add rustfmt.toml

Signed-off-by: Finn Behrens <me@kloenk.de>

6 files changed, 63 insertions, 29 deletions

diff --git a/drivers/char/rust_example/src/lib.rs b/drivers/char/rust_example/src/lib.rs
index e8405f12ce44..fe74656d977d 100644
--- a/drivers/char/rust_example/src/lib.rs
+++ b/drivers/char/rust_example/src/lib.rs
@@ -5,7 +5,7 @@
 
 use kernel::prelude::*;
 
-module!{
+module! {
     type: RustExample,
     name: b"rust_example",
     author: b"Rust for Linux Contributors",
@@ -48,4 +48,3 @@ impl Drop for RustExample {
         println!("Rust Example (exit)");
     }
 }
-
diff --git a/rust/kernel/build.rs b/rust/kernel/build.rs
index 5a3794fdc995..0897186b3f92 100644
--- a/rust/kernel/build.rs
+++ b/rust/kernel/build.rs
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 
-use std::path::PathBuf;
 use std::env;
+use std::path::PathBuf;
 
 const INCLUDED_TYPES: &[&str] = &["file_system_type", "mode_t", "umode_t", "ctl_table"];
 const INCLUDED_FUNCTIONS: &[&str] = &[
@@ -92,8 +92,7 @@ fn main() {
     println!("cargo:rerun-if-env-changed=RUST_BINDGEN_CFLAGS");
 
     let kernel_dir = "../../";
-    let cflags = env::var("RUST_BINDGEN_CFLAGS")
-        .expect("Must be invoked from kernel makefile");
+    let cflags = env::var("RUST_BINDGEN_CFLAGS").expect("Must be invoked from kernel makefile");
 
     let kernel_args = prepare_cflags(&cflags, &kernel_dir);
 
diff --git a/rust/kernel/src/prelude.rs b/rust/kernel/src/prelude.rs
index 75a5017488a4..36d9e2104f68 100644
--- a/rust/kernel/src/prelude.rs
+++ b/rust/kernel/src/prelude.rs
@@ -2,16 +2,8 @@
 
 //! The `kernel` prelude
 
-pub use alloc::{
-    string::String,
-    borrow::ToOwned,
-};
+pub use alloc::{borrow::ToOwned, string::String};
 
 pub use module::module;
 
-pub use super::{
-    println,
-    KernelResult,
-    KernelModule,
-};
-
+pub use super::{println, KernelModule, KernelResult};
diff --git a/rust/kernel/src/user_ptr.rs b/rust/kernel/src/user_ptr.rs
index 19ecb711e24a..986043c4596f 100644
--- a/rust/kernel/src/user_ptr.rs
+++ b/rust/kernel/src/user_ptr.rs
@@ -9,7 +9,8 @@ use crate::c_types;
 use crate::error;
 
 extern "C" {
-    fn rust_helper_access_ok(addr: *const c_types::c_void, len: c_types::c_ulong) -> c_types::c_int;
+    fn rust_helper_access_ok(addr: *const c_types::c_void, len: c_types::c_ulong)
+        -> c_types::c_int;
 }
 
 /// A reference to an area in userspace memory, which can be either
diff --git a/rust/module/src/lib.rs b/rust/module/src/lib.rs
index 82dac6780b9c..b8bdbc9eb847 100644
--- a/rust/module/src/lib.rs
+++ b/rust/module/src/lib.rs
@@ -4,7 +4,7 @@
 
 extern crate proc_macro;
 
-use proc_macro::{TokenStream, TokenTree, Group, Delimiter, token_stream};
+use proc_macro::{token_stream, Delimiter, Group, TokenStream, TokenTree};
 
 fn expect_ident(it: &mut token_stream::IntoIter) -> String {
     if let TokenTree::Ident(ident) = it.next().unwrap() {
@@ -78,13 +78,24 @@ fn get_byte_string(it: &mut token_stream::IntoIter, expected_name: &str) -> Stri
     byte_string[2..byte_string.len() - 1].to_string()
 }
 
-fn __build_modinfo_string_base(module: &str, field: &str, content: &str, variable: &str, builtin: bool) -> String {
+fn __build_modinfo_string_base(
+    module: &str,
+    field: &str,
+    content: &str,
+    variable: &str,
+    builtin: bool,
+) -> String {
     let string = if builtin {
         // Built-in modules prefix their modinfo strings by `module.`
-        format!("{module}.{field}={content}", module=module, field=field, content=content)
+        format!(
+            "{module}.{field}={content}",
+            module = module,
+            field = field,
+            content = content
+        )
     } else {
         // Loadable modules' modinfo strings go as-is
-        format!("{field}={content}", field=field, content=content)
+        format!("{field}={content}", field = field, content = content)
     };
 
     format!(
@@ -94,7 +105,11 @@ fn __build_modinfo_string_base(module: &str, field: &str, content: &str, variabl
             #[used]
             pub static {variable}: [u8; {length}] = *b\"{string}\\0\";
         ",
-        cfg = if builtin { "#[cfg(not(MODULE))]" } else { "#[cfg(MODULE)]" },
+        cfg = if builtin {
+            "#[cfg(not(MODULE))]"
+        } else {
+            "#[cfg(MODULE)]"
+        },
         variable = variable,
         length = string.len() + 1,
         string = string,
@@ -102,15 +117,27 @@ fn __build_modinfo_string_base(module: &str, field: &str, content: &str, variabl
 }
 
 fn __build_modinfo_string_variable(module: &str, field: &str) -> String {
-    format!("__{module}_{field}", module=module, field=field)
+    format!("__{module}_{field}", module = module, field = field)
 }
 
 fn build_modinfo_string_only_builtin(module: &str, field: &str, content: &str) -> String {
-    __build_modinfo_string_base(module, field, content, &__build_modinfo_string_variable(module, field), true)
+    __build_modinfo_string_base(
+        module,
+        field,
+        content,
+        &__build_modinfo_string_variable(module, field),
+        true,
+    )
 }
 
 fn build_modinfo_string_only_loadable(module: &str, field: &str, content: &str) -> String {
-    __build_modinfo_string_base(module, field, content, &__build_modinfo_string_variable(module, field), false)
+    __build_modinfo_string_base(
+        module,
+        field,
+        content,
+        &__build_modinfo_string_variable(module, field),
+        false,
+    )
 }
 
 fn build_modinfo_string(module: &str, field: &str, content: &str) -> String {
@@ -119,8 +146,13 @@ fn build_modinfo_string(module: &str, field: &str, content: &str) -> String {
 }
 
 fn build_modinfo_string_param(module: &str, field: &str, param: &str, content: &str) -> String {
-    let variable = format!("__{module}_{field}_{param}", module=module, field=field, param=param);
-    let content = format!("{param}:{content}", param=param, content=content);
+    let variable = format!(
+        "__{module}_{field}_{param}",
+        module = module,
+        field = field,
+        param = param
+    );
+    let content = format!("{param}:{content}", param = param, content = content);
     __build_modinfo_string_base(module, field, &content, &variable, true)
         + &__build_modinfo_string_base(module, field, &content, &variable, false)
 }
@@ -202,8 +234,18 @@ pub fn module(ts: TokenStream) -> TokenStream {
             t => panic!("Unrecognized type {}", t),
         };
 
-        params_modinfo.push_str(&build_modinfo_string_param(&name, "parmtype", &param_name, &param_kernel_type));
-        params_modinfo.push_str(&build_modinfo_string_param(&name, "parm", &param_name, &param_description));
+        params_modinfo.push_str(&build_modinfo_string_param(
+            &name,
+            "parmtype",
+            &param_name,
+            &param_kernel_type,
+        ));
+        params_modinfo.push_str(&build_modinfo_string_param(
+            &name,
+            "parm",
+            &param_name,
+            &param_description,
+        ));
         params_modinfo.push_str(
             &format!(
                 "
@@ -352,4 +394,3 @@ pub fn module(ts: TokenStream) -> TokenStream {
         initcall_section = ".initcall6.init"
     ).parse().unwrap()
 }
-
diff --git a/rustfmt.toml b/rustfmt.toml
new file mode 100644
index 000000000000..25cc4a14bf20
--- /dev/null
+++ b/rustfmt.toml
@@ -0,0 +1,2 @@
+ignore = [ "rust/shlex" ]
+