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

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Message-Id: <DE2CCUSZV2AF.161T2XNFY72VI@kernel.org>
Date: Fri, 07 Nov 2025 10:05:48 +0100
From: "Danilo Krummrich" <dakr@...nel.org>
To: "Stephen Rothwell" <sfr@...b.auug.org.au>
Cc: "Greg KH" <greg@...ah.com>, "Rafael J. Wysocki" <rafael@...nel.org>,
 "Ingo Molnar" <mingo@...hat.com>, "Peter Zijlstra" <peterz@...radead.org>,
 "Will Deacon" <will@...nel.org>, "Boqun Feng" <boqun.feng@...il.com>,
 "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 driver-core tree

On Fri Nov 7, 2025 at 3:41 AM CET, Stephen Rothwell wrote:
> Caused by commit
>
>   a9fca8a7b2c5 ("rust: debugfs: support blobs from smart pointers")
>
> (maybe interacting with some other change).

This is a conflict with commit da123f0ee40f ("rust: lock: guard: Add T: Unpin
bound to DerefMut") from the tip tree.

The following diff [1] should fix the problem; I will also add a patch in the
driver-core tree for this, since this also works without the above commit.

diff --git a/rust/kernel/debugfs/traits.rs b/rust/kernel/debugfs/traits.rs
index 6bd21ff0ed90..7266c39188ba 100644
--- a/rust/kernel/debugfs/traits.rs
+++ b/rust/kernel/debugfs/traits.rs
@@ -257,7 +257,7 @@ fn read_from_slice(
 }

 // Delegate for `Mutex<T>`: Support a `T` with an outer `Mutex`.
-impl<T: BinaryReaderMut> BinaryReader for Mutex<T> {
+impl<T: BinaryReaderMut + Unpin> BinaryReader for Mutex<T> {
     fn read_from_slice(
         &self,
         reader: &mut UserSliceReader,