Clamp permit count Semaphore::const_new

tokio/src/sync/batch_semaphore.rs

@@ -126,9 +126,17 @@ impl Semaphore {
     /// Creates a new semaphore with the initial number of permits
     ///
     /// Maximum number of permits on 32-bit platforms is `1<<29`.
-    #[cfg(all(feature = "parking_lot", not(all(loom, test)),))]
-    pub(crate) const fn const_new(permits: usize) -> Self {
-        // FIXME: assertions and by extension panics are still being worked on: https://github.com/rust-lang/rust/issues/74925
+    ///
+    /// If the specified number of permits exceeds the maximum permit amount
+    /// Then the value will get clamped to the maximum number of permits.
+    #[cfg(all(feature = "parking_lot", not(all(loom, test))))]
+    pub(crate) const fn const_new(mut permits: usize) -> Self {
+        if permits > Self::MAX_PERMITS {
+            // NOTE: assertions and by extension panics are still being worked on: https://github.com/rust-lang/rust/issues/74925
+            // currently we just clamp the permit count when it exceeds the max
+            permits = Self::MAX_PERMITS;
+        }
+
         Self {
             permits: AtomicUsize::new(permits << Self::PERMIT_SHIFT),
             waiters: Mutex::const_new(Waitlist {

tokio/src/util/linked_list.rs

@@ -72,7 +72,6 @@ unsafe impl<T: Sync> Sync for Pointers<T> {}
 
 impl<L, T> LinkedList<L, T> {
     /// Creates an empty linked list.
-    #[allow(dead_code)] // NOTE: This will get removed with: https://github.com/tokio-rs/tokio/pull/2790
     pub(crate) const fn new() -> LinkedList<L, T> {
         LinkedList {
             head: None,