diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d4bf03933..88636d863 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -439,9 +439,6 @@ jobs:
           - target: armv7-unknown-linux-gnueabihf
           - target: aarch64-unknown-linux-gnu
             rustflags: --cfg tokio_taskdump
-
-          # Run a platform without AtomicU64 and no const Mutex::new
-          - target: armv5te-unknown-linux-gnueabi
     steps:
       - uses: actions/checkout@v3
       - name: Install Rust stable
@@ -464,10 +461,10 @@ jobs:
         run: |
           set -euxo pipefail
           cargo nextest run -p tokio --all-features --target ${{ matrix.target }}
-          cargo test --doc -p tokio --all-features --target ${{ matrix.target }} -- --test-threads 1
+          cargo test --doc -p tokio --all-features --target ${{ matrix.target }}
         env:
           RUST_TEST_THREADS: 1
-          RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_ipv6 --cfg tokio_no_tuning_tests ${{ matrix.rustflags }}
+          RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_tuning_tests ${{ matrix.rustflags }}
 
   cross-test-without-parking_lot:
     needs: basics
@@ -481,9 +478,6 @@ jobs:
           - target: armv7-unknown-linux-gnueabihf
           - target: aarch64-unknown-linux-gnu
             rustflags: --cfg tokio_taskdump
-
-          # Run a platform without AtomicU64 and no const Mutex::new
-          - target: armv5te-unknown-linux-gnueabi
     steps:
       - uses: actions/checkout@v3
       - name: Install Rust stable
@@ -510,10 +504,10 @@ jobs:
         run: |
           set -euxo pipefail
           cargo nextest run -p tokio --features full,test-util --target ${{ matrix.target }}
-          cargo test --doc -p tokio --features full,test-util --target ${{ matrix.target }} -- --test-threads 1
+          cargo test --doc -p tokio --features full,test-util --target ${{ matrix.target }}
         env:
           RUST_TEST_THREADS: 1
-          RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_ipv6 --cfg tokio_no_parking_lot --cfg tokio_no_tuning_tests ${{ matrix.rustflags }}
+          RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_parking_lot --cfg tokio_no_tuning_tests ${{ matrix.rustflags }}
 
   # See https://github.com/tokio-rs/tokio/issues/5187
   no-atomic-u64-test:
@@ -541,10 +535,10 @@ jobs:
       - name: test tokio --all-features
         run: |
           cargo nextest run -Zbuild-std --target target-specs/i686-unknown-linux-gnu.json -p tokio --all-features
-          cargo test --doc -Zbuild-std --target target-specs/i686-unknown-linux-gnu.json -p tokio --all-features -- --test-threads 1
+          cargo test --doc -Zbuild-std --target target-specs/i686-unknown-linux-gnu.json -p tokio --all-features
         env:
           RUST_TEST_THREADS: 1
-          RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings --cfg tokio_no_atomic_u64 --cfg tokio_no_tuning_tests
+          RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings --cfg tokio_no_tuning_tests
 
   no-atomic-u64-check:
     name: Check tokio --feature-powerset --depth 2 on i686-unknown-linux-gnu without AtomicU64
@@ -566,10 +560,10 @@ jobs:
 
       # https://github.com/tokio-rs/tokio/pull/5356
       # https://github.com/tokio-rs/tokio/issues/5373
-      - name: Check with const_mutex_new
-        run: cargo hack check -p tokio --feature-powerset --depth 2 --keep-going
+      - name: Check
+        run: cargo hack check -Zbuild-std --target target-specs/i686-unknown-linux-gnu.json -p tokio --feature-powerset --depth 2 --keep-going
         env:
-          RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings --cfg tokio_no_atomic_u64
+          RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings
 
   features:
     name: features ${{ matrix.name }}
@@ -823,7 +817,7 @@ jobs:
         with:
           toolchain: ${{ env.rust_stable }}
       - name: Install wasm-pack
-        run: curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh
+        uses: taiki-e/install-action@wasm-pack
 
       - uses: Swatinem/rust-cache@v2
       - name: test tokio
diff --git a/.github/workflows/labeler.yml b/.github/workflows/labeler.yml
index 28824cff6..bb392bdf9 100644
--- a/.github/workflows/labeler.yml
+++ b/.github/workflows/labeler.yml
@@ -4,6 +4,10 @@ on:
 
 # See .github/labeler.yml file
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: true
+
 permissions:
   contents: read
 
diff --git a/.github/workflows/loom.yml b/.github/workflows/loom.yml
index 3952dfe5d..efd0eb326 100644
--- a/.github/workflows/loom.yml
+++ b/.github/workflows/loom.yml
@@ -7,6 +7,10 @@ on:
 
 name: Loom
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: true
+
 env:
   RUSTFLAGS: -Dwarnings --cfg loom --cfg tokio_unstable -C debug_assertions
   LOOM_MAX_PREEMPTIONS: 2
diff --git a/.github/workflows/pr-audit.yml b/.github/workflows/pr-audit.yml
index d6f798292..892cb0cfa 100644
--- a/.github/workflows/pr-audit.yml
+++ b/.github/workflows/pr-audit.yml
@@ -8,6 +8,10 @@ on:
     paths:
       - '**/Cargo.toml'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: true
+
 permissions:
   contents: read
 
diff --git a/.github/workflows/stress-test.yml b/.github/workflows/stress-test.yml
index 5bd1fcd7d..1c21bc914 100644
--- a/.github/workflows/stress-test.yml
+++ b/.github/workflows/stress-test.yml
@@ -5,6 +5,10 @@ on:
     branches:
       - master
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: true
+
 env:
   RUSTFLAGS: -Dwarnings
   RUST_BACKTRACE: 1
diff --git a/tokio/src/loom/std/parking_lot.rs b/tokio/src/loom/std/parking_lot.rs
index e3af258d1..9b9a81d35 100644
--- a/tokio/src/loom/std/parking_lot.rs
+++ b/tokio/src/loom/std/parking_lot.rs
@@ -52,8 +52,7 @@ impl<T> Mutex<T> {
     }
 
     #[inline]
-    #[cfg(all(feature = "parking_lot", not(all(loom, test))))]
-    #[cfg_attr(docsrs, doc(cfg(all(feature = "parking_lot",))))]
+    #[cfg(not(all(loom, test)))]
     pub(crate) const fn const_new(t: T) -> Mutex<T> {
         Mutex(PhantomData, parking_lot::const_mutex(t))
     }
diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs
index 2862e1f55..443cc14b3 100644
--- a/tokio/src/macros/cfg.rs
+++ b/tokio/src/macros/cfg.rs
@@ -523,7 +523,7 @@ macro_rules! cfg_not_coop {
 macro_rules! cfg_has_atomic_u64 {
     ($($item:item)*) => {
         $(
-            #[cfg(all(target_has_atomic = "64", not(tokio_no_atomic_u64)))]
+            #[cfg(target_has_atomic = "64")]
             $item
         )*
     }
@@ -532,7 +532,7 @@ macro_rules! cfg_has_atomic_u64 {
 macro_rules! cfg_not_has_atomic_u64 {
     ($($item:item)*) => {
         $(
-            #[cfg(any(not(target_has_atomic = "64"), tokio_no_atomic_u64))]
+            #[cfg(not(target_has_atomic = "64"))]
             $item
         )*
     }
diff --git a/tokio/tests/tcp_connect.rs b/tokio/tests/tcp_connect.rs
index 03f7b34ff..269ba8ef6 100644
--- a/tokio/tests/tcp_connect.rs
+++ b/tokio/tests/tcp_connect.rs
@@ -35,7 +35,6 @@ async fn connect_v4() {
 }
 
 #[tokio::test]
-#[cfg(not(tokio_no_ipv6))]
 async fn connect_v6() {
     let srv = assert_ok!(TcpListener::bind("[::1]:0").await);
     let addr = assert_ok!(srv.local_addr());
diff --git a/tokio/tests/tcp_socket.rs b/tokio/tests/tcp_socket.rs
index b431196f1..faead95c0 100644
--- a/tokio/tests/tcp_socket.rs
+++ b/tokio/tests/tcp_socket.rs
@@ -24,7 +24,6 @@ async fn basic_usage_v4() {
 }
 
 #[tokio::test]
-#[cfg(not(tokio_no_ipv6))]
 async fn basic_usage_v6() {
     // Create server
     let addr = assert_ok!("[::1]:0".parse());