linux-kernel - Re: [PATCH v17 00/11] rust: replace kernel::str::CStr w/ core::ffi::CStr

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Message-ID: <aPPJ2qDhxXNh8360@google.com>
Date: Sat, 18 Oct 2025 17:09:46 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: Tamir Duberstein <tamird@...il.com>
Cc: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	"Björn Roy Baron" <bjorn3_gh@...tonmail.com>, Benno Lossin <lossin@...nel.org>, 
	Andreas Hindborg <a.hindborg@...nel.org>, Trevor Gross <tmgross@...ch.edu>, 
	Danilo Krummrich <dakr@...nel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	"Rafael J. Wysocki" <rafael@...nel.org>, Luis Chamberlain <mcgrof@...nel.org>, 
	Russ Weight <russ.weight@...ux.dev>, Peter Zijlstra <peterz@...radead.org>, 
	Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>, Waiman Long <longman@...hat.com>, 
	Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <nick.desaulniers+lkml@...il.com>, 
	Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>, 
	Christian Brauner <brauner@...nel.org>, Alexander Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>, 
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	Suren Baghdasaryan <surenb@...gle.com>, Jens Axboe <axboe@...nel.dk>, 
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, Vlastimil Babka <vbabka@...e.cz>, 
	"Liam R. Howlett" <Liam.Howlett@...cle.com>, Uladzislau Rezki <urezki@...il.com>, 
	Bjorn Helgaas <bhelgaas@...gle.com>, 
	"Krzysztof Wilczyński" <kwilczynski@...nel.org>, rust-for-linux@...r.kernel.org, 
	linux-kernel@...r.kernel.org, llvm@...ts.linux.dev, 
	linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org, 
	linux-pci@...r.kernel.org
Subject: Re: [PATCH v17 00/11] rust: replace kernel::str::CStr w/ core::ffi::CStr

On Sat, Oct 18, 2025 at 05:02:39PM +0000, Alice Ryhl wrote:
> On Wed, Oct 15, 2025 at 03:24:30PM -0400, Tamir Duberstein wrote:
> > This picks up from Michal Rostecki's work[0]. Per Michal's guidance I
> > have omitted Co-authored tags, as the end result is quite different.
> > 
> > This series is intended to be taken through rust-next. The final patch
> > in the series requires some other subsystems' `Acked-by`s:
> > - drivers/android/binder/stats.rs: rust_binder. Alice, could you take a
> >   look?
> > - rust/kernel/device.rs: driver-core. Already acked by gregkh.
> > - rust/kernel/firmware.rs: driver-core. Danilo, could you take a look?
> > - rust/kernel/seq_file.rs: vfs. Christian, could you take a look?
> > - rust/kernel/sync/*: locking-core. Boqun, could you take a look?
> > 
> > Link: https://lore.kernel.org/rust-for-linux/20240819153656.28807-2-vadorovsky@protonmail.com/t/#u [0]
> > Closes: https://github.com/Rust-for-Linux/linux/issues/1075
> > 
> > Signed-off-by: Tamir Duberstein <tamird@...il.com>
> 
> You need a few more changes:

One more:

diff --git a/rust/kernel/drm/ioctl.rs b/rust/kernel/drm/ioctl.rs
index 69efbdb4c85a..5489961a62ca 100644
--- a/rust/kernel/drm/ioctl.rs
+++ b/rust/kernel/drm/ioctl.rs
@@ -156,7 +156,7 @@ macro_rules! declare_drm_ioctls {
                         Some($cmd)
                     },
                     flags: $flags,
-                    name: $crate::c_str!(::core::stringify!($cmd)).as_char_ptr(),
+                    name: $crate::str::as_char_ptr_in_const_context($crate::c_str!(::core::stringify!($cmd))),
                 }
             ),*];
             ioctls