Merge remote-tracking branch 'upstream/master' into allocator_api

Author: rmja

.github/bors.toml

@@ -1,7 +1,9 @@
 on:
-  push:
-    branches: [ staging, trying, master ]
-  pull_request:
+  push: # Run CI for all branches except GitHub merge queue tmp branches
+    branches-ignore:
+    - "gh-readonly-queue/**"
+  pull_request: # Run CI for PRs on any branch
+  merge_group: # Run CI for the GitHub merge queue
 
 name: Continuous integration
 

.github/workflows/ci.yml

@@ -1,7 +1,9 @@
 on:
-  push:
-    branches: [ staging, trying, master ]
-  pull_request_target:
+  push: # Run CI for all branches except GitHub merge queue tmp branches
+    branches-ignore:
+    - "gh-readonly-queue/**"
+  pull_request: # Run CI for PRs on any branch
+  merge_group: # Run CI for the GitHub merge queue
 
 name: Clippy check
 

.github/workflows/clippy.yml

@@ -1,7 +1,9 @@
 on:
-  push:
-    branches: [ staging, trying, master ]
-  pull_request:
+  push: # Run CI for all branches except GitHub merge queue tmp branches
+    branches-ignore:
+    - "gh-readonly-queue/**"
+  pull_request: # Run CI for PRs on any branch
+  merge_group: # Run CI for the GitHub merge queue
 
 name: Code formatting check
 

.github/workflows/rustfmt.yml

@@ -46,6 +46,12 @@ fn main() -> ! {
 
 For a full usage example, see [`examples/global_alloc.rs`](https://github.com/rust-embedded/embedded-alloc/blob/master/examples/global_alloc.rs).
 
+For this to work, an implementation of [`critical-section`](https://github.com/rust-embedded/critical-section) must be provided.
+
+For simple use cases you may enable the `critical-section-single-core` feature in the [cortex-m](https://github.com/rust-embedded/cortex-m) crate.
+Please refer to the documentation of [`critical-section`](https://docs.rs/critical-section) for further guidance.
+
+
 ## License
 
 Licensed under either of