linux-kernel - Re: [PATCH v2 1/3] mm: unified hmm fault and migrate device pagewalk paths

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Message-ID: <202601200418.y3IajnfX-lkp@intel.com>
Date: Tue, 20 Jan 2026 04:31:26 +0800
From: kernel test robot <lkp@...el.com>
To: mpenttil@...hat.com, linux-mm@...ck.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Mika Penttilä <mpenttil@...hat.com>,
	David Hildenbrand <david@...hat.com>,
	Jason Gunthorpe <jgg@...dia.com>,
	Leon Romanovsky <leonro@...dia.com>,
	Alistair Popple <apopple@...dia.com>,
	Balbir Singh <balbirs@...dia.com>, Zi Yan <ziy@...dia.com>,
	Matthew Brost <matthew.brost@...el.com>
Subject: Re: [PATCH v2 1/3] mm: unified hmm fault and migrate device pagewalk
 paths

Hi,

kernel test robot noticed the following build errors:

[auto build test ERROR on 24d479d26b25bce5faea3ddd9fa8f3a6c3129ea7]

url:    https://github.com/intel-lab-lkp/linux/commits/mpenttil-redhat-com/mm-unified-hmm-fault-and-migrate-device-pagewalk-paths/20260119-193100
base:   24d479d26b25bce5faea3ddd9fa8f3a6c3129ea7
patch link:    https://lore.kernel.org/r/20260119112502.645059-2-mpenttil%40redhat.com
patch subject: [PATCH v2 1/3] mm: unified hmm fault and migrate device pagewalk paths
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20260120/202601200418.y3IajnfX-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260120/202601200418.y3IajnfX-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202601200418.y3IajnfX-lkp@intel.com/

All errors (new ones prefixed by >>):

>> ld.lld: error: undefined symbol: hmm_range_fault
   >>> referenced by migrate_device.c:774 (mm/migrate_device.c:774)
   >>>               vmlinux.o:(migrate_vma_setup)

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki