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Message-ID: <202601142231.LW22PqTJ-lkp@intel.com>
Date: Wed, 14 Jan 2026 22:57:19 +0800
From: kernel test robot <lkp@...el.com>
To: mpenttil@...hat.com, linux-mm@...ck.org
Cc: 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 1/3] mm: unified hmm fault and migrate device pagewalk
paths
Hi,
kernel test robot noticed the following build warnings:
[auto build test WARNING on akpm-mm/mm-nonmm-unstable]
[also build test WARNING on linus/master v6.19-rc5 next-20260114]
[cannot apply to akpm-mm/mm-everything]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/mpenttil-redhat-com/mm-unified-hmm-fault-and-migrate-device-pagewalk-paths/20260114-172232
base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-nonmm-unstable
patch link: https://lore.kernel.org/r/20260114091923.3950465-2-mpenttil%40redhat.com
patch subject: [PATCH 1/3] mm: unified hmm fault and migrate device pagewalk paths
config: parisc-allyesconfig (https://download.01.org/0day-ci/archive/20260114/202601142231.LW22PqTJ-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260114/202601142231.LW22PqTJ-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/202601142231.LW22PqTJ-lkp@intel.com/
All warnings (new ones prefixed by >>):
mm/hmm.c: In function 'hmm_vma_handle_absent_pmd':
>> mm/hmm.c:423:27: warning: unused variable 'range' [-Wunused-variable]
423 | struct hmm_range *range = hmm_vma_walk->range;
| ^~~~~
vim +/range +423 mm/hmm.c
53f5c3f489ecddc Jérôme Glisse 2018-04-10 369
10b9feee2d0dc81 Francois Dugast 2025-09-08 370 #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
10b9feee2d0dc81 Francois Dugast 2025-09-08 371 static int hmm_vma_handle_absent_pmd(struct mm_walk *walk, unsigned long start,
10b9feee2d0dc81 Francois Dugast 2025-09-08 372 unsigned long end, unsigned long *hmm_pfns,
10b9feee2d0dc81 Francois Dugast 2025-09-08 373 pmd_t pmd)
10b9feee2d0dc81 Francois Dugast 2025-09-08 374 {
10b9feee2d0dc81 Francois Dugast 2025-09-08 375 struct hmm_vma_walk *hmm_vma_walk = walk->private;
10b9feee2d0dc81 Francois Dugast 2025-09-08 376 struct hmm_range *range = hmm_vma_walk->range;
10b9feee2d0dc81 Francois Dugast 2025-09-08 377 unsigned long npages = (end - start) >> PAGE_SHIFT;
0ac881efe164685 Lorenzo Stoakes 2025-11-10 378 const softleaf_t entry = softleaf_from_pmd(pmd);
10b9feee2d0dc81 Francois Dugast 2025-09-08 379 unsigned long addr = start;
10b9feee2d0dc81 Francois Dugast 2025-09-08 380 unsigned int required_fault;
10b9feee2d0dc81 Francois Dugast 2025-09-08 381
0ac881efe164685 Lorenzo Stoakes 2025-11-10 382 if (softleaf_is_device_private(entry) &&
0ac881efe164685 Lorenzo Stoakes 2025-11-10 383 softleaf_to_folio(entry)->pgmap->owner ==
10b9feee2d0dc81 Francois Dugast 2025-09-08 384 range->dev_private_owner) {
10b9feee2d0dc81 Francois Dugast 2025-09-08 385 unsigned long cpu_flags = HMM_PFN_VALID |
10b9feee2d0dc81 Francois Dugast 2025-09-08 386 hmm_pfn_flags_order(PMD_SHIFT - PAGE_SHIFT);
0ac881efe164685 Lorenzo Stoakes 2025-11-10 387 unsigned long pfn = softleaf_to_pfn(entry);
10b9feee2d0dc81 Francois Dugast 2025-09-08 388 unsigned long i;
10b9feee2d0dc81 Francois Dugast 2025-09-08 389
0ac881efe164685 Lorenzo Stoakes 2025-11-10 390 if (softleaf_is_device_private_write(entry))
10b9feee2d0dc81 Francois Dugast 2025-09-08 391 cpu_flags |= HMM_PFN_WRITE;
10b9feee2d0dc81 Francois Dugast 2025-09-08 392
10b9feee2d0dc81 Francois Dugast 2025-09-08 393 /*
10b9feee2d0dc81 Francois Dugast 2025-09-08 394 * Fully populate the PFN list though subsequent PFNs could be
10b9feee2d0dc81 Francois Dugast 2025-09-08 395 * inferred, because drivers which are not yet aware of large
10b9feee2d0dc81 Francois Dugast 2025-09-08 396 * folios probably do not support sparsely populated PFN lists.
10b9feee2d0dc81 Francois Dugast 2025-09-08 397 */
10b9feee2d0dc81 Francois Dugast 2025-09-08 398 for (i = 0; addr < end; addr += PAGE_SIZE, i++, pfn++) {
10b9feee2d0dc81 Francois Dugast 2025-09-08 399 hmm_pfns[i] &= HMM_PFN_INOUT_FLAGS;
10b9feee2d0dc81 Francois Dugast 2025-09-08 400 hmm_pfns[i] |= pfn | cpu_flags;
10b9feee2d0dc81 Francois Dugast 2025-09-08 401 }
10b9feee2d0dc81 Francois Dugast 2025-09-08 402
10b9feee2d0dc81 Francois Dugast 2025-09-08 403 return 0;
10b9feee2d0dc81 Francois Dugast 2025-09-08 404 }
10b9feee2d0dc81 Francois Dugast 2025-09-08 405
10b9feee2d0dc81 Francois Dugast 2025-09-08 406 required_fault = hmm_range_need_fault(hmm_vma_walk, hmm_pfns,
10b9feee2d0dc81 Francois Dugast 2025-09-08 407 npages, 0);
10b9feee2d0dc81 Francois Dugast 2025-09-08 408 if (required_fault) {
0ac881efe164685 Lorenzo Stoakes 2025-11-10 409 if (softleaf_is_device_private(entry))
10b9feee2d0dc81 Francois Dugast 2025-09-08 410 return hmm_vma_fault(addr, end, required_fault, walk);
10b9feee2d0dc81 Francois Dugast 2025-09-08 411 else
10b9feee2d0dc81 Francois Dugast 2025-09-08 412 return -EFAULT;
10b9feee2d0dc81 Francois Dugast 2025-09-08 413 }
10b9feee2d0dc81 Francois Dugast 2025-09-08 414
70d15e6adfafc3e Mika Penttilä 2026-01-14 415 return hmm_pfns_fill(start, end, hmm_vma_walk, HMM_PFN_ERROR);
10b9feee2d0dc81 Francois Dugast 2025-09-08 416 }
10b9feee2d0dc81 Francois Dugast 2025-09-08 417 #else
10b9feee2d0dc81 Francois Dugast 2025-09-08 418 static int hmm_vma_handle_absent_pmd(struct mm_walk *walk, unsigned long start,
10b9feee2d0dc81 Francois Dugast 2025-09-08 419 unsigned long end, unsigned long *hmm_pfns,
10b9feee2d0dc81 Francois Dugast 2025-09-08 420 pmd_t pmd)
10b9feee2d0dc81 Francois Dugast 2025-09-08 421 {
10b9feee2d0dc81 Francois Dugast 2025-09-08 422 struct hmm_vma_walk *hmm_vma_walk = walk->private;
10b9feee2d0dc81 Francois Dugast 2025-09-08 @423 struct hmm_range *range = hmm_vma_walk->range;
10b9feee2d0dc81 Francois Dugast 2025-09-08 424 unsigned long npages = (end - start) >> PAGE_SHIFT;
10b9feee2d0dc81 Francois Dugast 2025-09-08 425
10b9feee2d0dc81 Francois Dugast 2025-09-08 426 if (hmm_range_need_fault(hmm_vma_walk, hmm_pfns, npages, 0))
10b9feee2d0dc81 Francois Dugast 2025-09-08 427 return -EFAULT;
70d15e6adfafc3e Mika Penttilä 2026-01-14 428 return hmm_pfns_fill(start, end, hmm_vma_walk, HMM_PFN_ERROR);
10b9feee2d0dc81 Francois Dugast 2025-09-08 429 }
10b9feee2d0dc81 Francois Dugast 2025-09-08 430 #endif /* CONFIG_ARCH_ENABLE_THP_MIGRATION */
10b9feee2d0dc81 Francois Dugast 2025-09-08 431
--
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https://github.com/intel/lkp-tests/wiki
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