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

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Message-ID: <20251020133144.5e6e3d03@canb.auug.org.au>
Date: Mon, 20 Oct 2025 13:31:44 +1100
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: Wei Liu <wei.liu@...nel.org>
Cc: Mukesh Rathor <mrathor@...ux.microsoft.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 hyperv tree

Hi all,

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

arch/x86/hyperv/hv_init.c: In function 'hyperv_init':
arch/x86/hyperv/hv_init.c:558:17: error: implicit declaration of function 'hv_root_crash_init' [-Wimplicit-function-declaration]
  558 |                 hv_root_crash_init();
      |                 ^~~~~~~~~~~~~~~~~~

Caused by commit

  60116744be53 ("x86/hyperv: Enable build of hypervisor crashdump collection files")

$ grep CONFIG_MSHV_ROOT .config
$

I have used the hyperv tree from next-20251017 for today.

-- 
Cheers,
Stephen Rothwell

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