apply review

Cargo.toml

@@ -21,14 +21,14 @@ categories = ["network-programming", "data-structures"]
 [features]
 default = ["std"]
 std = []
-# Use portable-atomic crate to support platforms without atomic CAS.
-# See https://docs.rs/portable-atomic for more information.
-extra-platforms = ["portable-atomic"]
 
 [dependencies]
 serde = { version = "1.0.60", optional = true, default-features = false, features = ["alloc"] }
+# Use portable-atomic crate to support platforms without atomic CAS.
+# See "no_std support" section in readme for more information.
+#
 # Enable require-cas feature to provide a better error message if the end user forgets to use the cfg or feature.
-portable-atomic = { version = "1.3", optional = true, default-features = false, features = ["require-cas"] }
+extra-platforms = { package = "portable-atomic", version = "1.3", optional = true, default-features = false, features = ["require-cas"] }
 
 [dev-dependencies]
 serde_test = "1.0"

README.md

@@ -40,6 +40,8 @@ To use `bytes` with no_std environment without atomic CAS, such as thumbv6m, you
 the `extra-platforms` feature. See the [documentation for the `portable-atomic`
 crate](https://docs.rs/portable-atomic) for more information.
 
+The MSRV when `extra-platforms` feature is enabled depends on the MSRV of `portable-atomic`.
+
 ## Serde support
 
 Serde support is optional and disabled by default. To enable use the feature `serde`.
@@ -49,6 +51,8 @@ Serde support is optional and disabled by default. To enable use the feature `se
 bytes = { version = "1", features = ["serde"] }
 ```
 
+The MSRV when `serde` feature is enabled depends on the MSRV of `serde`.
+
 ## Building documentation
 
 When building the `bytes` documentation the `docsrs` option should be used, otherwise

src/loom.rs

@@ -4,7 +4,7 @@ pub(crate) mod sync {
         #[cfg(not(feature = "extra-platforms"))]
         pub(crate) use core::sync::atomic::{AtomicPtr, AtomicUsize, Ordering};
         #[cfg(feature = "extra-platforms")]
-        pub(crate) use portable_atomic::{AtomicPtr, AtomicUsize, Ordering};
+        pub(crate) use extra_platforms::{AtomicPtr, AtomicUsize, Ordering};
 
         pub(crate) trait AtomicMut<T> {
             fn with_mut<F, R>(&mut self, f: F) -> R