[PATCH v2 00/19] rust: replace `kernel::c_str!` with C-Strings

[PATCH v2 00/19] rust: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

This series depends on step 3[0].

Subsystem maintainers: I would appreciate your `Acked-by`s so that this
can be taken through Miguel's tree (where the previous series must go).

Link: https://lore.kernel.org/all/20250925-cstr-core-v16-0-5cdcb3470ec2@gmail.com/ [0]

Signed-off-by: Tamir Duberstein <tamird@gmail.com>
---
Changes in v2:
- Rebase.
- Add two patches to address new code.
- Drop incorrectly applied Acked-by tags from Danilo.
- Link to v1: https://lore.kernel.org/r/20250710-core-cstr-cstrings-v1-0-027420ea799e@gmail.com

---
Tamir Duberstein (19):
      drivers: net: replace `kernel::c_str!` with C-Strings
      gpu: nova-core: replace `kernel::c_str!` with C-Strings
      rust: auxiliary: replace `kernel::c_str!` with C-Strings
      rust: clk: replace `kernel::c_str!` with C-Strings
      rust: configfs: replace `kernel::c_str!` with C-Strings
      rust: cpufreq: replace `kernel::c_str!` with C-Strings
      rust: device: replace `kernel::c_str!` with C-Strings
      rust: firmware: replace `kernel::c_str!` with C-Strings
      rust: kunit: replace `kernel::c_str!` with C-Strings
      rust: macros: replace `kernel::c_str!` with C-Strings
      rust: miscdevice: replace `kernel::c_str!` with C-Strings
      rust: net: replace `kernel::c_str!` with C-Strings
      rust: pci: replace `kernel::c_str!` with C-Strings
      rust: platform: replace `kernel::c_str!` with C-Strings
      rust: seq_file: replace `kernel::c_str!` with C-Strings
      rust: str: replace `kernel::c_str!` with C-Strings
      rust: sync: replace `kernel::c_str!` with C-Strings
      rust: io: replace `kernel::c_str!` with C-Strings
      rust: regulator: replace `kernel::c_str!` with C-Strings

 drivers/block/rnull.rs                |  2 +-
 drivers/cpufreq/rcpufreq_dt.rs        |  5 ++---
 drivers/gpu/drm/nova/driver.rs        | 10 +++++-----
 drivers/gpu/nova-core/driver.rs       |  6 +++---
 drivers/net/phy/ax88796b_rust.rs      |  7 +++----
 drivers/net/phy/qt2025.rs             |  5 ++---
 rust/kernel/clk.rs                    |  6 ++----
 rust/kernel/configfs.rs               |  9 +++++----
 rust/kernel/cpufreq.rs                |  3 +--
 rust/kernel/device.rs                 |  4 +---
 rust/kernel/device/property.rs        |  6 +++---
 rust/kernel/firmware.rs               |  6 +++---
 rust/kernel/io/mem.rs                 |  7 +++----
 rust/kernel/kunit.rs                  | 11 ++++-------
 rust/kernel/net/phy.rs                |  6 ++----
 rust/kernel/platform.rs               |  6 +++---
 rust/kernel/regulator.rs              |  9 +++------
 rust/kernel/seq_file.rs               |  4 ++--
 rust/kernel/str.rs                    |  5 ++---
 rust/kernel/sync.rs                   |  5 ++---
 rust/kernel/sync/completion.rs        |  2 +-
 rust/kernel/workqueue.rs              |  8 ++++----
 rust/macros/kunit.rs                  | 10 +++++-----
 rust/macros/module.rs                 |  2 +-
 samples/rust/rust_configfs.rs         |  5 ++---
 samples/rust/rust_driver_auxiliary.rs |  4 ++--
 samples/rust/rust_driver_faux.rs      |  4 ++--
 samples/rust/rust_driver_pci.rs       |  4 ++--
 samples/rust/rust_driver_platform.rs  | 30 ++++++++++++++----------------
 samples/rust/rust_misc_device.rs      |  3 +--
 scripts/rustdoc_test_gen.rs           |  4 ++--
 31 files changed, 88 insertions(+), 110 deletions(-)
---
base-commit: f3f6b3664302e16ef1c6b91034a72df5564d6b8a
change-id: 20250710-core-cstr-cstrings-1faaa632f0fd
prerequisite-change-id: 20250201-cstr-core-d4b9b69120cf:v16
prerequisite-patch-id: e0ca756f740ab0ce7478bbf6510948ba89529a2f
prerequisite-patch-id: 6d8dbdf864f79fc0c2820e702a7cb87753649ca0
prerequisite-patch-id: 7d4d1d036043a85dcbaf0d09ea85768120efe094

Best regards,
--  
Tamir Duberstein <tamird@gmail.com>

[PATCH v2 01/19] drivers: net: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

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 <gregkh@linuxfoundation.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
---
 drivers/net/phy/ax88796b_rust.rs | 7 +++----
 drivers/net/phy/qt2025.rs        | 5 ++---
 2 files changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/net/phy/ax88796b_rust.rs b/drivers/net/phy/ax88796b_rust.rs
index bc73ebccc2aa..2d24628a4e58 100644
--- a/drivers/net/phy/ax88796b_rust.rs
+++ b/drivers/net/phy/ax88796b_rust.rs
@@ -5,7 +5,6 @@
 //!
 //! C version of this driver: [`drivers/net/phy/ax88796b.c`](./ax88796b.c)
 use kernel::{
-    c_str,
     net::phy::{self, reg::C22, DeviceId, Driver},
     prelude::*,
     uapi,
@@ -41,7 +40,7 @@ fn asix_soft_reset(dev: &mut phy::Device) -> Result {
 #[vtable]
 impl Driver for PhyAX88772A {
     const FLAGS: u32 = phy::flags::IS_INTERNAL;
-    const NAME: &'static CStr = c_str!("Asix Electronics AX88772A");
+    const NAME: &'static CStr = c"Asix Electronics AX88772A";
     const PHY_DEVICE_ID: DeviceId = DeviceId::new_with_exact_mask(0x003b1861);
 
     // AX88772A is not working properly with some old switches (NETGEAR EN 108TP):
@@ -105,7 +104,7 @@ fn link_change_notify(dev: &mut phy::Device) {
 #[vtable]
 impl Driver for PhyAX88772C {
     const FLAGS: u32 = phy::flags::IS_INTERNAL;
-    const NAME: &'static CStr = c_str!("Asix Electronics AX88772C");
+    const NAME: &'static CStr = c"Asix Electronics AX88772C";
     const PHY_DEVICE_ID: DeviceId = DeviceId::new_with_exact_mask(0x003b1881);
 
     fn suspend(dev: &mut phy::Device) -> Result {
@@ -125,7 +124,7 @@ fn soft_reset(dev: &mut phy::Device) -> Result {
 
 #[vtable]
 impl Driver for PhyAX88796B {
-    const NAME: &'static CStr = c_str!("Asix Electronics AX88796B");
+    const NAME: &'static CStr = c"Asix Electronics AX88796B";
     const PHY_DEVICE_ID: DeviceId = DeviceId::new_with_model_mask(0x003b1841);
 
     fn soft_reset(dev: &mut phy::Device) -> Result {
diff --git a/drivers/net/phy/qt2025.rs b/drivers/net/phy/qt2025.rs
index 0b9400dcb4c1..9ccc75f70219 100644
--- a/drivers/net/phy/qt2025.rs
+++ b/drivers/net/phy/qt2025.rs
@@ -9,7 +9,6 @@
 //!
 //! The QT2025 PHY integrates an Intel 8051 micro-controller.
 
-use kernel::c_str;
 use kernel::error::code;
 use kernel::firmware::Firmware;
 use kernel::net::phy::{
@@ -36,7 +35,7 @@
 
 #[vtable]
 impl Driver for PhyQT2025 {
-    const NAME: &'static CStr = c_str!("QT2025 10Gpbs SFP+");
+    const NAME: &'static CStr = c"QT2025 10Gpbs SFP+";
     const PHY_DEVICE_ID: phy::DeviceId = phy::DeviceId::new_with_exact_mask(0x0043a400);
 
     fn probe(dev: &mut phy::Device) -> Result<()> {
@@ -69,7 +68,7 @@ fn probe(dev: &mut phy::Device) -> Result<()> {
         // The micro-controller will start running from the boot ROM.
         dev.write(C45::new(Mmd::PCS, 0xe854), 0x00c0)?;
 
-        let fw = Firmware::request(c_str!("qt2025-2.0.3.3.fw"), dev.as_ref())?;
+        let fw = Firmware::request(c"qt2025-2.0.3.3.fw", dev.as_ref())?;
         if fw.data().len() > SZ_16K + SZ_8K {
             return Err(code::EFBIG);
         }

-- 
2.51.0

[PATCH v2 02/19] gpu: nova-core: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

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 <gregkh@linuxfoundation.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Acked-by: Danilo Krummrich <dakr@kernel.org>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
---
 drivers/gpu/drm/nova/driver.rs  | 10 +++++-----
 drivers/gpu/nova-core/driver.rs |  6 +++---
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/nova/driver.rs b/drivers/gpu/drm/nova/driver.rs
index b28b2e05cc15..87480ee8dbae 100644
--- a/drivers/gpu/drm/nova/driver.rs
+++ b/drivers/gpu/drm/nova/driver.rs
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 
-use kernel::{auxiliary, c_str, device::Core, drm, drm::gem, drm::ioctl, prelude::*, types::ARef};
+use kernel::{auxiliary, device::Core, drm, drm::gem, drm::ioctl, prelude::*, types::ARef};
 
 use crate::file::File;
 use crate::gem::NovaObject;
@@ -22,12 +22,12 @@ pub(crate) struct NovaData {
     major: 0,
     minor: 0,
     patchlevel: 0,
-    name: c_str!("nova"),
-    desc: c_str!("Nvidia Graphics"),
+    name: c"nova",
+    desc: c"Nvidia Graphics",
 };
 
-const NOVA_CORE_MODULE_NAME: &CStr = c_str!("NovaCore");
-const AUXILIARY_NAME: &CStr = c_str!("nova-drm");
+const NOVA_CORE_MODULE_NAME: &CStr = c"NovaCore";
+const AUXILIARY_NAME: &CStr = c"nova-drm";
 
 kernel::auxiliary_device_table!(
     AUX_TABLE,
diff --git a/drivers/gpu/nova-core/driver.rs b/drivers/gpu/nova-core/driver.rs
index 274989ea1fb4..2f1a37be3107 100644
--- a/drivers/gpu/nova-core/driver.rs
+++ b/drivers/gpu/nova-core/driver.rs
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 
-use kernel::{auxiliary, bindings, c_str, device::Core, pci, prelude::*, sizes::SZ_16M, sync::Arc};
+use kernel::{auxiliary, bindings, device::Core, pci, prelude::*, sizes::SZ_16M, sync::Arc};
 
 use crate::gpu::Gpu;
 
@@ -35,7 +35,7 @@ fn probe(pdev: &pci::Device<Core>, _info: &Self::IdInfo) -> Result<Pin<KBox<Self
         pdev.set_master();
 
         let bar = Arc::pin_init(
-            pdev.iomap_region_sized::<BAR0_SIZE>(0, c_str!("nova-core/bar0")),
+            pdev.iomap_region_sized::<BAR0_SIZE>(0, c"nova-core/bar0"),
             GFP_KERNEL,
         )?;
 
@@ -44,7 +44,7 @@ fn probe(pdev: &pci::Device<Core>, _info: &Self::IdInfo) -> Result<Pin<KBox<Self
                 gpu <- Gpu::new(pdev, bar)?,
                 _reg: auxiliary::Registration::new(
                     pdev.as_ref(),
-                    c_str!("nova-drm"),
+                    c"nova-drm",
                     0, // TODO[XARR]: Once it lands, use XArray; for now we don't use the ID.
                     crate::MODULE_NAME
                 )?,

-- 
2.51.0

[PATCH v2 03/19] rust: auxiliary: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

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 <gregkh@linuxfoundation.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Acked-by: Danilo Krummrich <dakr@kernel.org>
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
---
 samples/rust/rust_driver_auxiliary.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/samples/rust/rust_driver_auxiliary.rs b/samples/rust/rust_driver_auxiliary.rs
index f2a820683fc3..7c916eb11b64 100644
--- a/samples/rust/rust_driver_auxiliary.rs
+++ b/samples/rust/rust_driver_auxiliary.rs
@@ -5,13 +5,13 @@
 //! To make this driver probe, QEMU must be run with `-device pci-testdev`.
 
 use kernel::{
-    auxiliary, bindings, c_str, device::Core, driver, error::Error, pci, prelude::*, InPlaceModule,
+    auxiliary, bindings, device::Core, driver, error::Error, pci, prelude::*, InPlaceModule,
 };
 
 use pin_init::PinInit;
 
 const MODULE_NAME: &CStr = <LocalModule as kernel::ModuleMetadata>::NAME;
-const AUXILIARY_NAME: &CStr = c_str!("auxiliary");
+const AUXILIARY_NAME: &CStr = c"auxiliary";
 
 struct AuxiliaryDriver;
 

-- 
2.51.0

[PATCH v2 04/19] rust: clk: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

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 <gregkh@linuxfoundation.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
---
 rust/kernel/clk.rs | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/rust/kernel/clk.rs b/rust/kernel/clk.rs
index 1e6c8c42fb3a..09469277e95b 100644
--- a/rust/kernel/clk.rs
+++ b/rust/kernel/clk.rs
@@ -104,13 +104,12 @@ mod common_clk {
     /// The following example demonstrates how to obtain and configure a clock for a device.
     ///
     /// ```
-    /// use kernel::c_str;
     /// use kernel::clk::{Clk, Hertz};
     /// use kernel::device::Device;
     /// use kernel::error::Result;
     ///
     /// fn configure_clk(dev: &Device) -> Result {
-    ///     let clk = Clk::get(dev, Some(c_str!("apb_clk")))?;
+    ///     let clk = Clk::get(dev, Some(c"apb_clk"))?;
     ///
     ///     clk.prepare_enable()?;
     ///
@@ -272,13 +271,12 @@ fn drop(&mut self) {
     /// device. The code functions correctly whether or not the clock is available.
     ///
     /// ```
-    /// use kernel::c_str;
     /// use kernel::clk::{OptionalClk, Hertz};
     /// use kernel::device::Device;
     /// use kernel::error::Result;
     ///
     /// fn configure_clk(dev: &Device) -> Result {
-    ///     let clk = OptionalClk::get(dev, Some(c_str!("apb_clk")))?;
+    ///     let clk = OptionalClk::get(dev, Some(c"apb_clk"))?;
     ///
     ///     clk.prepare_enable()?;
     ///

-- 
2.51.0

[PATCH v2 05/19] rust: configfs: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

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 <gregkh@linuxfoundation.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
Acked-by: Andreas Hindborg <a.hindborg@kernel.org>
---
 rust/kernel/configfs.rs       | 9 +++++----
 samples/rust/rust_configfs.rs | 5 ++---
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/rust/kernel/configfs.rs b/rust/kernel/configfs.rs
index 9fb5ef825e41..69bb1fb53543 100644
--- a/rust/kernel/configfs.rs
+++ b/rust/kernel/configfs.rs
@@ -21,7 +21,6 @@
 //!
 //! ```ignore
 //! use kernel::alloc::flags;
-//! use kernel::c_str;
 //! use kernel::configfs_attrs;
 //! use kernel::configfs;
 //! use kernel::new_mutex;
@@ -50,7 +49,7 @@
 //!
 //!         try_pin_init!(Self {
 //!             config <- configfs::Subsystem::new(
-//!                 c_str!("rust_configfs"), item_type, Configuration::new()
+//!                 c"rust_configfs", item_type, Configuration::new()
 //!             ),
 //!         })
 //!     }
@@ -66,7 +65,7 @@
 //! impl Configuration {
 //!     fn new() -> impl PinInit<Self, Error> {
 //!         try_pin_init!(Self {
-//!             message: c_str!("Hello World\n"),
+//!             message: c"Hello World\n",
 //!             bar <- new_mutex!((KBox::new([0; PAGE_SIZE], flags::GFP_KERNEL)?, 0)),
 //!         })
 //!     }
@@ -1000,7 +999,9 @@ macro_rules! configfs_attrs {
                     static [< $data:upper _ $name:upper _ATTR >]:
                         $crate::configfs::Attribute<$attr, $data, $data> =
                             unsafe {
-                                $crate::configfs::Attribute::new(c_str!(::core::stringify!($name)))
+                                $crate::configfs::Attribute::new(
+                                    $crate::c_str!(::core::stringify!($name)),
+                                )
                             };
                 )*
 
diff --git a/samples/rust/rust_configfs.rs b/samples/rust/rust_configfs.rs
index 5005453f874d..ea84c23b784b 100644
--- a/samples/rust/rust_configfs.rs
+++ b/samples/rust/rust_configfs.rs
@@ -3,7 +3,6 @@
 //! Rust configfs sample.
 
 use kernel::alloc::flags;
-use kernel::c_str;
 use kernel::configfs;
 use kernel::configfs_attrs;
 use kernel::new_mutex;
@@ -35,7 +34,7 @@ struct Configuration {
 impl Configuration {
     fn new() -> impl PinInit<Self, Error> {
         try_pin_init!(Self {
-            message: c_str!("Hello World\n"),
+            message: c"Hello World\n",
             bar <- new_mutex!((KBox::new([0; PAGE_SIZE], flags::GFP_KERNEL)?, 0)),
         })
     }
@@ -61,7 +60,7 @@ fn init(_module: &'static ThisModule) -> impl PinInit<Self, Error> {
 
         try_pin_init!(Self {
             config <- configfs::Subsystem::new(
-                c_str!("rust_configfs"), item_type, Configuration::new()
+                c"rust_configfs", item_type, Configuration::new()
             ),
         })
     }

-- 
2.51.0

[PATCH v2 06/19] rust: cpufreq: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

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 <gregkh@linuxfoundation.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
---
 drivers/cpufreq/rcpufreq_dt.rs | 5 ++---
 rust/kernel/cpufreq.rs         | 3 +--
 2 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/cpufreq/rcpufreq_dt.rs b/drivers/cpufreq/rcpufreq_dt.rs
index 7e1fbf9a091f..1120a8f5edd7 100644
--- a/drivers/cpufreq/rcpufreq_dt.rs
+++ b/drivers/cpufreq/rcpufreq_dt.rs
@@ -3,7 +3,6 @@
 //! Rust based implementation of the cpufreq-dt driver.
 
 use kernel::{
-    c_str,
     clk::Clk,
     cpu, cpufreq,
     cpumask::CpumaskVar,
@@ -56,7 +55,7 @@ impl opp::ConfigOps for CPUFreqDTDriver {}
 
 #[vtable]
 impl cpufreq::Driver for CPUFreqDTDriver {
-    const NAME: &'static CStr = c_str!("cpufreq-dt");
+    const NAME: &'static CStr = c"cpufreq-dt";
     const FLAGS: u16 = cpufreq::flags::NEED_INITIAL_FREQ_CHECK | cpufreq::flags::IS_COOLING_DEV;
     const BOOST_ENABLED: bool = true;
 
@@ -201,7 +200,7 @@ fn register_em(policy: &mut cpufreq::Policy) {
     OF_TABLE,
     MODULE_OF_TABLE,
     <CPUFreqDTDriver as platform::Driver>::IdInfo,
-    [(of::DeviceId::new(c_str!("operating-points-v2")), ())]
+    [(of::DeviceId::new(c"operating-points-v2"), ())]
 );
 
 impl platform::Driver for CPUFreqDTDriver {
diff --git a/rust/kernel/cpufreq.rs b/rust/kernel/cpufreq.rs
index 86c02e81729e..43ecdc56cb59 100644
--- a/rust/kernel/cpufreq.rs
+++ b/rust/kernel/cpufreq.rs
@@ -840,7 +840,6 @@ fn register_em(_policy: &mut Policy) {
 /// ```
 /// use kernel::{
 ///     cpufreq,
-///     c_str,
 ///     device::{Core, Device},
 ///     macros::vtable,
 ///     of, platform,
@@ -853,7 +852,7 @@ fn register_em(_policy: &mut Policy) {
 ///
 /// #[vtable]
 /// impl cpufreq::Driver for SampleDriver {
-///     const NAME: &'static CStr = c_str!("cpufreq-sample");
+///     const NAME: &'static CStr = c"cpufreq-sample";
 ///     const FLAGS: u16 = cpufreq::flags::NEED_INITIAL_FREQ_CHECK | cpufreq::flags::IS_COOLING_DEV;
 ///     const BOOST_ENABLED: bool = true;
 ///

-- 
2.51.0

[PATCH v2 07/19] rust: device: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

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 <gregkh@linuxfoundation.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Acked-by: Danilo Krummrich <dakr@kernel.org>
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
---
 rust/kernel/device.rs          | 4 +---
 rust/kernel/device/property.rs | 6 +++---
 2 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/rust/kernel/device.rs b/rust/kernel/device.rs
index f3718da11871..242286162c8b 100644
--- a/rust/kernel/device.rs
+++ b/rust/kernel/device.rs
@@ -10,8 +10,6 @@
 };
 use core::{marker::PhantomData, ptr};
 
-#[cfg(CONFIG_PRINTK)]
-use crate::c_str;
 use crate::str::CStrExt as _;
 
 pub mod property;
@@ -378,7 +376,7 @@ unsafe fn printk(&self, klevel: &[u8], msg: fmt::Arguments<'_>) {
             bindings::_dev_printk(
                 klevel.as_ptr().cast::<crate::ffi::c_char>(),
                 self.as_raw(),
-                c_str!("%pA").as_char_ptr(),
+                c"%pA".as_char_ptr(),
                 core::ptr::from_ref(&msg).cast::<crate::ffi::c_void>(),
             )
         };
diff --git a/rust/kernel/device/property.rs b/rust/kernel/device/property.rs
index 3a332a8c53a9..3eb3f36d66d0 100644
--- a/rust/kernel/device/property.rs
+++ b/rust/kernel/device/property.rs
@@ -178,11 +178,11 @@ pub fn property_count_elem<T: PropertyInt>(&self, name: &CStr) -> Result<usize>
     /// # Examples
     ///
     /// ```
-    /// # use kernel::{c_str, device::{Device, property::FwNode}, str::CString};
+    /// # use kernel::{device::{Device, property::FwNode}, str::CString};
     /// fn examples(dev: &Device) -> Result {
     ///     let fwnode = dev.fwnode().ok_or(ENOENT)?;
-    ///     let b: u32 = fwnode.property_read(c_str!("some-number")).required_by(dev)?;
-    ///     if let Some(s) = fwnode.property_read::<CString>(c_str!("some-str")).optional() {
+    ///     let b: u32 = fwnode.property_read(c"some-number").required_by(dev)?;
+    ///     if let Some(s) = fwnode.property_read::<CString>(c"some-str").optional() {
     ///         // ...
     ///     }
     ///     Ok(())

-- 
2.51.0

[PATCH v2 08/19] rust: firmware: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

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 <gregkh@linuxfoundation.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Acked-by: Danilo Krummrich <dakr@kernel.org>
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
---
 rust/kernel/firmware.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/rust/kernel/firmware.rs b/rust/kernel/firmware.rs
index 376e7e77453f..71168d8004e2 100644
--- a/rust/kernel/firmware.rs
+++ b/rust/kernel/firmware.rs
@@ -51,13 +51,13 @@ fn request_nowarn() -> Self {
 /// # Examples
 ///
 /// ```no_run
-/// # use kernel::{c_str, device::Device, firmware::Firmware};
+/// # use kernel::{device::Device, firmware::Firmware};
 ///
 /// # fn no_run() -> Result<(), Error> {
 /// # // SAFETY: *NOT* safe, just for the example to get an `ARef<Device>` instance
 /// # let dev = unsafe { Device::get_device(core::ptr::null_mut()) };
 ///
-/// let fw = Firmware::request(c_str!("path/to/firmware.bin"), &dev)?;
+/// let fw = Firmware::request(c"path/to/firmware.bin", &dev)?;
 /// let blob = fw.data();
 ///
 /// # Ok(())
@@ -204,7 +204,7 @@ macro_rules! module_firmware {
     ($($builder:tt)*) => {
         const _: () = {
             const __MODULE_FIRMWARE_PREFIX: &'static $crate::str::CStr = if cfg!(MODULE) {
-                $crate::c_str!("")
+                c""
             } else {
                 <LocalModule as $crate::ModuleMetadata>::NAME
             };

-- 
2.51.0

[PATCH v2 09/19] rust: kunit: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

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 <gregkh@linuxfoundation.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
---
 rust/kernel/kunit.rs        | 11 ++++-------
 rust/macros/kunit.rs        | 10 +++++-----
 scripts/rustdoc_test_gen.rs |  4 ++--
 3 files changed, 11 insertions(+), 14 deletions(-)

diff --git a/rust/kernel/kunit.rs b/rust/kernel/kunit.rs
index 3a43886cc14e..6223a5ac801c 100644
--- a/rust/kernel/kunit.rs
+++ b/rust/kernel/kunit.rs
@@ -9,9 +9,6 @@
 use crate::fmt;
 use crate::prelude::*;
 
-#[cfg(CONFIG_PRINTK)]
-use crate::c_str;
-
 /// Prints a KUnit error-level message.
 ///
 /// Public but hidden since it should only be used from KUnit generated code.
@@ -22,7 +19,7 @@ pub fn err(args: fmt::Arguments<'_>) {
     #[cfg(CONFIG_PRINTK)]
     unsafe {
         bindings::_printk(
-            c_str!("\x013%pA").as_char_ptr(),
+            c"\x013%pA".as_char_ptr(),
             core::ptr::from_ref(&args).cast::<c_void>(),
         );
     }
@@ -38,7 +35,7 @@ pub fn info(args: fmt::Arguments<'_>) {
     #[cfg(CONFIG_PRINTK)]
     unsafe {
         bindings::_printk(
-            c_str!("\x016%pA").as_char_ptr(),
+            c"\x016%pA".as_char_ptr(),
             core::ptr::from_ref(&args).cast::<c_void>(),
         );
     }
@@ -60,7 +57,7 @@ macro_rules! kunit_assert {
                 break 'out;
             }
 
-            static FILE: &'static $crate::str::CStr = $crate::c_str!($file);
+            static FILE: &'static $crate::str::CStr = $file;
             static LINE: i32 = ::core::line!() as i32 - $diff;
             static CONDITION: &'static $crate::str::CStr = $crate::c_str!(stringify!($condition));
 
@@ -249,7 +246,7 @@ pub const fn kunit_case_null() -> kernel::bindings::kunit_case {
 /// }
 ///
 /// static mut KUNIT_TEST_CASES: [kernel::bindings::kunit_case; 2] = [
-///     kernel::kunit::kunit_case(kernel::c_str!("name"), test_fn),
+///     kernel::kunit::kunit_case(c"name", test_fn),
 ///     kernel::kunit::kunit_case_null(),
 /// ];
 /// kernel::kunit_unsafe_test_suite!(suite_name, KUNIT_TEST_CASES);
diff --git a/rust/macros/kunit.rs b/rust/macros/kunit.rs
index 81d18149a0cc..c64df1a01b9d 100644
--- a/rust/macros/kunit.rs
+++ b/rust/macros/kunit.rs
@@ -89,8 +89,8 @@ pub(crate) fn kunit_tests(attr: TokenStream, ts: TokenStream) -> TokenStream {
     // unsafe extern "C" fn kunit_rust_wrapper_bar(_test: *mut ::kernel::bindings::kunit) { bar(); }
     //
     // static mut TEST_CASES: [::kernel::bindings::kunit_case; 3] = [
-    //     ::kernel::kunit::kunit_case(::kernel::c_str!("foo"), kunit_rust_wrapper_foo),
-    //     ::kernel::kunit::kunit_case(::kernel::c_str!("bar"), kunit_rust_wrapper_bar),
+    //     ::kernel::kunit::kunit_case(c"foo", kunit_rust_wrapper_foo),
+    //     ::kernel::kunit::kunit_case(c"bar", kunit_rust_wrapper_bar),
     //     ::kernel::kunit::kunit_case_null(),
     // ];
     //
@@ -109,7 +109,7 @@ pub(crate) fn kunit_tests(attr: TokenStream, ts: TokenStream) -> TokenStream {
         writeln!(kunit_macros, "{kunit_wrapper}").unwrap();
         writeln!(
             test_cases,
-            "    ::kernel::kunit::kunit_case(::kernel::c_str!(\"{test}\"), {kunit_wrapper_fn_name}),"
+            "    ::kernel::kunit::kunit_case(c\"{test}\", {kunit_wrapper_fn_name}),"
         )
         .unwrap();
         writeln!(
@@ -119,7 +119,7 @@ pub(crate) fn kunit_tests(attr: TokenStream, ts: TokenStream) -> TokenStream {
 #[allow(unused)]
 macro_rules! assert {{
     ($cond:expr $(,)?) => {{{{
-        kernel::kunit_assert!("{test}", "{path}", 0, $cond);
+        kernel::kunit_assert!("{test}", c"{path}", 0, $cond);
     }}}}
 }}
 
@@ -127,7 +127,7 @@ macro_rules! assert {{
 #[allow(unused)]
 macro_rules! assert_eq {{
     ($left:expr, $right:expr $(,)?) => {{{{
-        kernel::kunit_assert_eq!("{test}", "{path}", 0, $left, $right);
+        kernel::kunit_assert_eq!("{test}", c"{path}", 0, $left, $right);
     }}}}
 }}
         "#
diff --git a/scripts/rustdoc_test_gen.rs b/scripts/rustdoc_test_gen.rs
index c8f9dc2ab976..b0b70a3d0f54 100644
--- a/scripts/rustdoc_test_gen.rs
+++ b/scripts/rustdoc_test_gen.rs
@@ -174,7 +174,7 @@ pub extern "C" fn {kunit_name}(__kunit_test: *mut ::kernel::bindings::kunit) {{
     macro_rules! assert {{
         ($cond:expr $(,)?) => {{{{
             ::kernel::kunit_assert!(
-                "{kunit_name}", "{real_path}", __DOCTEST_ANCHOR - {line}, $cond
+                "{kunit_name}", c"{real_path}", __DOCTEST_ANCHOR - {line}, $cond
             );
         }}}}
     }}
@@ -184,7 +184,7 @@ macro_rules! assert {{
     macro_rules! assert_eq {{
         ($left:expr, $right:expr $(,)?) => {{{{
             ::kernel::kunit_assert_eq!(
-                "{kunit_name}", "{real_path}", __DOCTEST_ANCHOR - {line}, $left, $right
+                "{kunit_name}", c"{real_path}", __DOCTEST_ANCHOR - {line}, $left, $right
             );
         }}}}
     }}

-- 
2.51.0

[PATCH v2 10/19] rust: macros: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

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 <gregkh@linuxfoundation.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
---
 rust/macros/module.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rust/macros/module.rs b/rust/macros/module.rs
index 5ee54a00c0b6..8cef6cc958b5 100644
--- a/rust/macros/module.rs
+++ b/rust/macros/module.rs
@@ -228,7 +228,7 @@ pub(crate) fn module(ts: TokenStream) -> TokenStream {
             type LocalModule = {type_};
 
             impl ::kernel::ModuleMetadata for {type_} {{
-                const NAME: &'static ::kernel::str::CStr = ::kernel::c_str!(\"{name}\");
+                const NAME: &'static ::kernel::str::CStr = c\"{name}\";
             }}
 
             // Double nested modules, since then nobody can access the public items inside.

-- 
2.51.0

[PATCH v2 11/19] rust: miscdevice: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

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 <gregkh@linuxfoundation.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
---
 samples/rust/rust_misc_device.rs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/samples/rust/rust_misc_device.rs b/samples/rust/rust_misc_device.rs
index e7ab77448f75..60ab10b02574 100644
--- a/samples/rust/rust_misc_device.rs
+++ b/samples/rust/rust_misc_device.rs
@@ -98,7 +98,6 @@
 use core::pin::Pin;
 
 use kernel::{
-    c_str,
     device::Device,
     fs::File,
     ioctl::{_IO, _IOC_SIZE, _IOR, _IOW},
@@ -133,7 +132,7 @@ fn init(_module: &'static ThisModule) -> impl PinInit<Self, Error> {
         pr_info!("Initialising Rust Misc Device Sample\n");
 
         let options = MiscDeviceOptions {
-            name: c_str!("rust-misc-device"),
+            name: c"rust-misc-device",
         };
 
         try_pin_init!(Self {

-- 
2.51.0

[PATCH v2 12/19] rust: net: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

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 <gregkh@linuxfoundation.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
---
 rust/kernel/net/phy.rs | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/rust/kernel/net/phy.rs b/rust/kernel/net/phy.rs
index be1027b7961b..9aeb2bd16b58 100644
--- a/rust/kernel/net/phy.rs
+++ b/rust/kernel/net/phy.rs
@@ -780,7 +780,6 @@ const fn as_int(&self) -> u32 {
 ///
 /// ```
 /// # mod module_phy_driver_sample {
-/// use kernel::c_str;
 /// use kernel::net::phy::{self, DeviceId};
 /// use kernel::prelude::*;
 ///
@@ -799,7 +798,7 @@ const fn as_int(&self) -> u32 {
 ///
 /// #[vtable]
 /// impl phy::Driver for PhySample {
-///     const NAME: &'static CStr = c_str!("PhySample");
+///     const NAME: &'static CStr = c"PhySample";
 ///     const PHY_DEVICE_ID: phy::DeviceId = phy::DeviceId::new_with_exact_mask(0x00000001);
 /// }
 /// # }
@@ -808,7 +807,6 @@ const fn as_int(&self) -> u32 {
 /// This expands to the following code:
 ///
 /// ```ignore
-/// use kernel::c_str;
 /// use kernel::net::phy::{self, DeviceId};
 /// use kernel::prelude::*;
 ///
@@ -828,7 +826,7 @@ const fn as_int(&self) -> u32 {
 ///
 /// #[vtable]
 /// impl phy::Driver for PhySample {
-///     const NAME: &'static CStr = c_str!("PhySample");
+///     const NAME: &'static CStr = c"PhySample";
 ///     const PHY_DEVICE_ID: phy::DeviceId = phy::DeviceId::new_with_exact_mask(0x00000001);
 /// }
 ///

-- 
2.51.0

[PATCH v2 13/19] rust: pci: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

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 <gregkh@linuxfoundation.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Acked-by: Danilo Krummrich <dakr@kernel.org>
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
---
 samples/rust/rust_driver_pci.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/samples/rust/rust_driver_pci.rs b/samples/rust/rust_driver_pci.rs
index 606946ff4d7f..e0e9d9fda484 100644
--- a/samples/rust/rust_driver_pci.rs
+++ b/samples/rust/rust_driver_pci.rs
@@ -4,7 +4,7 @@
 //!
 //! To make this driver probe, QEMU must be run with `-device pci-testdev`.
 
-use kernel::{bindings, c_str, device::Core, devres::Devres, pci, prelude::*, types::ARef};
+use kernel::{bindings, device::Core, devres::Devres, pci, prelude::*, types::ARef};
 
 struct Regs;
 
@@ -79,7 +79,7 @@ fn probe(pdev: &pci::Device<Core>, info: &Self::IdInfo) -> Result<Pin<KBox<Self>
         let drvdata = KBox::pin_init(
             try_pin_init!(Self {
                 pdev: pdev.into(),
-                bar <- pdev.iomap_region_sized::<{ Regs::END }>(0, c_str!("rust_driver_pci")),
+                bar <- pdev.iomap_region_sized::<{ Regs::END }>(0, c"rust_driver_pci"),
                 index: *info,
             }),
             GFP_KERNEL,

-- 
2.51.0

[PATCH v2 14/19] rust: platform: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

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 <gregkh@linuxfoundation.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Acked-by: Danilo Krummrich <dakr@kernel.org>
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
---
 rust/kernel/platform.rs              |  6 +++---
 samples/rust/rust_driver_faux.rs     |  4 ++--
 samples/rust/rust_driver_platform.rs | 30 ++++++++++++++----------------
 3 files changed, 19 insertions(+), 21 deletions(-)

diff --git a/rust/kernel/platform.rs b/rust/kernel/platform.rs
index 8f028c76f9fa..d1cc5cee1cf5 100644
--- a/rust/kernel/platform.rs
+++ b/rust/kernel/platform.rs
@@ -135,7 +135,7 @@ macro_rules! module_platform_driver {
 /// # Examples
 ///
 ///```
-/// # use kernel::{acpi, bindings, c_str, device::Core, of, platform};
+/// # use kernel::{acpi, bindings, device::Core, of, platform};
 ///
 /// struct MyDriver;
 ///
@@ -144,7 +144,7 @@ macro_rules! module_platform_driver {
 ///     MODULE_OF_TABLE,
 ///     <MyDriver as platform::Driver>::IdInfo,
 ///     [
-///         (of::DeviceId::new(c_str!("test,device")), ())
+///         (of::DeviceId::new(c"test,device"), ())
 ///     ]
 /// );
 ///
@@ -153,7 +153,7 @@ macro_rules! module_platform_driver {
 ///     MODULE_ACPI_TABLE,
 ///     <MyDriver as platform::Driver>::IdInfo,
 ///     [
-///         (acpi::DeviceId::new(c_str!("LNUXBEEF")), ())
+///         (acpi::DeviceId::new(c"LNUXBEEF"), ())
 ///     ]
 /// );
 ///
diff --git a/samples/rust/rust_driver_faux.rs b/samples/rust/rust_driver_faux.rs
index ecc9fd378cbd..23add3160693 100644
--- a/samples/rust/rust_driver_faux.rs
+++ b/samples/rust/rust_driver_faux.rs
@@ -2,7 +2,7 @@
 
 //! Rust faux device sample.
 
-use kernel::{c_str, faux, prelude::*, Module};
+use kernel::{faux, prelude::*, Module};
 
 module! {
     type: SampleModule,
@@ -20,7 +20,7 @@ impl Module for SampleModule {
     fn init(_module: &'static ThisModule) -> Result<Self> {
         pr_info!("Initialising Rust Faux Device Sample\n");
 
-        let reg = faux::Registration::new(c_str!("rust-faux-sample-device"), None)?;
+        let reg = faux::Registration::new(c"rust-faux-sample-device", None)?;
 
         dev_info!(reg.as_ref(), "Hello from faux device!\n");
 
diff --git a/samples/rust/rust_driver_platform.rs b/samples/rust/rust_driver_platform.rs
index ad08df0d73f0..b3fe45a43043 100644
--- a/samples/rust/rust_driver_platform.rs
+++ b/samples/rust/rust_driver_platform.rs
@@ -63,7 +63,7 @@
 //!
 
 use kernel::{
-    acpi, c_str,
+    acpi,
     device::{
         self,
         property::{FwNodeReferenceArgs, NArgs},
@@ -85,14 +85,14 @@ struct SampleDriver {
     OF_TABLE,
     MODULE_OF_TABLE,
     <SampleDriver as platform::Driver>::IdInfo,
-    [(of::DeviceId::new(c_str!("test,rust-device")), Info(42))]
+    [(of::DeviceId::new(c"test,rust-device"), Info(42))]
 );
 
 kernel::acpi_device_table!(
     ACPI_TABLE,
     MODULE_ACPI_TABLE,
     <SampleDriver as platform::Driver>::IdInfo,
-    [(acpi::DeviceId::new(c_str!("LNUXBEEF")), Info(0))]
+    [(acpi::DeviceId::new(c"LNUXBEEF"), Info(0))]
 );
 
 impl platform::Driver for SampleDriver {
@@ -126,49 +126,47 @@ impl SampleDriver {
     fn properties_parse(dev: &device::Device) -> Result {
         let fwnode = dev.fwnode().ok_or(ENOENT)?;
 
-        if let Ok(idx) =
-            fwnode.property_match_string(c_str!("compatible"), c_str!("test,rust-device"))
-        {
+        if let Ok(idx) = fwnode.property_match_string(c"compatible", c"test,rust-device") {
             dev_info!(dev, "matched compatible string idx = {}\n", idx);
         }
 
-        let name = c_str!("compatible");
+        let name = c"compatible";
         let prop = fwnode.property_read::<CString>(name).required_by(dev)?;
         dev_info!(dev, "'{name}'='{prop:?}'\n");
 
-        let name = c_str!("test,bool-prop");
-        let prop = fwnode.property_read_bool(c_str!("test,bool-prop"));
+        let name = c"test,bool-prop";
+        let prop = fwnode.property_read_bool(c"test,bool-prop");
         dev_info!(dev, "'{name}'='{prop}'\n");
 
-        if fwnode.property_present(c_str!("test,u32-prop")) {
+        if fwnode.property_present(c"test,u32-prop") {
             dev_info!(dev, "'test,u32-prop' is present\n");
         }
 
-        let name = c_str!("test,u32-optional-prop");
+        let name = c"test,u32-optional-prop";
         let prop = fwnode.property_read::<u32>(name).or(0x12);
         dev_info!(dev, "'{name}'='{prop:#x}' (default = 0x12)\n");
 
         // A missing required property will print an error. Discard the error to
         // prevent properties_parse from failing in that case.
-        let name = c_str!("test,u32-required-prop");
+        let name = c"test,u32-required-prop";
         let _ = fwnode.property_read::<u32>(name).required_by(dev);
 
-        let name = c_str!("test,u32-prop");
+        let name = c"test,u32-prop";
         let prop: u32 = fwnode.property_read(name).required_by(dev)?;
         dev_info!(dev, "'{name}'='{prop:#x}'\n");
 
-        let name = c_str!("test,i16-array");
+        let name = c"test,i16-array";
         let prop: [i16; 4] = fwnode.property_read(name).required_by(dev)?;
         dev_info!(dev, "'{name}'='{prop:?}'\n");
         let len = fwnode.property_count_elem::<u16>(name)?;
         dev_info!(dev, "'{name}' length is {len}\n");
 
-        let name = c_str!("test,i16-array");
+        let name = c"test,i16-array";
         let prop: KVec<i16> = fwnode.property_read_array_vec(name, 4)?.required_by(dev)?;
         dev_info!(dev, "'{name}'='{prop:?}' (KVec)\n");
 
         for child in fwnode.children() {
-            let name = c_str!("test,ref-arg");
+            let name = c"test,ref-arg";
             let nargs = NArgs::N(2);
             let prop: FwNodeReferenceArgs = child.property_get_reference_args(name, nargs, 0)?;
             dev_info!(dev, "'{name}'='{prop:?}'\n");

-- 
2.51.0

[PATCH v2 15/19] rust: seq_file: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

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 <gregkh@linuxfoundation.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
---
 rust/kernel/seq_file.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/rust/kernel/seq_file.rs b/rust/kernel/seq_file.rs
index 855e533813a6..518265558d66 100644
--- a/rust/kernel/seq_file.rs
+++ b/rust/kernel/seq_file.rs
@@ -4,7 +4,7 @@
 //!
 //! C header: [`include/linux/seq_file.h`](srctree/include/linux/seq_file.h)
 
-use crate::{bindings, c_str, fmt, str::CStrExt as _, types::NotThreadSafe, types::Opaque};
+use crate::{bindings, fmt, str::CStrExt as _, types::NotThreadSafe, types::Opaque};
 
 /// A utility for generating the contents of a seq file.
 #[repr(transparent)]
@@ -36,7 +36,7 @@ pub fn call_printf(&self, args: fmt::Arguments<'_>) {
         unsafe {
             bindings::seq_printf(
                 self.inner.get(),
-                c_str!("%pA").as_char_ptr(),
+                c"%pA".as_char_ptr(),
                 core::ptr::from_ref(&args).cast::<crate::ffi::c_void>(),
             );
         }

-- 
2.51.0

[PATCH v2 16/19] rust: str: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

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 <gregkh@linuxfoundation.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
---
 rust/kernel/str.rs | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/rust/kernel/str.rs b/rust/kernel/str.rs
index 624386cb07be..4203ce34ce98 100644
--- a/rust/kernel/str.rs
+++ b/rust/kernel/str.rs
@@ -272,15 +272,14 @@ impl fmt::Display for CStr {
     /// Formats printable ASCII characters, escaping the rest.
     ///
     /// ```
-    /// # use kernel::c_str;
     /// # use kernel::prelude::fmt;
     /// # use kernel::str::CStr;
     /// # use kernel::str::CString;
-    /// let penguin = c_str!("🐧");
+    /// let penguin = c"🐧";
     /// let s = CString::try_from_fmt(fmt!("{penguin}"))?;
     /// assert_eq!(s.to_bytes_with_nul(), "\\xf0\\x9f\\x90\\xa7\0".as_bytes());
     ///
-    /// let ascii = c_str!("so \"cool\"");
+    /// let ascii = c"so \"cool\"";
     /// let s = CString::try_from_fmt(fmt!("{ascii}"))?;
     /// assert_eq!(s.to_bytes_with_nul(), "so \"cool\"\0".as_bytes());
     /// # Ok::<(), kernel::error::Error>(())

-- 
2.51.0

[PATCH v2 17/19] rust: sync: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

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 <gregkh@linuxfoundation.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
---
 drivers/block/rnull.rs         | 2 +-
 rust/kernel/sync.rs            | 5 ++---
 rust/kernel/sync/completion.rs | 2 +-
 rust/kernel/workqueue.rs       | 8 ++++----
 4 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/block/rnull.rs b/drivers/block/rnull.rs
index 6366da12c5a5..9aa79b862b63 100644
--- a/drivers/block/rnull.rs
+++ b/drivers/block/rnull.rs
@@ -55,7 +55,7 @@ fn init(_module: &'static ThisModule) -> impl PinInit<Self, Error> {
         })();
 
         try_pin_init!(Self {
-            _disk <- new_mutex!(disk?, "nullb:disk"),
+            _disk <- new_mutex!(disk?, c"nullb:disk"),
         })
     }
 }
diff --git a/rust/kernel/sync.rs b/rust/kernel/sync.rs
index 00f9b558a3ad..672411058a92 100644
--- a/rust/kernel/sync.rs
+++ b/rust/kernel/sync.rs
@@ -44,7 +44,6 @@ impl LockClassKey {
     ///
     /// # Examples
     /// ```
-    /// # use kernel::c_str;
     /// # use kernel::alloc::KBox;
     /// # use kernel::types::ForeignOwnable;
     /// # use kernel::sync::{LockClassKey, SpinLock};
@@ -56,7 +55,7 @@ impl LockClassKey {
     /// {
     ///     stack_pin_init!(let num: SpinLock<u32> = SpinLock::new(
     ///         0,
-    ///         c_str!("my_spinlock"),
+    ///         c"my_spinlock",
     ///         // SAFETY: `key_ptr` is returned by the above `into_foreign()`, whose
     ///         // `from_foreign()` has not yet been called.
     ///         unsafe { <Pin<KBox<LockClassKey>> as ForeignOwnable>::borrow(key_ptr) }
@@ -115,6 +114,6 @@ macro_rules! optional_name {
         $crate::c_str!(::core::concat!(::core::file!(), ":", ::core::line!()))
     };
     ($name:literal) => {
-        $crate::c_str!($name)
+        $name
     };
 }
diff --git a/rust/kernel/sync/completion.rs b/rust/kernel/sync/completion.rs
index c50012a940a3..97d39c248793 100644
--- a/rust/kernel/sync/completion.rs
+++ b/rust/kernel/sync/completion.rs
@@ -34,7 +34,7 @@
 /// impl MyTask {
 ///     fn new() -> Result<Arc<Self>> {
 ///         let this = Arc::pin_init(pin_init!(MyTask {
-///             work <- new_work!("MyTask::work"),
+///             work <- new_work!(c"MyTask::work"),
 ///             done <- Completion::new(),
 ///         }), GFP_KERNEL)?;
 ///
diff --git a/rust/kernel/workqueue.rs b/rust/kernel/workqueue.rs
index b9343d5bc00f..261b827235ae 100644
--- a/rust/kernel/workqueue.rs
+++ b/rust/kernel/workqueue.rs
@@ -51,7 +51,7 @@
 //!     fn new(value: i32) -> Result<Arc<Self>> {
 //!         Arc::pin_init(pin_init!(MyStruct {
 //!             value,
-//!             work <- new_work!("MyStruct::work"),
+//!             work <- new_work!(c"MyStruct::work"),
 //!         }), GFP_KERNEL)
 //!     }
 //! }
@@ -98,8 +98,8 @@
 //!         Arc::pin_init(pin_init!(MyStruct {
 //!             value_1,
 //!             value_2,
-//!             work_1 <- new_work!("MyStruct::work_1"),
-//!             work_2 <- new_work!("MyStruct::work_2"),
+//!             work_1 <- new_work!(c"MyStruct::work_1"),
+//!             work_2 <- new_work!(c"MyStruct::work_2"),
 //!         }), GFP_KERNEL)
 //!     }
 //! }
@@ -337,7 +337,7 @@ pub fn try_spawn<T: 'static + Send + FnOnce()>(
         func: T,
     ) -> Result<(), AllocError> {
         let init = pin_init!(ClosureWork {
-            work <- new_work!("Queue::try_spawn"),
+            work <- new_work!(c"Queue::try_spawn"),
             func: Some(func),
         });
 

-- 
2.51.0

[PATCH v2 18/19] rust: io: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

C-String literals were added in Rust 1.77. Replace instances of
`kernel::c_str!` with C-String literals where possible.

Signed-off-by: Tamir Duberstein <tamird@gmail.com>
---
 rust/kernel/io/mem.rs | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/rust/kernel/io/mem.rs b/rust/kernel/io/mem.rs
index 6f99510bfc3a..2e42eb906061 100644
--- a/rust/kernel/io/mem.rs
+++ b/rust/kernel/io/mem.rs
@@ -4,7 +4,6 @@
 
 use core::ops::Deref;
 
-use crate::c_str;
 use crate::device::Bound;
 use crate::device::Device;
 use crate::devres::Devres;
@@ -44,7 +43,7 @@ pub(crate) unsafe fn new(device: &'a Device<Bound>, resource: &'a Resource) -> S
     /// illustration purposes.
     ///
     /// ```no_run
-    /// use kernel::{bindings, c_str, platform, of, device::Core};
+    /// use kernel::{bindings, platform, of, device::Core};
     /// struct SampleDriver;
     ///
     /// impl platform::Driver for SampleDriver {
@@ -102,7 +101,7 @@ pub fn iomap_exclusive_sized<const SIZE: usize>(
     /// illustration purposes.
     ///
     /// ```no_run
-    /// use kernel::{bindings, c_str, platform, of, device::Core};
+    /// use kernel::{bindings, platform, of, device::Core};
     /// struct SampleDriver;
     ///
     /// impl platform::Driver for SampleDriver {
@@ -164,7 +163,7 @@ impl<const SIZE: usize> ExclusiveIoMem<SIZE> {
     fn ioremap(resource: &Resource) -> Result<Self> {
         let start = resource.start();
         let size = resource.size();
-        let name = resource.name().unwrap_or(c_str!(""));
+        let name = resource.name().unwrap_or_default();
 
         let region = resource
             .request_region(

-- 
2.51.0

Re: [PATCH v2 18/19] rust: io: replace `kernel::c_str!` with C-Strings

[Benno Lossin]

On Thu Sep 25, 2025 at 3:54 PM CEST, Tamir Duberstein wrote:
> C-String literals were added in Rust 1.77. Replace instances of
> `kernel::c_str!` with C-String literals where possible.
>
> Signed-off-by: Tamir Duberstein <tamird@gmail.com>

Reviewed-by: Benno Lossin <lossin@kernel.org>

---
Cheers,
Benno

> ---
>  rust/kernel/io/mem.rs | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)

Re: [PATCH v2 18/19] rust: io: replace `kernel::c_str!` with C-Strings

[Danilo Krummrich]

On 9/25/25 3:54 PM, Tamir Duberstein wrote:
> C-String literals were added in Rust 1.77. Replace instances of
> `kernel::c_str!` with C-String literals where possible.
> 
> Signed-off-by: Tamir Duberstein <tamird@gmail.com>

Acked-by: Danilo Krummrich <dakr@kernel.org>

[PATCH v2 19/19] rust: regulator: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

C-String literals were added in Rust 1.77. Replace instances of
`kernel::c_str!` with C-String literals where possible.

Signed-off-by: Tamir Duberstein <tamird@gmail.com>
---
 rust/kernel/regulator.rs | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/rust/kernel/regulator.rs b/rust/kernel/regulator.rs
index 65f3a125348f..dff8fb00566f 100644
--- a/rust/kernel/regulator.rs
+++ b/rust/kernel/regulator.rs
@@ -98,12 +98,11 @@ pub struct Error<State: RegulatorState> {
 ///
 /// ```
 /// # use kernel::prelude::*;
-/// # use kernel::c_str;
 /// # use kernel::device::Device;
 /// # use kernel::regulator::{Voltage, Regulator, Disabled, Enabled};
 /// fn enable(dev: &Device, min_voltage: Voltage, max_voltage: Voltage) -> Result {
 ///     // Obtain a reference to a (fictitious) regulator.
-///     let regulator: Regulator<Disabled> = Regulator::<Disabled>::get(dev, c_str!("vcc"))?;
+///     let regulator: Regulator<Disabled> = Regulator::<Disabled>::get(dev, c"vcc")?;
 ///
 ///     // The voltage can be set before enabling the regulator if needed, e.g.:
 ///     regulator.set_voltage(min_voltage, max_voltage)?;
@@ -142,12 +141,11 @@ pub struct Error<State: RegulatorState> {
 ///
 /// ```
 /// # use kernel::prelude::*;
-/// # use kernel::c_str;
 /// # use kernel::device::Device;
 /// # use kernel::regulator::{Voltage, Regulator, Enabled};
 /// fn enable(dev: &Device) -> Result {
 ///     // Obtain a reference to a (fictitious) regulator and enable it.
-///     let regulator: Regulator<Enabled> = Regulator::<Enabled>::get(dev, c_str!("vcc"))?;
+///     let regulator: Regulator<Enabled> = Regulator::<Enabled>::get(dev, c"vcc")?;
 ///
 ///     // Dropping an enabled regulator will disable it. The refcount will be
 ///     // decremented.
@@ -193,7 +191,6 @@ pub struct Error<State: RegulatorState> {
 ///
 /// ```
 /// # use kernel::prelude::*;
-/// # use kernel::c_str;
 /// # use kernel::device::Device;
 /// # use kernel::regulator::{Regulator, Dynamic};
 /// struct PrivateData {
@@ -203,7 +200,7 @@ pub struct Error<State: RegulatorState> {
 /// // A fictictious probe function that obtains a regulator and sets it up.
 /// fn probe(dev: &Device) -> Result<PrivateData> {
 ///     // Obtain a reference to a (fictitious) regulator.
-///     let mut regulator = Regulator::<Dynamic>::get(dev, c_str!("vcc"))?;
+///     let mut regulator = Regulator::<Dynamic>::get(dev, c"vcc")?;
 ///
 ///     Ok(PrivateData { regulator })
 /// }

-- 
2.51.0

Re: [PATCH v2 19/19] rust: regulator: replace `kernel::c_str!` with C-Strings

[Benno Lossin]

On Thu Sep 25, 2025 at 3:54 PM CEST, Tamir Duberstein wrote:
> C-String literals were added in Rust 1.77. Replace instances of
> `kernel::c_str!` with C-String literals where possible.
>
> Signed-off-by: Tamir Duberstein <tamird@gmail.com>

Reviewed-by: Benno Lossin <lossin@kernel.org>

---
Cheers,
Benno

> ---
>  rust/kernel/regulator.rs | 9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)

Re: [PATCH v2 00/19] rust: replace `kernel::c_str!` with C-Strings

[Mark Brown]

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On Thu, Sep 25, 2025 at 09:53:48AM -0400, Tamir Duberstein wrote:
> This series depends on step 3[0].
> 
> Subsystem maintainers: I would appreciate your `Acked-by`s so that this
> can be taken through Miguel's tree (where the previous series must go).

Given that we're almost at the merge window isn't it likely that these
will get applied once the current rust tree is in mainline?

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Re: [PATCH v2 00/19] rust: replace `kernel::c_str!` with C-Strings

[Miguel Ojeda]

On Thu, Sep 25, 2025 at 4:01 PM Mark Brown <broonie@debian.org> wrote:
>
> Given that we're almost at the merge window isn't it likely that these
> will get applied once the current rust tree is in mainline?

Yeah, I am submitting the PR to Linus very soon anyway.

Cheers,
Miguel

Re: [PATCH v2 00/19] rust: replace `kernel::c_str!` with C-Strings

[Miguel Ojeda]

On Thu, Sep 25, 2025 at 3:54 PM Tamir Duberstein <tamird@gmail.com> wrote:
>
> Changes in v2:

For future reference, this is v3.

Cheers,
Miguel