Default)]
+pub(crate) struct MetricAtomicUsize {
+    value: std::sync::atomic::AtomicUsize,
+}
 
-    #[cfg_attr(not(tokio_unstable), allow(dead_code))]
-    impl MetricAtomicUsize {
-        pub(crate) fn load(&self, ordering: Ordering) -> usize {
-            self.value.load(ordering)
-        }
+#[cfg_attr(not(all(tokio_unstable, feature = "rt")), allow(dead_code))]
+impl MetricAtomicUsize {
+    pub(crate) fn load(&self, ordering: Ordering) -> usize {
+        self.value.load(ordering)
+    }
 
-        pub(crate) fn store(&self, val: usize, ordering: Ordering) {
-            self.value.store(val, ordering)
-        }
+    pub(crate) fn store(&self, val: usize, ordering: Ordering) {
+        self.value.store(val, ordering)
+    }
 
-        pub(crate) fn increment(&self) -> usize {
-            self.value.fetch_add(1, Ordering::Relaxed)
-        }
+    pub(crate) fn increment(&self) -> usize {
+        self.value.fetch_add(1, Ordering::Relaxed)
+    }
 
-        pub(crate) fn decrement(&self) -> usize {
-            self.value.fetch_sub(1, Ordering::Relaxed)
-        }
+    pub(crate) fn decrement(&self) -> usize {
+        self.value.fetch_sub(1, Ordering::Relaxed)
     }
 }