Hi all,

Today's linux-next merge of the rust tree got a conflict in:

  rust/kernel/miscdevice.rs

between commit:

  0d8a7c7bf47a ("rust: miscdevice: access file in fops")

from the driver-core tree and commit:

  27c7518e7f1c ("rust: finish using custom FFI integer types")
  1bae8729e50a ("rust: map `long` to `isize` and `char` to `u8`")

from the rust tree.

I fixed it up (see below) and can carry the fix as necessary. This
is now fixed as far as linux-next is concerned, but any non trivial
conflicts should be mentioned to your upstream maintainer when your tree
is submitted for merging.  You may also want to consider cooperating
with the maintainer of the conflicting tree to minimise any particularly
complex conflicts.

-- 
Cheers,
Stephen Rothwell

diff --cc rust/kernel/miscdevice.rs
index ebc82e7dfc80,8f88891fb1d2..000000000000
--- a/rust/kernel/miscdevice.rs
+++ b/rust/kernel/miscdevice.rs
@@@ -10,11 -10,9 +10,12 @@@
  
  use crate::{
      bindings,
 +    device::Device,
      error::{to_result, Error, Result, VTABLE_DEFAULT_ERROR},
+     ffi::{c_int, c_long, c_uint, c_ulong},
 +    fs::File,
      prelude::*,
 +    seq_file::SeqFile,
      str::CStr,
      types::{ForeignOwnable, Opaque},
  };
@@@ -274,12 -225,7 +270,12 @@@ unsafe extern "C" fn fops_ioctl<T: Misc
      // SAFETY: Ioctl calls can borrow the private data of the file.
      let device = unsafe { <T::Ptr as ForeignOwnable>::borrow(private) };
  
 -    match T::ioctl(device, cmd, arg) {
 +    // SAFETY:
 +    // * The file is valid for the duration of this call.
 +    // * There is no active fdget_pos region on the file on this thread.
 +    let file = unsafe { File::from_raw_file(file) };
 +
-     match T::ioctl(device, file, cmd, arg as usize) {
++    match T::ioctl(device, file, cmd, arg) {
          Ok(ret) => ret as c_long,
          Err(err) => err.to_errno() as c_long,
      }
@@@ -299,12 -245,7 +295,12 @@@ unsafe extern "C" fn fops_compat_ioctl<
      // SAFETY: Ioctl calls can borrow the private data of the file.
      let device = unsafe { <T::Ptr as ForeignOwnable>::borrow(private) };
  
 -    match T::compat_ioctl(device, cmd, arg) {
 +    // SAFETY:
 +    // * The file is valid for the duration of this call.
 +    // * There is no active fdget_pos region on the file on this thread.
 +    let file = unsafe { File::from_raw_file(file) };
 +
-     match T::compat_ioctl(device, file, cmd, arg as usize) {
++    match T::compat_ioctl(device, file, cmd, arg) {
          Ok(ret) => ret as c_long,
          Err(err) => err.to_errno() as c_long,
      }

On Tue, Dec 17, 2024 at 4:10 AM Stephen Rothwell <sfr@canb.auug.org.au> wrote:
>
> I fixed it up (see below) and can carry the fix as necessary. This
> is now fixed as far as linux-next is concerned, but any non trivial
> conflicts should be mentioned to your upstream maintainer when your tree
> is submitted for merging.  You may also want to consider cooperating
> with the maintainer of the conflicting tree to minimise any particularly
> complex conflicts.

Sorry, I missed to reply earlier, but this looked good to me too.

Thanks!

Cheers,
Miguel

On Tue, Dec 17, 2024 at 02:09:39PM +1100, Stephen Rothwell wrote:
> Hi all,
> 
> Today's linux-next merge of the rust tree got a conflict in:
> 
>   rust/kernel/miscdevice.rs
> 
> between commit:
> 
>   0d8a7c7bf47a ("rust: miscdevice: access file in fops")
> 
> from the driver-core tree and commit:
> 
>   27c7518e7f1c ("rust: finish using custom FFI integer types")
>   1bae8729e50a ("rust: map `long` to `isize` and `char` to `u8`")
> 
> from the rust tree.
> 
> I fixed it up (see below) and can carry the fix as necessary. This
> is now fixed as far as linux-next is concerned, but any non trivial
> conflicts should be mentioned to your upstream maintainer when your tree
> is submitted for merging.  You may also want to consider cooperating
> with the maintainer of the conflicting tree to minimise any particularly
> complex conflicts.
> 
> -- 
> Cheers,
> Stephen Rothwell
> 
> diff --cc rust/kernel/miscdevice.rs
> index ebc82e7dfc80,8f88891fb1d2..000000000000
> --- a/rust/kernel/miscdevice.rs
> +++ b/rust/kernel/miscdevice.rs
> @@@ -10,11 -10,9 +10,12 @@@
>   
>   use crate::{
>       bindings,
>  +    device::Device,
>       error::{to_result, Error, Result, VTABLE_DEFAULT_ERROR},
> +     ffi::{c_int, c_long, c_uint, c_ulong},
>  +    fs::File,
>       prelude::*,
>  +    seq_file::SeqFile,
>       str::CStr,
>       types::{ForeignOwnable, Opaque},
>   };
> @@@ -274,12 -225,7 +270,12 @@@ unsafe extern "C" fn fops_ioctl<T: Misc
>       // SAFETY: Ioctl calls can borrow the private data of the file.
>       let device = unsafe { <T::Ptr as ForeignOwnable>::borrow(private) };
>   
>  -    match T::ioctl(device, cmd, arg) {
>  +    // SAFETY:
>  +    // * The file is valid for the duration of this call.
>  +    // * There is no active fdget_pos region on the file on this thread.
>  +    let file = unsafe { File::from_raw_file(file) };
>  +
> -     match T::ioctl(device, file, cmd, arg as usize) {
> ++    match T::ioctl(device, file, cmd, arg) {
>           Ok(ret) => ret as c_long,
>           Err(err) => err.to_errno() as c_long,
>       }
> @@@ -299,12 -245,7 +295,12 @@@ unsafe extern "C" fn fops_compat_ioctl<
>       // SAFETY: Ioctl calls can borrow the private data of the file.
>       let device = unsafe { <T::Ptr as ForeignOwnable>::borrow(private) };
>   
>  -    match T::compat_ioctl(device, cmd, arg) {
>  +    // SAFETY:
>  +    // * The file is valid for the duration of this call.
>  +    // * There is no active fdget_pos region on the file on this thread.
>  +    let file = unsafe { File::from_raw_file(file) };
>  +
> -     match T::compat_ioctl(device, file, cmd, arg as usize) {
> ++    match T::compat_ioctl(device, file, cmd, arg) {
>           Ok(ret) => ret as c_long,
>           Err(err) => err.to_errno() as c_long,
>       }


Looks good to me, thansk!

greg k-h