linux-kernel - Re: [PATCH 2/2] rust: ioctl: Move to the uapi crate

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Date:   Wed, 29 Mar 2023 21:29:41 +0100
From:   Gary Guo <gary@...yguo.net>
To:     Asahi Lina <lina@...hilina.net>
Cc:     Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org,
        asahi@...ts.linux.dev
Subject: Re: [PATCH 2/2] rust: ioctl: Move to the uapi crate

On Wed, 29 Mar 2023 20:40:19 +0900
Asahi Lina <lina@...hilina.net> wrote:

> Now that we have the uapi crate, this abstraction can use that instead
> of bindings.

These functions really just reflect macros in uapi ioctl.h, maybe
these should just be part of the uapi crate?

Best,
Gary

> 
> Signed-off-by: Asahi Lina <lina@...hilina.net>
> ---
>  rust/kernel/ioctl.rs | 32 ++++++++++++++++----------------
>  1 file changed, 16 insertions(+), 16 deletions(-)
> 
> diff --git a/rust/kernel/ioctl.rs b/rust/kernel/ioctl.rs
> index b2076113b6a8..007437959395 100644
> --- a/rust/kernel/ioctl.rs
> +++ b/rust/kernel/ioctl.rs
> @@ -10,40 +10,40 @@ use crate::build_assert;
>  /// Build an ioctl number, analogous to the C macro of the same name.
>  #[inline(always)]
>  const fn _IOC(dir: u32, ty: u32, nr: u32, size: usize) -> u32 {
> -    build_assert!(dir <= bindings::_IOC_DIRMASK);
> -    build_assert!(ty <= bindings::_IOC_TYPEMASK);
> -    build_assert!(nr <= bindings::_IOC_NRMASK);
> -    build_assert!(size <= (bindings::_IOC_SIZEMASK as usize));
> +    build_assert!(dir <= uapi::_IOC_DIRMASK);
> +    build_assert!(ty <= uapi::_IOC_TYPEMASK);
> +    build_assert!(nr <= uapi::_IOC_NRMASK);
> +    build_assert!(size <= (uapi::_IOC_SIZEMASK as usize));
>  
> -    (dir << bindings::_IOC_DIRSHIFT)
> -        | (ty << bindings::_IOC_TYPESHIFT)
> -        | (nr << bindings::_IOC_NRSHIFT)
> -        | ((size as u32) << bindings::_IOC_SIZESHIFT)
> +    (dir << uapi::_IOC_DIRSHIFT)
> +        | (ty << uapi::_IOC_TYPESHIFT)
> +        | (nr << uapi::_IOC_NRSHIFT)
> +        | ((size as u32) << uapi::_IOC_SIZESHIFT)
>  }
>  
>  /// Build an ioctl number for an argumentless ioctl.
>  #[inline(always)]
>  pub const fn _IO(ty: u32, nr: u32) -> u32 {
> -    _IOC(bindings::_IOC_NONE, ty, nr, 0)
> +    _IOC(uapi::_IOC_NONE, ty, nr, 0)
>  }
>  
>  /// Build an ioctl number for an read-only ioctl.
>  #[inline(always)]
>  pub const fn _IOR<T>(ty: u32, nr: u32) -> u32 {
> -    _IOC(bindings::_IOC_READ, ty, nr, core::mem::size_of::<T>())
> +    _IOC(uapi::_IOC_READ, ty, nr, core::mem::size_of::<T>())
>  }
>  
>  /// Build an ioctl number for an write-only ioctl.
>  #[inline(always)]
>  pub const fn _IOW<T>(ty: u32, nr: u32) -> u32 {
> -    _IOC(bindings::_IOC_WRITE, ty, nr, core::mem::size_of::<T>())
> +    _IOC(uapi::_IOC_WRITE, ty, nr, core::mem::size_of::<T>())
>  }
>  
>  /// Build an ioctl number for a read-write ioctl.
>  #[inline(always)]
>  pub const fn _IOWR<T>(ty: u32, nr: u32) -> u32 {
>      _IOC(
> -        bindings::_IOC_READ | bindings::_IOC_WRITE,
> +        uapi::_IOC_READ | uapi::_IOC_WRITE,
>          ty,
>          nr,
>          core::mem::size_of::<T>(),
> @@ -52,20 +52,20 @@ pub const fn _IOWR<T>(ty: u32, nr: u32) -> u32 {
>  
>  /// Get the ioctl direction from an ioctl number.
>  pub const fn _IOC_DIR(nr: u32) -> u32 {
> -    (nr >> bindings::_IOC_DIRSHIFT) & bindings::_IOC_DIRMASK
> +    (nr >> uapi::_IOC_DIRSHIFT) & uapi::_IOC_DIRMASK
>  }
>  
>  /// Get the ioctl type from an ioctl number.
>  pub const fn _IOC_TYPE(nr: u32) -> u32 {
> -    (nr >> bindings::_IOC_TYPESHIFT) & bindings::_IOC_TYPEMASK
> +    (nr >> uapi::_IOC_TYPESHIFT) & uapi::_IOC_TYPEMASK
>  }
>  
>  /// Get the ioctl number from an ioctl number.
>  pub const fn _IOC_NR(nr: u32) -> u32 {
> -    (nr >> bindings::_IOC_NRSHIFT) & bindings::_IOC_NRMASK
> +    (nr >> uapi::_IOC_NRSHIFT) & uapi::_IOC_NRMASK
>  }
>  
>  /// Get the ioctl size from an ioctl number.
>  pub const fn _IOC_SIZE(nr: u32) -> usize {
> -    ((nr >> bindings::_IOC_SIZESHIFT) & bindings::_IOC_SIZEMASK) as usize
> +    ((nr >> uapi::_IOC_SIZESHIFT) & uapi::_IOC_SIZEMASK) as usize
>  }
>