13 files changed, 17 insertions, 14 deletions

diff --git a/embassy-executor/Cargo.toml b/embassy-executor/Cargo.toml
index 6d11bc076..ecc4b6338 100644
--- a/embassy-executor/Cargo.toml
+++ b/embassy-executor/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "embassy-executor"
 version = "0.9.1"
-edition = "2021"
+edition = "2024"
 license = "MIT OR Apache-2.0"
 description = "async/await executor designed for embedded usage"
 repository = "https://github.com/embassy-rs/embassy"
@@ -30,6 +30,8 @@ build = [
     {target = "thumbv7em-none-eabi", features = ["arch-cortex-m", "executor-interrupt", "executor-thread", "embassy-time-driver", "scheduler-deadline"]},
     {target = "thumbv7em-none-eabi", features = ["arch-cortex-m", "executor-interrupt", "executor-thread", "scheduler-priority", "scheduler-deadline"]},
     {target = "thumbv7em-none-eabi", features = ["arch-cortex-m", "executor-interrupt", "executor-thread", "scheduler-deadline"]},
+    {target = "thumbv7em-none-eabi", features = ["arch-spin"]},
+    {target = "thumbv7em-none-eabi", features = ["arch-spin", "scheduler-deadline"]},
     {target = "armv7a-none-eabi", features = ["arch-cortex-ar", "executor-thread"]},
     {target = "armv7r-none-eabi", features = ["arch-cortex-ar", "executor-thread"]},
     {target = "armv7r-none-eabihf", features = ["arch-cortex-ar", "executor-thread"]},
diff --git a/embassy-executor/src/arch/avr.rs b/embassy-executor/src/arch/avr.rs
index 70085d04d..4a19c523a 100644
--- a/embassy-executor/src/arch/avr.rs
+++ b/embassy-executor/src/arch/avr.rs
@@ -14,7 +14,7 @@ mod thread {
 
     static SIGNAL_WORK_THREAD_MODE: AtomicBool = AtomicBool::new(false);
 
-    #[export_name = "__pender"]
+    #[unsafe(export_name = "__pender")]
     fn __pender(_context: *mut ()) {
         SIGNAL_WORK_THREAD_MODE.store(true, Ordering::SeqCst);
     }
diff --git a/embassy-executor/src/arch/cortex_ar.rs b/embassy-executor/src/arch/cortex_ar.rs
index f9e2f3f7c..36d45944a 100644
--- a/embassy-executor/src/arch/cortex_ar.rs
+++ b/embassy-executor/src/arch/cortex_ar.rs
@@ -1,7 +1,7 @@
 #[cfg(feature = "executor-interrupt")]
 compile_error!("`executor-interrupt` is not supported with `arch-cortex-ar`.");
 
-#[export_name = "__pender"]
+#[unsafe(export_name = "__pender")]
 #[cfg(any(feature = "executor-thread", feature = "executor-interrupt"))]
 fn __pender(context: *mut ()) {
     // `context` is always `usize::MAX` created by `Executor::run`.
diff --git a/embassy-executor/src/arch/cortex_m.rs b/embassy-executor/src/arch/cortex_m.rs
index 1c9ddd8a0..9f1081e93 100644
--- a/embassy-executor/src/arch/cortex_m.rs
+++ b/embassy-executor/src/arch/cortex_m.rs
@@ -1,4 +1,4 @@
-#[export_name = "__pender"]
+#[unsafe(export_name = "__pender")]
 #[cfg(any(feature = "executor-thread", feature = "executor-interrupt"))]
 fn __pender(context: *mut ()) {
     unsafe {
diff --git a/embassy-executor/src/arch/riscv32.rs b/embassy-executor/src/arch/riscv32.rs
index 01e63a9fd..13b93cf02 100644
--- a/embassy-executor/src/arch/riscv32.rs
+++ b/embassy-executor/src/arch/riscv32.rs
@@ -15,7 +15,7 @@ mod thread {
     /// global atomic used to keep track of whether there is work to do since sev() is not available on RISCV
     static SIGNAL_WORK_THREAD_MODE: AtomicBool = AtomicBool::new(false);
 
-    #[export_name = "__pender"]
+    #[unsafe(export_name = "__pender")]
     fn __pender(_context: *mut ()) {
         SIGNAL_WORK_THREAD_MODE.store(true, Ordering::SeqCst);
     }
diff --git a/embassy-executor/src/arch/spin.rs b/embassy-executor/src/arch/spin.rs
index 340023620..40cb56a09 100644
--- a/embassy-executor/src/arch/spin.rs
+++ b/embassy-executor/src/arch/spin.rs
@@ -11,7 +11,7 @@ mod thread {
 
     use crate::{raw, Spawner};
 
-    #[export_name = "__pender"]
+    #[unsafe(export_name = "__pender")]
     fn __pender(_context: *mut ()) {}
 
     /// Spin Executor
diff --git a/embassy-executor/src/arch/std.rs b/embassy-executor/src/arch/std.rs
index b02b15988..cdb9f7642 100644
--- a/embassy-executor/src/arch/std.rs
+++ b/embassy-executor/src/arch/std.rs
@@ -12,7 +12,7 @@ mod thread {
 
     use crate::{raw, Spawner};
 
-    #[export_name = "__pender"]
+    #[unsafe(export_name = "__pender")]
     fn __pender(context: *mut ()) {
         let signaler: &'static Signaler = unsafe { std::mem::transmute(context) };
         signaler.signal()
diff --git a/embassy-executor/src/arch/wasm.rs b/embassy-executor/src/arch/wasm.rs
index f9d0f935c..6b36f8a5b 100644
--- a/embassy-executor/src/arch/wasm.rs
+++ b/embassy-executor/src/arch/wasm.rs
@@ -15,7 +15,7 @@ mod thread {
     use crate::raw::util::UninitCell;
     use crate::{raw, Spawner};
 
-    #[export_name = "__pender"]
+    #[unsafe(export_name = "__pender")]
     fn __pender(context: *mut ()) {
         let signaler: &'static WasmContext = unsafe { std::mem::transmute(context) };
         let _ = signaler.promise.then(unsafe { signaler.closure.as_mut() });
diff --git a/embassy-executor/src/lib.rs b/embassy-executor/src/lib.rs
index e47b8eb9f..cffc76699 100644
--- a/embassy-executor/src/lib.rs
+++ b/embassy-executor/src/lib.rs
@@ -1,5 +1,6 @@
 #![cfg_attr(not(any(feature = "arch-std", feature = "arch-wasm")), no_std)]
 #![allow(clippy::new_without_default)]
+#![allow(unsafe_op_in_unsafe_fn)]
 #![doc = include_str!("../README.md")]
 #![warn(missing_docs)]
 
diff --git a/embassy-executor/src/raw/mod.rs b/embassy-executor/src/raw/mod.rs
index dbd70cbf4..ab845ed3b 100644
--- a/embassy-executor/src/raw/mod.rs
+++ b/embassy-executor/src/raw/mod.rs
@@ -52,7 +52,7 @@ pub use self::waker::task_from_waker;
 use super::SpawnToken;
 use crate::{Metadata, SpawnError};
 
-#[no_mangle]
+#[unsafe(no_mangle)]
 extern "Rust" fn __embassy_time_queue_item_from_waker(waker: &Waker) -> &'static mut TimerQueueItem {
     unsafe { task_from_waker(waker).timer_queue_item() }
 }
@@ -407,7 +407,7 @@ unsafe impl Sync for Pender {}
 
 impl Pender {
     pub(crate) fn pend(self) {
-        extern "Rust" {
+        unsafe extern "Rust" {
             fn __pender(context: *mut ());
         }
         unsafe { __pender(self.0) };
@@ -507,7 +507,7 @@ impl SyncExecutor {
 /// The pender function must be exported with the name `__pender` and have the following signature:
 ///
 /// ```rust
-/// #[export_name = "__pender"]
+/// #[unsafe(export_name = "__pender")]
 /// fn pender(context: *mut ()) {
 ///    // schedule `poll()` to be called
 /// }
diff --git a/embassy-executor/src/raw/waker_turbo.rs b/embassy-executor/src/raw/waker_turbo.rs
index 435a0ff7e..9d0ad35ec 100644
--- a/embassy-executor/src/raw/waker_turbo.rs
+++ b/embassy-executor/src/raw/waker_turbo.rs
@@ -26,7 +26,7 @@ pub fn task_from_waker(waker: &Waker) -> TaskRef {
 }
 
 #[inline(never)]
-#[no_mangle]
+#[unsafe(no_mangle)]
 fn _turbo_wake(ptr: NonNull<()>) {
     // safety: our wakers are always created with `TaskRef::as_ptr`
     let task = unsafe { TaskRef::from_ptr(ptr.as_ptr() as *const TaskHeader) };
diff --git a/embassy-executor/tests/test.rs b/embassy-executor/tests/test.rs
index 6baf3dc21..6c4783dc1 100644
--- a/embassy-executor/tests/test.rs
+++ b/embassy-executor/tests/test.rs
@@ -9,7 +9,7 @@ use std::task::Poll;
 use embassy_executor::raw::Executor;
 use embassy_executor::{task, Spawner};
 
-#[export_name = "__pender"]
+#[unsafe(export_name = "__pender")]
 fn __pender(context: *mut ()) {
     unsafe {
         let trace = &*(context as *const Trace);
diff --git a/embassy-executor/tests/ui/task_safety_attribute.rs b/embassy-executor/tests/ui/task_safety_attribute.rs
index ab5a2f99f..46a5c665f 100644
--- a/embassy-executor/tests/ui/task_safety_attribute.rs
+++ b/embassy-executor/tests/ui/task_safety_attribute.rs
@@ -9,7 +9,7 @@ async fn safe() {}
 #[embassy_executor::task]
 async unsafe fn not_safe() {}
 
-#[export_name = "__pender"]
+#[unsafe(export_name = "__pender")]
 fn pender(_: *mut ()) {
     // The test doesn't link if we don't include this.
     // We never call this anyway.