Merge tag 'rust-6.2' of https://github.com/Rust-for-Linux/linux

Pull rust updates from Miguel Ojeda:
 "The first set of changes after the merge, the major ones being:

   - String and formatting: new types 'CString', 'CStr', 'BStr' and
     'Formatter'; new macros 'c_str!', 'b_str!' and 'fmt!'.

   - Errors: the rest of the error codes from 'errno-base.h', as well as
     some 'From' trait implementations for the 'Error' type.

   - Printing: the rest of the 'pr_*!' levels and the continuation one
     'pr_cont!', as well as a new sample.

   - 'alloc' crate: new constructors 'try_with_capacity()' and
     'try_with_capacity_in()' for 'RawVec' and 'Vec'.

   - Procedural macros: new macros '#[vtable]' and 'concat_idents!', as
     well as better ergonomics for 'module!' users.

   - Asserting: new macros 'static_assert!', 'build_error!' and
     'build_assert!', as well as a new crate 'build_error' to support
     them.

   - Vocabulary types: new types 'Opaque' and 'Either'.

   - Debugging: new macro 'dbg!'"

* tag 'rust-6.2' of https://github.com/Rust-for-Linux/linux: (28 commits)
  rust: types: add `Opaque` type
  rust: types: add `Either` type
  rust: build_assert: add `build_{error,assert}!` macros
  rust: add `build_error` crate
  rust: static_assert: add `static_assert!` macro
  rust: std_vendor: add `dbg!` macro based on `std`'s one
  rust: str: add `fmt!` macro
  rust: str: add `CString` type
  rust: str: add `Formatter` type
  rust: str: add `c_str!` macro
  rust: str: add `CStr` unit tests
  rust: str: implement several traits for `CStr`
  rust: str: add `CStr` type
  rust: str: add `b_str!` macro
  rust: str: add `BStr` type
  rust: alloc: add `Vec::try_with_capacity{,_in}()` constructors
  rust: alloc: add `RawVec::try_with_capacity_in()` constructor
  rust: prelude: add `error::code::*` constant items
  rust: error: add `From` implementations for `Error`
  rust: error: add codes from `errno-base.h`
  ...

1 files changed, 87 insertions, 3 deletions

diff --git a/rust/kernel/error.rs b/rust/kernel/error.rs
index 466b2a8fe569..5b9751d7ff1d 100644
--- a/rust/kernel/error.rs
+++ b/rust/kernel/error.rs
@@ -4,12 +4,60 @@
 //!
 //! C header: [`include/uapi/asm-generic/errno-base.h`](../../../include/uapi/asm-generic/errno-base.h)
 
-use alloc::collections::TryReserveError;
+use alloc::{
+    alloc::{AllocError, LayoutError},
+    collections::TryReserveError,
+};
+
+use core::convert::From;
+use core::num::TryFromIntError;
+use core::str::Utf8Error;
 
 /// Contains the C-compatible error codes.
 pub mod code {
-    /// Out of memory.
-    pub const ENOMEM: super::Error = super::Error(-(crate::bindings::ENOMEM as i32));
+    macro_rules! declare_err {
+        ($err:tt $(,)? $($doc:expr),+) => {
+            $(
+            #[doc = $doc]
+            )*
+            pub const $err: super::Error = super::Error(-(crate::bindings::$err as i32));
+        };
+    }
+
+    declare_err!(EPERM, "Operation not permitted.");
+    declare_err!(ENOENT, "No such file or directory.");
+    declare_err!(ESRCH, "No such process.");
+    declare_err!(EINTR, "Interrupted system call.");
+    declare_err!(EIO, "I/O error.");
+    declare_err!(ENXIO, "No such device or address.");
+    declare_err!(E2BIG, "Argument list too long.");
+    declare_err!(ENOEXEC, "Exec format error.");
+    declare_err!(EBADF, "Bad file number.");
+    declare_err!(ECHILD, "Exec format error.");
+    declare_err!(EAGAIN, "Try again.");
+    declare_err!(ENOMEM, "Out of memory.");
+    declare_err!(EACCES, "Permission denied.");
+    declare_err!(EFAULT, "Bad address.");
+    declare_err!(ENOTBLK, "Block device required.");
+    declare_err!(EBUSY, "Device or resource busy.");
+    declare_err!(EEXIST, "File exists.");
+    declare_err!(EXDEV, "Cross-device link.");
+    declare_err!(ENODEV, "No such device.");
+    declare_err!(ENOTDIR, "Not a directory.");
+    declare_err!(EISDIR, "Is a directory.");
+    declare_err!(EINVAL, "Invalid argument.");
+    declare_err!(ENFILE, "File table overflow.");
+    declare_err!(EMFILE, "Too many open files.");
+    declare_err!(ENOTTY, "Not a typewriter.");
+    declare_err!(ETXTBSY, "Text file busy.");
+    declare_err!(EFBIG, "File too large.");
+    declare_err!(ENOSPC, "No space left on device.");
+    declare_err!(ESPIPE, "Illegal seek.");
+    declare_err!(EROFS, "Read-only file system.");
+    declare_err!(EMLINK, "Too many links.");
+    declare_err!(EPIPE, "Broken pipe.");
+    declare_err!(EDOM, "Math argument out of domain of func.");
+    declare_err!(ERANGE, "Math result not representable.");
 }
 
 /// Generic integer kernel error.
@@ -30,12 +78,48 @@ impl Error {
     }
 }
 
+impl From<AllocError> for Error {
+    fn from(_: AllocError) -> Error {
+        code::ENOMEM
+    }
+}
+
+impl From<TryFromIntError> for Error {
+    fn from(_: TryFromIntError) -> Error {
+        code::EINVAL
+    }
+}
+
+impl From<Utf8Error> for Error {
+    fn from(_: Utf8Error) -> Error {
+        code::EINVAL
+    }
+}
+
 impl From<TryReserveError> for Error {
     fn from(_: TryReserveError) -> Error {
         code::ENOMEM
     }
 }
 
+impl From<LayoutError> for Error {
+    fn from(_: LayoutError) -> Error {
+        code::ENOMEM
+    }
+}
+
+impl From<core::fmt::Error> for Error {
+    fn from(_: core::fmt::Error) -> Error {
+        code::EINVAL
+    }
+}
+
+impl From<core::convert::Infallible> for Error {
+    fn from(e: core::convert::Infallible) -> Error {
+        match e {}
+    }
+}
+
 /// A [`Result`] with an [`Error`] error type.
 ///
 /// To be used as the return type for functions that may fail.