linux-kernel - Re: linux-next: build failure after merge of the workqueues tree

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Message-ID: <CAJ-ks9kUBCX6PjOeOSVQNXYGcy9gkYw++BEmHZ0eFbsyZeBZcQ@mail.gmail.com>
Date: Tue, 15 Apr 2025 09:24:32 -0400
From: Tamir Duberstein <tamird@...il.com>
To: Stephen Rothwell <sfr@...b.auug.org.au>
Cc: Tejun Heo <tj@...nel.org>, Benno Lossin <benno.lossin@...ton.me>, 
	Alice Ryhl <aliceryhl@...gle.com>, Andreas Hindborg <a.hindborg@...nel.org>, 
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, 
	Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the workqueues tree

On Tue, Apr 15, 2025 at 12:01 AM Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> Hi all,
>
> After merging the workqueues tree, today's linux-next build (x86_64
> allmodconfig) failed like this:
>
> error[E0308]: mismatched types
>    --> rust/kernel/lib.rs:204:9
>     |
> 204 |           ptr.sub(offset) as *const $type
>     |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ types differ in mutability
>     |
>    ::: rust/kernel/workqueue.rs:495:18
>     |
> 495 |               ) -> *mut Self {
>     |                    --------- expected `*mut ClosureWork<T>` because of return type
> ...
> 505 | / impl_has_work! {
> 506 | |     impl{T} HasWork<Self> for ClosureWork<T> { self.work }
> 507 | | }
>     | |_- in this macro invocation
>     |
>     = note: expected raw pointer `*mut ClosureWork<T>`
>                found raw pointer `*const ClosureWork<T>`
>     = note: this error originates in the macro `$crate::container_of` which comes from the expansion of the macro `impl_has_work` (in Nightly builds, run with -Z macro-backtrace for more info)
>
> error: aborting due to 1 previous error
>
> For more information about this error, try `rustc --explain E0308`.
>
> Caused by commit
>
>   345e029b561e ("rust: workqueue: remove HasWork::OFFSET")
>
> I have used the workqueues tree from next-20250414 for today.

HI Stephen, I believe Tejun plans to back this out. See
https://lore.kernel.org/all/CAJ-ks9k2FEfL4SWw3ThhhozAeHB=Ue9-_1pxb9XVPRR2E1Z+SQ@mail.gmail.com/.