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| author | Danilo Krummrich <dakr@kernel.org> | 2026-01-07 11:35:03 +0100 |
|---|---|---|
| committer | Danilo Krummrich <dakr@kernel.org> | 2026-01-16 01:17:29 +0100 |
| commit | c1d4519e1c36ffa01973e23af4502e69dcd84f39 (patch) | |
| tree | 26e7f83683b1feefa4a9606cdde88143bffc770f /rust/kernel/driver.rs | |
| parent | 0af1a9e4629a85964a7eebe58ebd2ca37c8c21fc (diff) | |
| download | lwn-c1d4519e1c36ffa01973e23af4502e69dcd84f39.tar.gz lwn-c1d4519e1c36ffa01973e23af4502e69dcd84f39.zip | |
rust: driver: add DEVICE_DRIVER_OFFSET to the DriverLayout trait
Add an associated const DEVICE_DRIVER_OFFSET to the DriverLayout trait
indicating the offset of the embedded struct device_driver within
Self::DriverType, i.e. the specific driver structs, such as struct
pci_driver or struct platform_driver.
Acked-by: Alice Ryhl <aliceryhl@google.com>
Acked-by: Igor Korotin <igor.korotin.linux@gmail.com>
Link: https://patch.msgid.link/20260107103511.570525-5-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Diffstat (limited to 'rust/kernel/driver.rs')
| -rw-r--r-- | rust/kernel/driver.rs | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/rust/kernel/driver.rs b/rust/kernel/driver.rs index 73968b13d7dc..4a96a07905d1 100644 --- a/rust/kernel/driver.rs +++ b/rust/kernel/driver.rs @@ -107,10 +107,16 @@ use pin_init::{pin_data, pinned_drop, PinInit}; /// # Safety /// /// Implementors must guarantee that: -/// - `DriverType` is `repr(C)`. +/// - `DriverType` is `repr(C)`, +/// - `DriverType` embeds a valid `struct device_driver` at byte offset `DEVICE_DRIVER_OFFSET`. pub unsafe trait DriverLayout { /// The specific driver type embedding a `struct device_driver`. type DriverType: Default; + + /// Byte offset of the embedded `struct device_driver` within `DriverType`. + /// + /// This must correspond exactly to the location of the embedded `struct device_driver` field. + const DEVICE_DRIVER_OFFSET: usize; } /// The [`RegistrationOps`] trait serves as generic interface for subsystems (e.g., PCI, Platform, |