[PATCH] rust: seq_file: replace `kernel::c_str!` with C-Strings

[PATCH] rust: seq_file: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

From: Tamir Duberstein <tamird@gmail.com>

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>(),
             );
         }

---
base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
change-id: 20251222-cstr-vfs-55ca2ceca0a4

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

Re: [PATCH] rust: seq_file: replace `kernel::c_str!` with C-Strings

[Daniel Almeida]

> On 22 Dec 2025, at 09:18, Tamir Duberstein <tamird@kernel.org> wrote:
> 
> From: Tamir Duberstein <tamird@gmail.com>
> 
> 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>(),
>             );
>         }
> 
> ---
> base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
> change-id: 20251222-cstr-vfs-55ca2ceca0a4
> 
> Best regards,
> --  
> Tamir Duberstein <tamird@gmail.com>
> 
> 

Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>

Re: [PATCH] rust: seq_file: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

On Mon, Dec 22, 2025 at 7:19 AM Tamir Duberstein <tamird@kernel.org> wrote:
>
> From: Tamir Duberstein <tamird@gmail.com>
>
> 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>(),
>              );
>          }
>
> ---
> base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
> change-id: 20251222-cstr-vfs-55ca2ceca0a4
>
> Best regards,
> --
> Tamir Duberstein <tamird@gmail.com>
>

@Christian could you please have a look?

Cheers.
Tamir

Re: [PATCH] rust: seq_file: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

On Sat, Jan 3, 2026 at 9:29 PM Tamir Duberstein <tamird@gmail.com> wrote:
>
> On Mon, Dec 22, 2025 at 7:19 AM Tamir Duberstein <tamird@kernel.org> wrote:
> >
> > From: Tamir Duberstein <tamird@gmail.com>
> >
> > 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>(),
> >              );
> >          }
> >
> > ---
> > base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
> > change-id: 20251222-cstr-vfs-55ca2ceca0a4
> >
> > Best regards,
> > --
> > Tamir Duberstein <tamird@gmail.com>
> >
>
> @Christian could you please have a look?
>
> Cheers.
> Tamir

Alexander or Christian: could you please take this through vfs or
would you be ok with it going through rust-next?

Re: [PATCH] rust: seq_file: replace `kernel::c_str!` with C-Strings

[Miguel Ojeda]

On Mon, Jan 19, 2026 at 1:53 PM Tamir Duberstein <tamird@gmail.com> wrote:
>
> Alexander or Christian: could you please take this through vfs or
> would you be ok with it going through rust-next?

Either seems good to me, thanks!

For context, this is part of a long migration:

    https://github.com/Rust-for-Linux/linux/issues/1075
    https://lore.kernel.org/all/20250704-core-cstr-prepare-v1-0-a91524037783@gmail.com/

Cheers,
Miguel

Re: [PATCH] rust: seq_file: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

On Mon, Jan 19, 2026 at 12:59 PM Miguel Ojeda
<miguel.ojeda.sandonis@gmail.com> wrote:
>
> On Mon, Jan 19, 2026 at 1:53 PM Tamir Duberstein <tamird@gmail.com> wrote:
> >
> > Alexander or Christian: could you please take this through vfs or
> > would you be ok with it going through rust-next?
>
> Either seems good to me, thanks!
>
> For context, this is part of a long migration:
>
>     https://github.com/Rust-for-Linux/linux/issues/1075
>     https://lore.kernel.org/all/20250704-core-cstr-prepare-v1-0-a91524037783@gmail.com/
>
> Cheers,
> Miguel

Another ping here, folks! Miguel, what can we do if we do not hear
from the vfs maintainers?

Re: [PATCH] rust: seq_file: replace `kernel::c_str!` with C-Strings

[Christian Brauner]

On Mon, 22 Dec 2025 13:18:57 +0100, Tamir Duberstein wrote:
> C-String literals were added in Rust 1.77. Replace instances of
> `kernel::c_str!` with C-String literals where possible.
> 
> 

Applied to the vfs-7.0.misc branch of the vfs/vfs.git tree.
Patches in the vfs-7.0.misc branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs-7.0.misc

[1/1] rust: seq_file: replace `kernel::c_str!` with C-Strings
      https://git.kernel.org/vfs/vfs/c/40210c2b11a8

Re: [PATCH] rust: seq_file: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

On Thu, Jan 29, 2026 at 9:33 AM Christian Brauner <brauner@kernel.org> wrote:
>
> On Mon, 22 Dec 2025 13:18:57 +0100, Tamir Duberstein wrote:
> > C-String literals were added in Rust 1.77. Replace instances of
> > `kernel::c_str!` with C-String literals where possible.
> >
> >
>
> Applied to the vfs-7.0.misc branch of the vfs/vfs.git tree.
> Patches in the vfs-7.0.misc branch should appear in linux-next soon.
>
> Please report any outstanding bugs that were missed during review in a
> new review to the original patch series allowing us to drop it.
>
> It's encouraged to provide Acked-bys and Reviewed-bys even though the
> patch has now been applied. If possible patch trailers will be updated.
>
> Note that commit hashes shown below are subject to change due to rebase,
> trailer updates or similar. If in doubt, please check the listed branch.
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
> branch: vfs-7.0.misc
>
> [1/1] rust: seq_file: replace `kernel::c_str!` with C-Strings
>       https://git.kernel.org/vfs/vfs/c/40210c2b11a8

Thanks Cristian. The commit doesn't seem to exist (with this hash or
any other, see https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git/log/?h=vfs-7.0.misc).
Is this expected?

Cheers.
Tamir

Re: [PATCH] rust: seq_file: replace `kernel::c_str!` with C-Strings

[Miguel Ojeda]

On Thu, Jan 29, 2026 at 4:14 PM Tamir Duberstein <tamird@kernel.org> wrote:
>
> Thanks Cristian. The commit doesn't seem to exist (with this hash or
> any other, see https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git/log/?h=vfs-7.0.misc).
> Is this expected?

Christian may not have pushed the batch yet, given the dates in the repository.

Cheers,
Miguel

Re: [PATCH] rust: seq_file: replace `kernel::c_str!` with C-Strings

[Tamir Duberstein]

On Thu, Jan 29, 2026 at 10:20 AM Miguel Ojeda
<miguel.ojeda.sandonis@gmail.com> wrote:
>
> On Thu, Jan 29, 2026 at 4:14 PM Tamir Duberstein <tamird@kernel.org> wrote:
> >
> > Thanks Cristian. The commit doesn't seem to exist (with this hash or
> > any other, see https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git/log/?h=vfs-7.0.misc).
> > Is this expected?
>
> Christian may not have pushed the batch yet, given the dates in the repository.

Indeed, and that remains true now. Unfortunately this commit wont land
in linux-next until pushed, which is making me a bit worried about
discovering last-minute breakage.