linux-kernel - Re: linux-next: manual merge of the rust tree with the char-misc tree

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Message-ID: <20241128124804.36680f92@canb.auug.org.au>
Date: Thu, 28 Nov 2024 12:48:04 +1100
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: Greg KH <greg@...ah.com>, Arnd Bergmann <arnd@...db.de>
Cc: Miguel Ojeda <ojeda@...nel.org>, Danilo Krummrich <dakr@...nel.org>,
 Gary Guo <gary@...yguo.net>, Greg Kroah-Hartman
 <gregkh@...uxfoundation.org>, Linux Kernel Mailing List
 <linux-kernel@...r.kernel.org>, Linux Next Mailing List
 <linux-next@...r.kernel.org>, Wedson Almeida Filho <walmeida@...rosoft.com>
Subject: Re: linux-next: manual merge of the rust tree with the char-misc
 tree

Hi all,

On Mon, 11 Nov 2024 17:34:59 +1100 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> Today's linux-next merge of the rust tree got a conflict in:
> 
>   rust/macros/module.rs
> 
> between commit:
> 
>   7f15c46a57c3 ("rust: introduce `InPlaceModule`")
> 
> from the char-misc tree and commit:
> 
>   d072acda4862 ("rust: use custom FFI integer types")
> 
> 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.
> 
> diff --cc rust/macros/module.rs
> index a03266a78cfb,e7a087b7e884..000000000000
> --- a/rust/macros/module.rs
> +++ b/rust/macros/module.rs
> @@@ -332,15 -330,21 +332,15 @@@ pub(crate) fn module(ts: TokenStream) -
>                       /// # Safety
>                       ///
>                       /// This function must only be called once.
> -                     unsafe fn __init() -> core::ffi::c_int {{
> +                     unsafe fn __init() -> kernel::ffi::c_int {{
>  -                        match <{type_} as kernel::Module>::init(&super::super::THIS_MODULE) {{
>  -                            Ok(m) => {{
>  -                                // SAFETY: No data race, since `__MOD` can only be accessed by this
>  -                                // module and there only `__init` and `__exit` access it. These
>  -                                // functions are only called once and `__exit` cannot be called
>  -                                // before or during `__init`.
>  -                                unsafe {{
>  -                                    __MOD = Some(m);
>  -                                }}
>  -                                return 0;
>  -                            }}
>  -                            Err(e) => {{
>  -                                return e.to_errno();
>  -                            }}
>  +                        let initer =
>  +                            <{type_} as kernel::InPlaceModule>::init(&super::super::THIS_MODULE);
>  +                        // SAFETY: No data race, since `__MOD` can only be accessed by this module
>  +                        // and there only `__init` and `__exit` access it. These functions are only
>  +                        // called once and `__exit` cannot be called before or during `__init`.
>  +                        match unsafe {{ initer.__pinned_init(__MOD.as_mut_ptr()) }} {{
>  +                            Ok(m) => 0,
>  +                            Err(e) => e.to_errno(),
>                           }}
>                       }}
>   

This is now  conflict between the char-misc tree and Linus' tree.

-- 
Cheers,
Stephen Rothwell

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