linux-kernel - Re: linux-next: manual merge of the rust tree with the driver-core tree

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Message-ID: <20251121153906.1d306ad1@canb.auug.org.au>
Date: Fri, 21 Nov 2025 15:39:06 +1100
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc: Tamir Duberstein <tamird@...il.com>, Igor Korotin
 <igor.korotin.linux@...il.com>, Miguel Ojeda <ojeda@...nel.org>, Greg KH
 <greg@...ah.com>, Danilo Krummrich <dakr@...nel.org>, "Rafael J. Wysocki"
 <rafael@...nel.org>, Linux Kernel Mailing List
 <linux-kernel@...r.kernel.org>, Linux Next Mailing List
 <linux-next@...r.kernel.org>
Subject: Re: linux-next: manual merge of the rust tree with the driver-core
 tree

Hi all,

On Thu, 20 Nov 2025 06:27:13 -0500 Tamir Duberstein <tamird@...il.com> wrote:
>
> On Thu, Nov 20, 2025 at 4:15 AM Miguel Ojeda <miguel.ojeda.sandonis@...il.com> wrote:
> >
> > On Thu, Nov 20, 2025 at 8:11 AM Stephen Rothwell <sfr@...b.auug.org.au> wrote:  
> > >
> > > I have applied the following (hack) merge resolution for today.  
> >
> > Thanks a lot Stephen for taking the time to do that instead of dropping it.
> >
> > We should be able to do the same as Tamir did in commit 657403637f7d
> > ("rust: acpi: use `core::ffi::CStr` method names"), i.e. move the
> > build assert below to then be able to use `len()` instead:
> >
> > diff --git a/rust/kernel/i2c.rs b/rust/kernel/i2c.rs
> > index aea1b44d189b..f67c355c988e 100644
> > --- a/rust/kernel/i2c.rs
> > +++ b/rust/kernel/i2c.rs
> > @@ -43,11 +43,8 @@ impl DeviceId {
> >      /// Create a new device id from an I2C 'id' string.
> >      #[inline(always)]
> >      pub const fn new(id: &'static CStr) -> Self {
> > -        build_assert!(
> > -            id.len_with_nul() <= Self::I2C_NAME_SIZE,
> > -            "ID exceeds 20 bytes"
> > -        );
> > -        let src = id.as_bytes_with_nul();
> > +        let src = id.to_bytes_with_nul();
> > +        build_assert!(src.len() <= Self::I2C_NAME_SIZE, "ID exceeds 20 bytes");
> >          let mut i2c: bindings::i2c_device_id = pin_init::zeroed();
> >          let mut i = 0;
> >          while i < src.len() {
> > @@ -433,11 +430,8 @@ impl I2cBoardInfo {
> >      /// Create a new [`I2cBoardInfo`] for a kernel driver.
> >      #[inline(always)]
> >      pub const fn new(type_: &'static CStr, addr: u16) -> Self {
> > -        build_assert!(
> > -            type_.len_with_nul() <= Self::I2C_TYPE_SIZE,
> > -            "Type exceeds 20 bytes"
> > -        );
> > -        let src = type_.as_bytes_with_nul();
> > +        let src = type_.to_bytes_with_nul();
> > +        build_assert!(src.len() <= Self::I2C_TYPE_SIZE, "Type exceeds
> > 20 bytes");
> >          let mut i2c_board_info: bindings::i2c_board_info = pin_init::zeroed();
> >          let mut i: usize = 0;
> >          while i < src.len() {
> >
> > Igor/Tamir?  
> 
> Yep, looks correct to me!

OK, I have used that from today.

Could that fix just be applied to the driver-core tree now?  Or does it
depend on changes in the rust tree?

-- 
Cheers,
Stephen Rothwell

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