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

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Message-ID: <20251022114644.4437c2d9@canb.auug.org.au>
Date: Wed, 22 Oct 2025 11:46:44 +1100
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...nel.org>,
 "H. Peter Anvin" <hpa@...or.com>, Peter Zijlstra <peterz@...radead.org>
Cc: Boqun Feng <boqun.feng@...il.com>, Daniel Almeida
 <daniel.almeida@...labora.com>, Linux Kernel Mailing List
 <linux-kernel@...r.kernel.org>, Linux Next Mailing List
 <linux-next@...r.kernel.org>
Subject: linux-next: build failure after merge of the tip tree

Hi all,

After merging the tip tree, today's linux-next build (x86_64 allmodconfig)
failed like this:

error[E0594]: cannot assign to data in dereference of `lock::Guard<'_, T, MutexBackend>`
  --> rust/kernel/debugfs/traits.rs:64:9
   |
64 |         *self.lock() = val;
   |         ^^^^^^^^^^^^ cannot assign
   |
   = help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `lock::Guard<'_, T, MutexBackend>`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0594`.

Caused by commit

  da123f0ee40f ("rust: lock: guard: Add T: Unpin bound to DerefMut")

I have used the tip tree from next-20251021 for today.

-- 
Cheers,
Stephen Rothwell

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