Merge pull request #4811 from embassy-rs/fix-trace

executor: fix build with 'trace' on.

Author: Dirbaio

embassy-executor/Cargo.toml

@@ -30,13 +30,15 @@ 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-cortex-m", "executor-interrupt", "executor-thread", "embassy-time-driver", "scheduler-priority", "scheduler-deadline", "trace"]},
     {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"]},
     {target = "riscv32imac-unknown-none-elf", features = ["arch-riscv32"]},
     {target = "riscv32imac-unknown-none-elf", features = ["arch-riscv32", "executor-thread"]},
+    {target = "riscv32imac-unknown-none-elf", features = ["arch-riscv32", "executor-thread", "trace"]},
     # Nightly builds
     {group = "nightly", target = "thumbv7em-none-eabi", features = ["nightly"]},
     {group = "nightly", target = "thumbv7em-none-eabi", features = ["nightly", "log"]},

embassy-executor/src/raw/trace.rs

@@ -169,7 +169,7 @@ impl TaskTracker {
 }
 
 #[cfg(feature = "trace")]
-extern "Rust" {
+unsafe extern "Rust" {
     /// This callback is called when the executor begins polling. This will always
     /// be paired with a later call to `_embassy_trace_executor_idle`.
     ///