Merge tag 'v6.6.78' into for/openbmc/dev-6.6

This is the 6.6.78 stable release

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Merge tag 'v6.6.78' into for/openbmc/dev-6.6

This is the 6.6.78 stable release

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# gpg: Signature made Mon 17 Feb 2025 19:10:53 ACDT
# gpg: using RSA key 647F28654894E3BD457199BE38DBBDC86092693E
# gpg: Good signature from "Greg Kroah-Hartman <gregkh@kernel.org>" [marginal]
# gpg: gregkh@kernel.org: Verified 7 signatures in the past 3 weeks. Encrypted
# 0 messages.
# gpg: Warning: you have yet to encrypt a message to this key!
# gpg: Warning: if you think you've seen more signatures by this key and user
# id, then this key might be a forgery! Carefully examine the email address
# for small variations. If the key is suspect, then use
# gpg --tofu-policy bad 647F28654894E3BD457199BE38DBBDC86092693E
# to mark it as being bad.
# gpg: WARNING: This key is not certified with sufficiently trusted signatures!
# gpg: It is not certain that the signature belongs to the owner.
# Primary key fingerprint: 647F 2865 4894 E3BD 4571 99BE 38DB BDC8 6092 693E

show more ...

rust: init: use explicit ABI to clean warning in future compilers

commit c21bdb3d8a850afdfa4afe77eea39ae9533629b0 upstream.

Starting with Rust 1.86.0 (currently in nightly, to be released on
2025-0

rust: init: use explicit ABI to clean warning in future compilers

commit c21bdb3d8a850afdfa4afe77eea39ae9533629b0 upstream.

Starting with Rust 1.86.0 (currently in nightly, to be released on
2025-04-03), the `missing_abi` lint is warn-by-default [1]:

error: extern declarations without an explicit ABI are deprecated
--> rust/doctests_kernel_generated.rs:3158:1
|
3158 | extern {
| ^^^^^^ help: explicitly specify the C ABI: `extern "C"`
|
= note: `-D missing-abi` implied by `-D warnings`
= help: to override `-D warnings` add `#[allow(missing_abi)]`

Thus clean it up.

Cc: <stable@vger.kernel.org> # Needed in 6.12.y and 6.13.y only (Rust is pinned in older LTSs).
Fixes: 7f8977a7fe6d ("rust: init: add `{pin_}chain` functions to `{Pin}Init<T, E>`")
Link: https://github.com/rust-lang/rust/pull/132397 [1]
Reviewed-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Fiona Behrens <me@kloenk.dev>
Link: https://lore.kernel.org/r/20250121200934.222075-1-ojeda@kernel.org
[ Added 6.13.y to Cc: stable tag. - Miguel ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

show more ...

Merge tag 'v6.6.30' into dev-6.6

This is the 6.6.30 stable release

rust: init: remove impl Zeroable for Infallible

commit 49ceae68a0df9a92617a61e9ce8a0efcf6419585 upstream.

In Rust, producing an invalid value of any type is immediate undefined
behavior (UB); this

rust: init: remove impl Zeroable for Infallible

commit 49ceae68a0df9a92617a61e9ce8a0efcf6419585 upstream.

In Rust, producing an invalid value of any type is immediate undefined
behavior (UB); this includes via zeroing memory. Therefore, since an
uninhabited type has no valid values, producing any values at all for it is
UB.

The Rust standard library type `core::convert::Infallible` is uninhabited,
by virtue of having been declared as an enum with no cases, which always
produces uninhabited types in Rust.

The current kernel code allows this UB to be triggered, for example by code
like `Box::<core::convert::Infallible>::init(kernel::init::zeroed())`.

Thus, remove the implementation of `Zeroable` for `Infallible`, thereby
avoiding the unsoundness (potential for future UB).

Cc: stable@vger.kernel.org
Fixes: 38cde0bd7b67 ("rust: init: add `Zeroable` trait and `init::zeroed` function")
Closes: https://github.com/Rust-for-Linux/pinned-init/pull/13
Signed-off-by: Laine Taffin Altman <alexanderaltman@me.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Boqun Feng <boqun.feng@gmail.com>
Reviewed-by: Benno Lossin <benno.lossin@proton.me>
Link: https://lore.kernel.org/r/CA160A4E-561E-4918-837E-3DCEBA74F808@me.com
[ Reformatted the comment slightly. ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Merge drm/drm-fixes into drm-misc-fixes

Forwarding to v6.6-rc1.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>

Merge branch 'next' into for-linus

Prepare input updates for 6.6 merge window.

Merge tag 'rust-6.6' of https://github.com/Rust-for-Linux/linux

Pull rust updates from Miguel Ojeda:
"In terms of lines, most changes this time are on the pinned-init API
and infrastructure. Whil

Merge tag 'rust-6.6' of https://github.com/Rust-for-Linux/linux

Pull rust updates from Miguel Ojeda:
"In terms of lines, most changes this time are on the pinned-init API
and infrastructure. While we have a Rust version upgrade, and thus a
bunch of changes from the vendored 'alloc' crate as usual, this time
those do not account for many lines.

Toolchain and infrastructure:

- Upgrade to Rust 1.71.1. This is the second such upgrade, which is a
smaller jump compared to the last time.

This version allows us to remove the '__rust_*' allocator functions
-- the compiler now generates them as expected, thus now our
'KernelAllocator' is used.

It also introduces the 'offset_of!' macro in the standard library
(as an unstable feature) which we will need soon. So far, we were
using a declarative macro as a prerequisite in some not-yet-landed
patch series, which did not support sub-fields (i.e. nested
structs):

#[repr(C)]
struct S {
a: u16,
b: (u8, u8),
}

assert_eq!(offset_of!(S, b.1), 3);

- Upgrade to bindgen 0.65.1. This is the first time we upgrade its
version.

Given it is a fairly big jump, it comes with a fair number of
improvements/changes that affect us, such as a fix needed to
support LLVM 16 as well as proper support for '__noreturn' C
functions, which are now mapped to return the '!' type in Rust:

void __noreturn f(void); // C
pub fn f() -> !; // Rust

- 'scripts/rust_is_available.sh' improvements and fixes.

This series takes care of all the issues known so far and adds a
few new checks to cover for even more cases, plus adds some more
help texts. All this together will hopefully make problematic
setups easier to identify and to be solved by users building the
kernel.

In addition, it adds a test suite which covers all branches of the
shell script, as well as tests for the issues found so far.

- Support rust-analyzer for out-of-tree modules too.

- Give 'cfg's to rust-analyzer for the 'core' and 'alloc' crates.

- Drop 'scripts/is_rust_module.sh' since it is not needed anymore.

Macros crate:

- New 'paste!' proc macro.

This macro is a more flexible version of 'concat_idents!': it
allows the resulting identifier to be used to declare new items and
it allows to transform the identifiers before concatenating them,
e.g.

let x_1 = 42;
paste!(let [<x _2>] = [<x _1>];);
assert!(x_1 == x_2);

The macro is then used for several of the pinned-init API changes
in this pull.

Pinned-init API:

- Make '#[pin_data]' compatible with conditional compilation of
fields, allowing to write code like:

#[pin_data]
pub struct Foo {
#[cfg(CONFIG_BAR)]
a: Bar,
#[cfg(not(CONFIG_BAR))]
a: Baz,
}

- New '#[derive(Zeroable)]' proc macro for the 'Zeroable' trait,
which allows 'unsafe' implementations for structs where every field
implements the 'Zeroable' trait, e.g.:

#[derive(Zeroable)]
pub struct DriverData {
id: i64,
buf_ptr: *mut u8,
len: usize,
}

- Add '..Zeroable::zeroed()' syntax to the 'pin_init!' macro for
zeroing all other fields, e.g.:

pin_init!(Buf {
buf: [1; 64],
..Zeroable::zeroed()
});

- New '{,pin_}init_array_from_fn()' functions to create array
initializers given a generator function, e.g.:

let b: Box<[usize; 1_000]> = Box::init::<Error>(
init_array_from_fn(|i| i)
).unwrap();

assert_eq!(b.len(), 1_000);
assert_eq!(b[123], 123);

- New '{,pin_}chain' methods for '{,Pin}Init<T, E>' that allow to
execute a closure on the value directly after initialization, e.g.:

let foo = init!(Foo {
buf <- init::zeroed()
}).chain(|foo| {
foo.setup();
Ok(())
});

- Support arbitrary paths in init macros, instead of just identifiers
and generic types.

- Implement the 'Zeroable' trait for the 'UnsafeCell<T>' and
'Opaque<T>' types.

- Make initializer values inaccessible after initialization.

- Make guards in the init macros hygienic.

'allocator' module:

- Use 'krealloc_aligned()' in 'KernelAllocator::alloc' preventing
misaligned allocations when the Rust 1.71.1 upgrade is applied
later in this pull.

The equivalent fix for the previous compiler version (where
'KernelAllocator' is not yet used) was merged into 6.5 already,
which added the 'krealloc_aligned()' function used here.

- Implement 'KernelAllocator::{realloc, alloc_zeroed}' for
performance, using 'krealloc_aligned()' too, which forwards the
call to the C API.

'types' module:

- Make 'Opaque' be '!Unpin', removing the need to add a
'PhantomPinned' field to Rust structs that contain C structs which
must not be moved.

- Make 'Opaque' use 'UnsafeCell' as the outer type, rather than
inner.

Documentation:

- Suggest obtaining the source code of the Rust's 'core' library
using the tarball instead of the repository.

MAINTAINERS:

- Andreas and Alice, from Samsung and Google respectively, are
joining as reviewers of the "RUST" entry.

As well as a few other minor changes and cleanups"

* tag 'rust-6.6' of https://github.com/Rust-for-Linux/linux: (42 commits)
rust: init: update expanded macro explanation
rust: init: add `{pin_}chain` functions to `{Pin}Init<T, E>`
rust: init: make `PinInit<T, E>` a supertrait of `Init<T, E>`
rust: init: implement `Zeroable` for `UnsafeCell<T>` and `Opaque<T>`
rust: init: add support for arbitrary paths in init macros
rust: init: add functions to create array initializers
rust: init: add `..Zeroable::zeroed()` syntax for zeroing all missing fields
rust: init: make initializer values inaccessible after initializing
rust: init: wrap type checking struct initializers in a closure
rust: init: make guards in the init macros hygienic
rust: add derive macro for `Zeroable`
rust: init: make `#[pin_data]` compatible with conditional compilation of fields
rust: init: consolidate init macros
docs: rust: clarify what 'rustup override' does
docs: rust: update instructions for obtaining 'core' source
docs: rust: add command line to rust-analyzer section
scripts: generate_rust_analyzer: provide `cfg`s for `core` and `alloc`
rust: bindgen: upgrade to 0.65.1
rust: enable `no_mangle_with_rust_abi` Clippy lint
rust: upgrade to Rust 1.71.1
...

show more ...

Merge tag 'linux-kselftest-kunit-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

Pull kunit updates from Shuah Khan:

- add support for running Rust documentation te

Merge tag 'linux-kselftest-kunit-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

Pull kunit updates from Shuah Khan:

- add support for running Rust documentation tests as KUnit tests

- make init, str, sync, types doctests compilable/testable

- add support for attributes API which include speed, modules
attributes, ability to filter and report attributes

- add support for marking tests slow using attributes API

- add attributes API documentation

- fix a wild-memory-access bug in kunit_filter_suites() and a possible
memory leak in kunit_filter_suites()

- add support for counting number of test suites in a module, list
action to kunit test modules, and test filtering on module tests

* tag 'linux-kselftest-kunit-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest: (25 commits)
kunit: fix struct kunit_attr header
kunit: replace KUNIT_TRIGGER_STATIC_STUB maro with KUNIT_STATIC_STUB_REDIRECT
kunit: Allow kunit test modules to use test filtering
kunit: Make 'list' action available to kunit test modules
kunit: Report the count of test suites in a module
kunit: fix uninitialized variables bug in attributes filtering
kunit: fix possible memory leak in kunit_filter_suites()
kunit: fix wild-memory-access bug in kunit_filter_suites()
kunit: Add documentation of KUnit test attributes
kunit: add tests for filtering attributes
kunit: time: Mark test as slow using test attributes
kunit: memcpy: Mark tests as slow using test attributes
kunit: tool: Add command line interface to filter and report attributes
kunit: Add ability to filter attributes
kunit: Add module attribute
kunit: Add speed attribute
kunit: Add test attributes API structure
MAINTAINERS: add Rust KUnit files to the KUnit entry
rust: support running Rust documentation tests as KUnit ones
rust: types: make doctests compilable/testable
...

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rust: init: add `{pin_}chain` functions to `{Pin}Init<T, E>`

The `{pin_}chain` functions extend an initializer: it not only
initializes the value, but also executes a closure taking a reference to
t

rust: init: add `{pin_}chain` functions to `{Pin}Init<T, E>`

The `{pin_}chain` functions extend an initializer: it not only
initializes the value, but also executes a closure taking a reference to
the initialized value. This allows to do something with a value directly
after initialization.

Suggested-by: Asahi Lina <lina@asahilina.net>
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Signed-off-by: Benno Lossin <benno.lossin@proton.me>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://lore.kernel.org/r/20230814084602.25699-13-benno.lossin@proton.me
[ Cleaned a few trivial nits. ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

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rust: init: make `PinInit<T, E>` a supertrait of `Init<T, E>`

Remove the blanket implementation of `PinInit<T, E> for I where I:
Init<T, E>`. This blanket implementation prevented custom types that

rust: init: make `PinInit<T, E>` a supertrait of `Init<T, E>`

Remove the blanket implementation of `PinInit<T, E> for I where I:
Init<T, E>`. This blanket implementation prevented custom types that
implement `PinInit`.

Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Benno Lossin <benno.lossin@proton.me>
Link: https://lore.kernel.org/r/20230814084602.25699-12-benno.lossin@proton.me
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

show more ...

rust: init: implement `Zeroable` for `UnsafeCell<T>` and `Opaque<T>`

`UnsafeCell<T>` and `T` have the same layout so if `T` is `Zeroable`
then so should `UnsafeCell<T>` be. This allows using the der

rust: init: implement `Zeroable` for `UnsafeCell<T>` and `Opaque<T>`

`UnsafeCell<T>` and `T` have the same layout so if `T` is `Zeroable`
then so should `UnsafeCell<T>` be. This allows using the derive macro
for `Zeroable` on types that contain an `UnsafeCell<T>`.
Since `Opaque<T>` contains a `MaybeUninit<T>`, all bytes zero is a valid
bit pattern for that type.

Reviewed-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Signed-off-by: Benno Lossin <benno.lossin@proton.me>
Link: https://lore.kernel.org/r/20230814084602.25699-11-benno.lossin@proton.me
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

show more ...

rust: init: add functions to create array initializers

Add two functions `pin_init_array_from_fn` and `init_array_from_fn` that
take a function that generates initializers for `T` from `usize`, the

rust: init: add functions to create array initializers

Add two functions `pin_init_array_from_fn` and `init_array_from_fn` that
take a function that generates initializers for `T` from `usize`, the added
functions then return an initializer for `[T; N]` where every element is
initialized by an element returned from the generator function.

Suggested-by: Asahi Lina <lina@asahilina.net>
Reviewed-by: Björn Roy Baron <bjorn3_gh@protonmail.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Signed-off-by: Benno Lossin <benno.lossin@proton.me>
Link: https://lore.kernel.org/r/20230814084602.25699-9-benno.lossin@proton.me
[ Cleaned a couple trivial nits. ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

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rust: init: add `..Zeroable::zeroed()` syntax for zeroing all missing fields

Add the struct update syntax to the init macros, but only for
`..Zeroable::zeroed()`. Adding this at the end of the struc

rust: init: add `..Zeroable::zeroed()` syntax for zeroing all missing fields

Add the struct update syntax to the init macros, but only for
`..Zeroable::zeroed()`. Adding this at the end of the struct initializer
allows one to omit fields from the initializer, these fields will be
initialized with 0x00 set to every byte. Only types that implement the
`Zeroable` trait can utilize this.

Suggested-by: Asahi Lina <lina@asahilina.net>
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Benno Lossin <benno.lossin@proton.me>
Link: https://lore.kernel.org/r/20230814084602.25699-8-benno.lossin@proton.me
[ Rebased on `rust-next` and cleaned a few trivial nits. ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

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rust: init: make guards in the init macros hygienic

Use hygienic identifiers for the guards instead of the field names. This
makes the init macros feel more like normal struct initializers, since
as

rust: init: make guards in the init macros hygienic

Use hygienic identifiers for the guards instead of the field names. This
makes the init macros feel more like normal struct initializers, since
assigning identifiers with the name of a field does not create
conflicts.

Also change the internals of the guards, no need to make the `forget`
function `unsafe`, since users cannot access the guards anyways. Now the
guards are carried directly on the stack and have no extra `Cell<bool>`
field that marks if they have been forgotten or not, instead they are
just forgotten via `mem::forget`.

Suggested-by: Asahi Lina <lina@asahilina.net>
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Benno Lossin <benno.lossin@proton.me>
Link: https://lore.kernel.org/r/20230814084602.25699-5-benno.lossin@proton.me
[ Cleaned a few trivial nits. ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

show more ...

rust: init: consolidate init macros

Merges the implementations of `try_init!` and `try_pin_init!`. These two
macros are very similar, but use different traits. The new macro
`__init_internal!` that

rust: init: consolidate init macros

Merges the implementations of `try_init!` and `try_pin_init!`. These two
macros are very similar, but use different traits. The new macro
`__init_internal!` that is now the implementation for both takes these
traits as parameters.

This change does not affect any users, as no public API has been
changed, but it should simplify maintaining the init macros.

Reviewed-by: Björn Roy Baron <bjorn3_gh@protonmail.com>
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: Benno Lossin <benno.lossin@proton.me>
Link: https://lore.kernel.org/r/20230814084602.25699-2-benno.lossin@proton.me
[ Cleaned a couple trivial nits. ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

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Merge drm/drm-next into drm-intel-next

Catching-up with drm-next and drm-intel-gt-next.
It will unblock a code refactor around the platform
definitions (names vs acronyms).

Signed-off-by: Rodrigo V

Merge drm/drm-next into drm-intel-next

Catching-up with drm-next and drm-intel-gt-next.
It will unblock a code refactor around the platform
definitions (names vs acronyms).

Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

show more ...

Merge drm/drm-next into drm-intel-gt-next

Need to pull in b3e4aae612ec ("drm/i915/hdcp: Modify hdcp_gsc_message msg sending mechanism") as
a dependency for https://patchwork.freedesktop.org/series/1

Merge drm/drm-next into drm-intel-gt-next

Need to pull in b3e4aae612ec ("drm/i915/hdcp: Modify hdcp_gsc_message msg sending mechanism") as
a dependency for https://patchwork.freedesktop.org/series/121735/

Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

show more ...

Merge drm/drm-next into drm-misc-next

Backmerging to get v6.5-rc2.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>

rust: init: make doctests compilable/testable

Rust documentation tests are going to be build/run-tested
with the KUnit integration added in a future patch, thus
update them to make them compilable/t

rust: init: make doctests compilable/testable

Rust documentation tests are going to be build/run-tested
with the KUnit integration added in a future patch, thus
update them to make them compilable/testable so that we
may start enforcing it.

Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Reviewed-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>
Reviewed-by: David Gow <davidgow@google.com>
Reviewed-by: Benno Lossin <benno.lossin@proton.me>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Björn Roy Baron <bjorn3_gh@protonmail.com>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

show more ...

Merge tag 'v6.4' into next

Sync up with mainline to bring in updates to shared infrastructure.

ASoC: Merge v6.5-rc2

Get a similar baseline to my other branches, and fixes for people using
the branch.

Merge v6.5-rc1 into drm-misc-fixes

Boris needs 6.5-rc1 in drm-misc-fixes to prevent a conflict.

Signed-off-by: Maxime Ripard <mripard@kernel.org>

Merge branch 'master' into mm-hotfixes-stable

Merge branch 'for-6.5/apple' into for-linus

- improved support for Keychron K8 keyboard (Lasse Brun)

Merge tag 'rust-6.5' of https://github.com/Rust-for-Linux/linux

Pull rust updates from Miguel Ojeda:
"A fairly small one in terms of feature additions. Most of the changes
in terms of lines come

Merge tag 'rust-6.5' of https://github.com/Rust-for-Linux/linux

Pull rust updates from Miguel Ojeda:
"A fairly small one in terms of feature additions. Most of the changes
in terms of lines come from the upgrade to the new version of the
toolchain (which in turn is big due to the vendored 'alloc' crate).

Upgrade to Rust 1.68.2:

- This is the first such upgrade, and we will try to update it often
from now on, in order to remain close to the latest release, until
a minimum version (which is "in the future") can be established.

The upgrade brings the stabilization of 4 features we used (and 2
more that we used in our old 'rust' branch).

Commit 3ed03f4da06e ("rust: upgrade to Rust 1.68.2") contains the
details and rationale.

pin-init API:

- Several internal improvements and fixes to the pin-init API, e.g.
allowing to use 'Self' in a struct definition with '#[pin_data]'.

'error' module:

- New 'name()' method for the 'Error' type (with 'errname()'
integration), used to implement the 'Debug' trait for 'Error'.

- Add error codes from 'include/linux/errno.h' to the list of Rust
'Error' constants.

- Allow specifying error type on the 'Result' type (with the default
still being our usual 'Error' type).

'str' module:

- 'TryFrom' implementation for 'CStr', and new 'to_cstring()' method
based on it.

'sync' module:

- Implement 'AsRef' trait for 'Arc', allowing to use 'Arc' in code
that is generic over smart pointer types.

- Add 'ptr_eq' method to 'Arc' for easier, less error prone
comparison between two 'Arc' pointers.

- Reword the 'Send' safety comment for 'Arc', and avoid referencing
it from the 'Sync' one.

'task' module:

- Implement 'Send' marker for 'Task'.

'types' module:

- Implement 'Send' and 'Sync' markers for 'ARef<T>' when 'T' is
'AlwaysRefCounted', 'Send' and 'Sync'.

Other changes:

- Documentation improvements and '.gitattributes' change to start
using the Rust diff driver"

* tag 'rust-6.5' of https://github.com/Rust-for-Linux/linux:
rust: error: `impl Debug` for `Error` with `errname()` integration
rust: task: add `Send` marker to `Task`
rust: specify when `ARef` is thread safe
rust: sync: reword the `Arc` safety comment for `Sync`
rust: sync: reword the `Arc` safety comment for `Send`
rust: sync: implement `AsRef<T>` for `Arc<T>`
rust: sync: add `Arc::ptr_eq`
rust: error: add missing error codes
rust: str: add conversion from `CStr` to `CString`
rust: error: allow specifying error type on `Result`
rust: init: update macro expansion example in docs
rust: macros: replace Self with the concrete type in #[pin_data]
rust: macros: refactor generics parsing of `#[pin_data]` into its own function
rust: macros: fix usage of `#[allow]` in `quote!`
docs: rust: point directly to the standalone installers
.gitattributes: set diff driver for Rust source code files
rust: upgrade to Rust 1.68.2
rust: arc: fix intra-doc link in `Arc<T>::init`
rust: alloc: clarify what is the upstream version

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