kernel/linux.git/samples/rust/rust_misc_device.rs, branch v7.0-rc7

Merge tag 'char-misc-7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

2026-02-17T17:11:04+00:00

Pull char/misc/IIO driver updates from Greg KH: "Here is the big set of char/misc/iio and other smaller driver subsystem changes for 7.0-rc1. Lots of little things in here, including: - Loads of iio driver changes and updates and additions - gpib driver updates - interconnect driver updates - i3c driver updates - hwtracing (coresight and intel) driver updates - deletion of the obsolete mwave driver - binder driver updates (rust and c versions) - mhi driver updates (causing a merge conflict, see below) - mei driver updates - fsi driver updates - eeprom driver updates - lots of other small char and misc driver updates and cleanups All of these have been in linux-next for a while, with no reported issues" * tag 'char-misc-7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (297 commits) mux: mmio: fix regmap leak on probe failure rust_binder: return p from rust_binder_transaction_target_node() drivers: android: binder: Update ARef imports from sync::aref rust_binder: fix needless borrow in context.rs iio: magn: mmc5633: Fix Kconfig for combination of I3C as module and driver builtin iio: sca3000: Fix a resource leak in sca3000_probe() iio: proximity: rfd77402: Add interrupt handling support iio: proximity: rfd77402: Document device private data structure iio: proximity: rfd77402: Use devm-managed mutex initialization iio: proximity: rfd77402: Use kernel helper for result polling iio: proximity: rfd77402: Align polling timeout with datasheet iio: cros_ec: Allow enabling/disabling calibration mode iio: frequency: ad9523: correct kernel-doc bad line warning iio: buffer: buffer_impl.h: fix kernel-doc warnings iio: gyro: itg3200: Fix unchecked return value in read_raw MAINTAINERS: add entry for ADE9000 driver iio: accel: sca3000: remove unused last_timestamp field iio: accel: adxl372: remove unused int2_bitmask field iio: adc: ad7766: Use iio_trigger_generic_data_rdy_poll() iio: magnetometer: Remove IRQF_ONESHOT ...

samples: rust: remove imports available via prelude

2026-01-26T17:15:20+00:00

These imports are already in scope by importing `kernel::prelude::*` and does not need to be imported separately. Signed-off-by: Gary Guo Reviewed-by: Alice Ryhl Acked-by: Danilo Krummrich Acked-by: Greg Kroah-Hartman Link: https://patch.msgid.link/20260123172007.136873-4-gary@garyguo.net Signed-off-by: Miguel Ojeda

rust: miscdevice: replace `kernel::c_str!` with C-Strings

2025-12-29T11:16:01+00:00

C-String literals were added in Rust 1.77. Replace instances of `kernel::c_str!` with C-String literals where possible. Acked-by: Greg Kroah-Hartman Reviewed-by: Alice Ryhl Reviewed-by: Benno Lossin Signed-off-by: Tamir Duberstein Reviewed-by: Daniel Almeida Link: https://patch.msgid.link/20251222-cstr-char-misc-v1-1-d218537d28ab@gmail.com Signed-off-by: Greg Kroah-Hartman

Merge patch series "Rust support for `struct iov_iter`"

2025-09-06T11:27:23+00:00

Alice Ryhl says: This series adds support for the `struct iov_iter` type. This type represents an IO buffer for reading or writing, and can be configured for either direction of communication. In Rust, we define separate types for reading and writing. This will ensure that you cannot mix them up and e.g. call copy_from_iter in a read_iter syscall. To use the new abstractions, miscdevices are given new methods read_iter and write_iter that can be used to implement the read/write syscalls on a miscdevice. The miscdevice sample is updated to provide read/write operations. Intended for Greg's miscdevice tree. Link: https://lore.kernel.org/r/20250822-iov-iter-v5-0-6ce4819c2977@google.com Signed-off-by: Greg Kroah-Hartman

samples: rust_misc_device: Expand the sample to support read()ing from userspace

2025-09-06T11:27:20+00:00

A userland application can now operate on the char device with read() in order to consume a locally held buffer. Memory for the buffer is to be provisioned and the buffer populated in its subsequently provided write() counterpart. Signed-off-by: Lee Jones Reviewed-by: Andreas Hindborg Co-developed-by: Alice Ryhl Signed-off-by: Alice Ryhl Signed-off-by: Greg Kroah-Hartman Link: https://lore.kernel.org/r/20250822-iov-iter-v5-5-6ce4819c2977@google.com

rust: miscdevice: update ARef import to sync::aref

2025-08-19T10:37:21+00:00

Update the import of `ARef` in misc_device sample to use `sync::aref` instead of `types`. This is part of the ongoing effort to move `ARef` and `AlwaysRefCounted` to the `sync` module for better modularity and type organization. Suggested-by: Benno Lossin Link: https://github.com/Rust-for-Linux/linux/issues/1173 Signed-off-by: Shankari Anand Reviewed-by: Benno Lossin Link: https://lore.kernel.org/r/20250818132806.134248-1-shankari.ak0208@gmail.com Signed-off-by: Greg Kroah-Hartman

rust: uaccess: use newtype for user pointers

2025-07-14T21:52:45+00:00

Currently, Rust code uses a typedef for unsigned long to represent userspace addresses. This is unfortunate because it means that userspace addresses could accidentally be mixed up with other integers. To alleviate that, we introduce a new UserPtr struct that wraps a raw pointer to represent a userspace address. By using a struct, type checking enforces that userspace addresses cannot be mixed up with anything else. This is similar to the __user annotation in C that detects cases where user pointers are mixed with non-user pointers. Note that unlike __user pointers in C, this type is just a pointer without a target type. This means that it can't detect cases such as mixing up which struct this user pointer references. However, that is okay due to the way this is intended to be used - generally, you create a UserPtr in your ioctl callback from the provided usize *before* dispatching on which ioctl is in use, and then after dispatching on the ioctl you pass the UserPtr into a UserSliceReader or UserSliceWriter; selecting the target type does not happen until you have obtained the UserSliceReader/Writer. The UserPtr type is not marked with #[derive(Debug)], which means that it's not possible to print values of this type. This avoids ASLR leakage. The type is added to the prelude as it is a fairly fundamental type similar to c_int. The wrapping_add() method is renamed to wrapping_byte_add() for consistency with the method name found on raw pointers. Reviewed-by: Benno Lossin Reviewed-by: Danilo Krummrich Reviewed-by: Christian Schrefl Reviewed-by: Boqun Feng Reviewed-by: Greg Kroah-Hartman Signed-off-by: Alice Ryhl Link: https://lore.kernel.org/r/20250616-userptr-newtype-v3-1-5ff7b2d18d9e@google.com [ Reworded title. - Miguel ] Signed-off-by: Miguel Ojeda

Merge tag 'char-misc-6.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

2025-04-01T18:26:08+00:00

Pull char / misc / IIO driver updates from Greg KH: "Here is the big set of char, misc, iio, and other smaller driver subsystems for 6.15-rc1. Lots of stuff in here, including: - loads of IIO changes and driver updates - counter driver updates - w1 driver updates - faux conversions for some drivers that were abusing the platform bus interface - coresight driver updates - rust miscdevice binding updates based on real-world-use - other minor driver updates All of these have been in linux-next with no reported issues for quite a while" * tag 'char-misc-6.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (292 commits) samples: rust_misc_device: fix markup in top-level docs Coresight: Fix a NULL vs IS_ERR() bug in probe misc: lis3lv02d: convert to use faux_device tlclk: convert to use faux_device regulator: dummy: convert to use the faux device interface bus: mhi: host: Fix race between unprepare and queue_buf coresight: configfs: Constify struct config_item_type doc: iio: ad7380: describe offload support iio: ad7380: add support for SPI offload iio: light: Add check for array bounds in veml6075_read_int_time_ms iio: adc: ti-ads7924 Drop unnecessary function parameters staging: iio: ad9834: Use devm_regulator_get_enable() staging: iio: ad9832: Use devm_regulator_get_enable() iio: gyro: bmg160_spi: add of_match_table dt-bindings: iio: adc: Add i.MX94 and i.MX95 support iio: adc: ad7768-1: remove unnecessary locking Documentation: ABI: add wideband filter type to sysfs-bus-iio iio: adc: ad7768-1: set MOSI idle state to prevent accidental reset iio: adc: ad7768-1: Fix conversion result sign iio: adc: ad7124: Benefit of dev = indio_dev->dev.parent in ad7124_parse_channel_config() ...

samples: rust_misc_device: fix markup in top-level docs

2025-03-17T07:06:07+00:00

The meaning of /// is to document the thing that comes after it, so currently the example is documentation for the `use core::pin::Pin;` statement. To write top-level docs (and have them rendered as such in the html by rustdoc), use //! instead. This does not change the contents of the docs at all. The only change is changing /// to //!. Signed-off-by: Alice Ryhl Fixes: 8d9b095b8f89 ("samples: rust_misc_device: Provide an example C program to exercise functionality") Reviewed-by: Benno Lossin Reviewed-by: Christian Schrefl Link: https://lore.kernel.org/r/20250313-rust_misc_device_tld-v1-1-a519bced9a6d@google.com Signed-off-by: Greg Kroah-Hartman

rust: module: introduce `authors` key

2025-03-10T14:12:17+00:00

In the `module!` macro, the `author` field is currently of type `String`. Since modules can have multiple authors, this limitation prevents specifying more than one. Add an `authors` field as `Option>` to allow creating modules with multiple authors, and change the documentation and all current users to use it. Eventually, the single `author` field may be removed. [ The `modinfo` key needs to still be `author`; otherwise, tooling may not work properly, e.g.: $ modinfo --author samples/rust/rust_print.ko Rust for Linux Contributors I have also kept the original `author` field (undocumented), so that we can drop it more easily in a kernel cycle or two. - Miguel ] Suggested-by: Miguel Ojeda Link: https://github.com/Rust-for-Linux/linux/issues/244 Reviewed-by: Charalampos Mitrodimas Reviewed-by: Alice Ryhl Reviewed-by: Andreas Hindborg Signed-off-by: Guilherme Giacomo Simoes Link: https://lore.kernel.org/r/20250309175712.845622-2-trintaeoitogc@gmail.com [ Fixed `modinfo` key. Kept `author` field. Reworded message accordingly. Updated my email. - Miguel ] Signed-off-by: Miguel Ojeda