Rust fixes for v6.11 (2nd)

Toolchain and infrastructure:
 
  - Fix builds for nightly compiler users now that 'new_uninit' was split
    into new features by using an alternative approach for the code that
    used what is now called the 'box_uninit_write' feature.
 
  - Allow the 'stable_features' lint to preempt upcoming warnings about
    them, since soon there will be unstable features that will become
    stable in nightly compilers.
 
  - Export bss symbols too.
 
 'kernel' crate:
 
  - 'block' module: fix wrong usage of lockdep API.
 
 'macros' crate:
 
  - Provide correct provenance when constructing 'THIS_MODULE'.
 
 Documentation:
 
  - Remove unintended indentation (blockquotes) in generated output.
 
  - Fix a couple typos.
 
 MAINTAINERS:
 
  - Remove Wedson as Rust maintainer.
 
  - Update Andreas' email.
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Merge tag 'rust-fixes-6.11-2' of https://github.com/Rust-for-Linux/linux

Pull Rust fixes from Miguel Ojeda:
 "Toolchain and infrastructure:

   - Fix builds for nightly compiler users now that 'new_uninit' was
     split into new features by using an alternative approach for the
     code that used what is now called the 'box_uninit_write' feature

   - Allow the 'stable_features' lint to preempt upcoming warnings about
     them, since soon there will be unstable features that will become
     stable in nightly compilers

   - Export bss symbols too

  'kernel' crate:

   - 'block' module: fix wrong usage of lockdep API

  'macros' crate:

   - Provide correct provenance when constructing 'THIS_MODULE'

  Documentation:

   - Remove unintended indentation (blockquotes) in generated output

   - Fix a couple typos

  MAINTAINERS:

   - Remove Wedson as Rust maintainer

   - Update Andreas' email"

* tag 'rust-fixes-6.11-2' of https://github.com/Rust-for-Linux/linux:
  MAINTAINERS: update Andreas Hindborg's email address
  MAINTAINERS: Remove Wedson as Rust maintainer
  rust: macros: provide correct provenance when constructing THIS_MODULE
  rust: allow `stable_features` lint
  docs: rust: remove unintended blockquote in Quick Start
  rust: alloc: eschew `Box<MaybeUninit<T>>::write`
  rust: kernel: fix typos in code comments
  docs: rust: remove unintended blockquote in Coding Guidelines
  rust: block: fix wrong usage of lockdep API
  rust: kbuild: fix export of bss symbols

.mailmap

@@ -60,6 +60,7 @@ Amit Nischal <quic_anischal@quicinc.com> <anischal@codeaurora.org>
 Andi Kleen <ak@linux.intel.com> <ak@suse.de>
 Andi Shyti <andi@etezian.org> <andi.shyti@samsung.com>
 Andreas Herrmann <aherrman@de.ibm.com>
+Andreas Hindborg <a.hindborg@kernel.org> <a.hindborg@samsung.com>
 Andrej Shadura <andrew.shadura@collabora.co.uk>
 Andrej Shadura <andrew@shadura.me> <andrew@beldisplaytech.com>
 Andrew Morton <akpm@linux-foundation.org>

Documentation/rust/coding-guidelines.rst

@@ -145,32 +145,32 @@ This is how a well-documented Rust function may look like:
 This example showcases a few ``rustdoc`` features and some conventions followed
 in the kernel:
 
-  - The first paragraph must be a single sentence briefly describing what
+- The first paragraph must be a single sentence briefly describing what
-    the documented item does. Further explanations must go in extra paragraphs.
+  the documented item does. Further explanations must go in extra paragraphs.
 
-  - Unsafe functions must document their safety preconditions under
+- Unsafe functions must document their safety preconditions under
-    a ``# Safety`` section.
+  a ``# Safety`` section.
 
-  - While not shown here, if a function may panic, the conditions under which
+- While not shown here, if a function may panic, the conditions under which
-    that happens must be described under a ``# Panics`` section.
+  that happens must be described under a ``# Panics`` section.
 
-    Please note that panicking should be very rare and used only with a good
+  Please note that panicking should be very rare and used only with a good
-    reason. In almost all cases, a fallible approach should be used, typically
+  reason. In almost all cases, a fallible approach should be used, typically
-    returning a ``Result``.
+  returning a ``Result``.
 
-  - If providing examples of usage would help readers, they must be written in
+- If providing examples of usage would help readers, they must be written in
-    a section called ``# Examples``.
+  a section called ``# Examples``.
 
-  - Rust items (functions, types, constants...) must be linked appropriately
+- Rust items (functions, types, constants...) must be linked appropriately
-    (``rustdoc`` will create a link automatically).
+  (``rustdoc`` will create a link automatically).
 
-  - Any ``unsafe`` block must be preceded by a ``// SAFETY:`` comment
+- Any ``unsafe`` block must be preceded by a ``// SAFETY:`` comment
-    describing why the code inside is sound.
+  describing why the code inside is sound.
 
-    While sometimes the reason might look trivial and therefore unneeded,
+  While sometimes the reason might look trivial and therefore unneeded,
-    writing these comments is not just a good way of documenting what has been
+  writing these comments is not just a good way of documenting what has been
-    taken into account, but most importantly, it provides a way to know that
+  taken into account, but most importantly, it provides a way to know that
-    there are no *extra* implicit constraints.
+  there are no *extra* implicit constraints.
 
 To learn more about how to write documentation for Rust and extra features,
 please take a look at the ``rustdoc`` book at:

Documentation/rust/quick-start.rst

@@ -305,7 +305,7 @@ If GDB/Binutils is used and Rust symbols are not getting demangled, the reason
 is the toolchain does not support Rust's new v0 mangling scheme yet.
 There are a few ways out:
 
-  - Install a newer release (GDB >= 10.2, Binutils >= 2.36).
+- Install a newer release (GDB >= 10.2, Binutils >= 2.36).
 
-  - Some versions of GDB (e.g. vanilla GDB 10.1) are able to use
+- Some versions of GDB (e.g. vanilla GDB 10.1) are able to use
-    the pre-demangled names embedded in the debug info (``CONFIG_DEBUG_INFO``).
+  the pre-demangled names embedded in the debug info (``CONFIG_DEBUG_INFO``).

MAINTAINERS

@@ -3868,7 +3868,7 @@ F:	kernel/trace/blktrace.c
 F:	lib/sbitmap.c
 
 BLOCK LAYER DEVICE DRIVER API [RUST]
-M:	Andreas Hindborg <a.hindborg@samsung.com>
+M:	Andreas Hindborg <a.hindborg@kernel.org>
 R:	Boqun Feng <boqun.feng@gmail.com>
 L:	linux-block@vger.kernel.org
 L:	rust-for-linux@vger.kernel.org
@@ -19932,12 +19932,11 @@ F:	tools/verification/
 RUST
 M:	Miguel Ojeda <ojeda@kernel.org>
 M:	Alex Gaynor <alex.gaynor@gmail.com>
-M:	Wedson Almeida Filho <wedsonaf@gmail.com>
 R:	Boqun Feng <boqun.feng@gmail.com>
 R:	Gary Guo <gary@garyguo.net>
 R:	Björn Roy Baron <bjorn3_gh@protonmail.com>
 R:	Benno Lossin <benno.lossin@proton.me>
-R:	Andreas Hindborg <a.hindborg@samsung.com>
+R:	Andreas Hindborg <a.hindborg@kernel.org>
 R:	Alice Ryhl <aliceryhl@google.com>
 L:	rust-for-linux@vger.kernel.org
 S:	Supported

Makefile

@@ -445,6 +445,7 @@ KBUILD_USERLDFLAGS := $(USERLDFLAGS)
 # host programs.
 export rust_common_flags := --edition=2021 \
 			    -Zbinary_dep_depinfo=y \
+			    -Astable_features \
 			    -Dunsafe_op_in_unsafe_fn \
 			    -Dnon_ascii_idents \
 			    -Wrust_2018_idioms \

rust/Makefile

@@ -305,7 +305,7 @@ $(obj)/bindings/bindings_helpers_generated.rs: $(src)/helpers.c FORCE
 quiet_cmd_exports = EXPORTS $@
       cmd_exports = \
 	$(NM) -p --defined-only $< \
-		| awk '/ (T|R|D) / {printf "EXPORT_SYMBOL_RUST_GPL(%s);\n",$$3}' > $@
+		| awk '/ (T|R|D|B) / {printf "EXPORT_SYMBOL_RUST_GPL(%s);\n",$$3}' > $@
 
 $(obj)/exports_core_generated.h: $(obj)/core.o FORCE
 	$(call if_changed,exports)

rust/kernel/alloc/box_ext.rs

@@ -21,8 +21,10 @@ pub trait BoxExt<T>: Sized {
 
 impl<T> BoxExt<T> for Box<T> {
     fn new(x: T, flags: Flags) -> Result<Self, AllocError> {
-        let b = <Self as BoxExt<_>>::new_uninit(flags)?;
+        let mut b = <Self as BoxExt<_>>::new_uninit(flags)?;
-        Ok(Box::write(b, x))
+        b.write(x);
+        // SAFETY: We just wrote to it.
+        Ok(unsafe { b.assume_init() })
     }
 
     #[cfg(any(test, testlib))]

rust/kernel/block/mq/gen_disk.rs

@@ -6,8 +6,8 @@
 //! C header: [`include/linux/blk_mq.h`](srctree/include/linux/blk_mq.h)
 
 use crate::block::mq::{raw_writer::RawWriter, Operations, TagSet};
-use crate::error;
 use crate::{bindings, error::from_err_ptr, error::Result, sync::Arc};
+use crate::{error, static_lock_class};
 use core::fmt::{self, Write};
 
 /// A builder for [`GenDisk`].
@@ -93,8 +93,6 @@ impl GenDiskBuilder {
         name: fmt::Arguments<'_>,
         tagset: Arc<TagSet<T>>,
     ) -> Result<GenDisk<T>> {
-        let lock_class_key = crate::sync::LockClassKey::new();
-
         // SAFETY: `bindings::queue_limits` contain only fields that are valid when zeroed.
         let mut lim: bindings::queue_limits = unsafe { core::mem::zeroed() };
 
@@ -110,7 +108,7 @@ impl GenDiskBuilder {
                 tagset.raw_tag_set(),
                 &mut lim,
                 core::ptr::null_mut(),
-                lock_class_key.as_ptr(),
+                static_lock_class!().as_ptr(),
             )
         })?;
 

rust/kernel/init/macros.rs

@@ -145,7 +145,7 @@
 //!         }
 //!     }
 //!     // Implement the internal `PinData` trait that marks the pin-data struct as a pin-data
-//!     // struct. This is important to ensure that no user can implement a rouge `__pin_data`
+//!     // struct. This is important to ensure that no user can implement a rogue `__pin_data`
 //!     // function without using `unsafe`.
 //!     unsafe impl<T> ::kernel::init::__internal::PinData for __ThePinData<T> {
 //!         type Datee = Bar<T>;
@@ -156,7 +156,7 @@
 //!     // case no such fields exist, hence this is almost empty. The two phantomdata fields exist
 //!     // for two reasons:
 //!     // - `__phantom`: every generic must be used, since we cannot really know which generics
-//!     //   are used, we declere all and then use everything here once.
+//!     //   are used, we declare all and then use everything here once.
 //!     // - `__phantom_pin`: uses the `'__pin` lifetime and ensures that this struct is invariant
 //!     //   over it. The lifetime is needed to work around the limitation that trait bounds must
 //!     //   not be trivial, e.g. the user has a `#[pin] PhantomPinned` field -- this is

rust/kernel/net/phy.rs

@@ -491,7 +491,7 @@ impl<T: Driver> Adapter<T> {
 pub struct DriverVTable(Opaque<bindings::phy_driver>);
 
 // SAFETY: `DriverVTable` doesn't expose any &self method to access internal data, so it's safe to
-// share `&DriverVTable` across execution context boundries.
+// share `&DriverVTable` across execution context boundaries.
 unsafe impl Sync for DriverVTable {}
 
 /// Creates a [`DriverVTable`] instance from [`Driver`].

rust/macros/module.rs

@@ -217,7 +217,11 @@ pub(crate) fn module(ts: TokenStream) -> TokenStream {
             // freed until the module is unloaded.
             #[cfg(MODULE)]
             static THIS_MODULE: kernel::ThisModule = unsafe {{
-                kernel::ThisModule::from_ptr(&kernel::bindings::__this_module as *const _ as *mut _)
+                extern \"C\" {{
+                    static __this_module: kernel::types::Opaque<kernel::bindings::module>;
+                }}
+
+                kernel::ThisModule::from_ptr(__this_module.get())
             }};
             #[cfg(not(MODULE))]
             static THIS_MODULE: kernel::ThisModule = unsafe {{