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

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Message-ID: <20250429044820.2yhrr3xvmy6riwgc@vireshk-i7>
Date: Tue, 29 Apr 2025 10:18:20 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Stephen Rothwell <sfr@...b.auug.org.au>
Cc: 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 cpufreq-arm tree

On 28-04-25, 11:57, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the cpufreq-arm tree, today's linux-next build (x86_64
> allmodconfig) failed like this:
> 
> error[E0308]: mismatched types
>    --> rust/kernel/cpufreq.rs:950:18
>     |
> 950 |             Some(Self::update_limits_callback)
>     |             ---- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected fn pointer, found fn item
>     |             |
>     |             arguments to this enum variant are incorrect
>     |
>     = note: expected fn pointer `unsafe extern "C" fn(*mut bindings::cpufreq_policy)`
>                   found fn item `extern "C" fn(u32) {cpufreq::Registration::<T>::update_limits_callback}`
> help: the type constructed contains `extern "C" fn(u32) {cpufreq::Registration::<T>::update_limits_callback}` due to the type of the argument passed
>    --> rust/kernel/cpufreq.rs:950:13
>     |
> 950 |             Some(Self::update_limits_callback)
>     |             ^^^^^----------------------------^
>     |                  |
>     |                  this argument influences the type of `Some`
> note: tuple variant defined here
>    --> /usr/lib/rustlib/src/rust/library/core/src/option.rs:580:5
>     |
> 580 |     Some(#[stable(feature = "rust1", since = "1.0.0")] T),
>     |     ^^^^
> 
> error: aborting due to 1 previous error
> 
> For more information about this error, try `rustc --explain E0308`.
> 
> Caused by commit
> 
>   c490d1f07bec ("rust: cpufreq: Extend abstractions for driver registration")
> 
> I have used the cpufreq-arm tree from next-20250424 for today.

Fixed and pushed. Thanks. There was a conflict against a recent update
in the PM tree.

-- 
viresh