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Mon, 19 Jan 2026 22:29:58 -0800 (PST) Date: Tue, 20 Jan 2026 09:29:55 +0300 From: Dan Carpenter To: oe-kbuild@lists.linux.dev, mpenttil@redhat.com, linux-mm@kvack.org Cc: lkp@intel.com, oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org, Mika =?iso-8859-1?Q?Penttil=E4?= , David Hildenbrand , Jason Gunthorpe , Leon Romanovsky , Alistair Popple , Balbir Singh , Zi Yan , Matthew Brost Subject: Re: [PATCH v2 1/3] mm: unified hmm fault and migrate device pagewalk paths Message-ID: <202601200251.uRdWeQPq-lkp@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20260119112502.645059-2-mpenttil@redhat.com> Hi, kernel test robot noticed the following build warnings: 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: sparc-randconfig-r071-20260119 (https://download.01.org/0day-ci/archive/20260120/202601200251.uRdWeQPq-lkp@intel.com/config) compiler: sparc-linux-gcc (GCC) 15.2.0 smatch version: v0.5.0-8985-g2614ff1a 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 | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202601200251.uRdWeQPq-lkp@intel.com/ smatch warnings: mm/hmm.c:960 hmm_vma_walk_pmd() warn: missing error code? 'r' mm/hmm.c:1310 hmm_range_fault() error: we previously assumed 'range->notifier' could be null (see line 1296) vim +/r +960 mm/hmm.c 53f5c3f489ecdd Jérôme Glisse 2018-04-10 926 static int hmm_vma_walk_pmd(pmd_t *pmdp, 53f5c3f489ecdd Jérôme Glisse 2018-04-10 927 unsigned long start, 53f5c3f489ecdd Jérôme Glisse 2018-04-10 928 unsigned long end, 53f5c3f489ecdd Jérôme Glisse 2018-04-10 929 struct mm_walk *walk) 53f5c3f489ecdd Jérôme Glisse 2018-04-10 930 { 53f5c3f489ecdd Jérôme Glisse 2018-04-10 931 struct hmm_vma_walk *hmm_vma_walk = walk->private; 53f5c3f489ecdd Jérôme Glisse 2018-04-10 932 struct hmm_range *range = hmm_vma_walk->range; 2733ea144dcce7 Jason Gunthorpe 2020-05-01 933 unsigned long *hmm_pfns = 2733ea144dcce7 Jason Gunthorpe 2020-05-01 934 &range->hmm_pfns[(start - range->start) >> PAGE_SHIFT]; 2288a9a68175ce Jason Gunthorpe 2020-03-05 935 unsigned long npages = (end - start) >> PAGE_SHIFT; adc5de78797562 Mika Penttilä 2026-01-19 936 struct mm_struct *mm = walk->vma->vm_mm; 2288a9a68175ce Jason Gunthorpe 2020-03-05 937 unsigned long addr = start; adc5de78797562 Mika Penttilä 2026-01-19 938 enum migrate_vma_info minfo; adc5de78797562 Mika Penttilä 2026-01-19 939 unsigned long i; adc5de78797562 Mika Penttilä 2026-01-19 940 spinlock_t *ptl; 53f5c3f489ecdd Jérôme Glisse 2018-04-10 941 pte_t *ptep; d08faca018c461 Jérôme Glisse 2018-10-30 942 pmd_t pmd; adc5de78797562 Mika Penttilä 2026-01-19 943 int r; adc5de78797562 Mika Penttilä 2026-01-19 944 adc5de78797562 Mika Penttilä 2026-01-19 945 minfo = hmm_select_migrate(range); 53f5c3f489ecdd Jérôme Glisse 2018-04-10 946 53f5c3f489ecdd Jérôme Glisse 2018-04-10 947 again: adc5de78797562 Mika Penttilä 2026-01-19 948 hmm_vma_walk->locked = false; adc5de78797562 Mika Penttilä 2026-01-19 949 hmm_vma_walk->pmdlocked = false; 26e1a0c3277d7f Hugh Dickins 2023-06-08 950 pmd = pmdp_get_lockless(pmdp); adc5de78797562 Mika Penttilä 2026-01-19 951 if (pmd_none(pmd)) { adc5de78797562 Mika Penttilä 2026-01-19 952 r = hmm_vma_walk_hole(start, end, -1, walk); adc5de78797562 Mika Penttilä 2026-01-19 953 if (r || !minfo) adc5de78797562 Mika Penttilä 2026-01-19 954 return r; if minfo is NULL do we return success? adc5de78797562 Mika Penttilä 2026-01-19 955 adc5de78797562 Mika Penttilä 2026-01-19 956 ptl = pmd_lock(walk->mm, pmdp); adc5de78797562 Mika Penttilä 2026-01-19 957 if (pmd_none(*pmdp)) { adc5de78797562 Mika Penttilä 2026-01-19 958 // hmm_vma_walk_hole() filled migration needs adc5de78797562 Mika Penttilä 2026-01-19 959 spin_unlock(ptl); adc5de78797562 Mika Penttilä 2026-01-19 @960 return r; And here? adc5de78797562 Mika Penttilä 2026-01-19 961 } adc5de78797562 Mika Penttilä 2026-01-19 962 spin_unlock(ptl); adc5de78797562 Mika Penttilä 2026-01-19 963 } 53f5c3f489ecdd Jérôme Glisse 2018-04-10 964 0ac881efe16468 Lorenzo Stoakes 2025-11-10 965 if (thp_migration_supported() && pmd_is_migration_entry(pmd)) { adc5de78797562 Mika Penttilä 2026-01-19 966 if (!minfo) { 2733ea144dcce7 Jason Gunthorpe 2020-05-01 967 if (hmm_range_need_fault(hmm_vma_walk, hmm_pfns, npages, 0)) { d08faca018c461 Jérôme Glisse 2018-10-30 968 hmm_vma_walk->last = addr; d2e8d551165ccb Ralph Campbell 2019-07-25 969 pmd_migration_entry_wait(walk->mm, pmdp); 73231612dc7c90 Jérôme Glisse 2019-05-13 970 return -EBUSY; d08faca018c461 Jérôme Glisse 2018-10-30 971 } 2288a9a68175ce Jason Gunthorpe 2020-03-05 972 } adc5de78797562 Mika Penttilä 2026-01-19 973 for (i = 0; addr < end; addr += PAGE_SIZE, i++) adc5de78797562 Mika Penttilä 2026-01-19 974 hmm_pfns[i] &= HMM_PFN_INOUT_FLAGS; 2288a9a68175ce Jason Gunthorpe 2020-03-05 975 adc5de78797562 Mika Penttilä 2026-01-19 976 return 0; adc5de78797562 Mika Penttilä 2026-01-19 977 } adc5de78797562 Mika Penttilä 2026-01-19 978 adc5de78797562 Mika Penttilä 2026-01-19 979 if (minfo) { adc5de78797562 Mika Penttilä 2026-01-19 980 hmm_vma_walk->ptl = pmd_lock(mm, pmdp); adc5de78797562 Mika Penttilä 2026-01-19 981 hmm_vma_walk->pmdlocked = true; adc5de78797562 Mika Penttilä 2026-01-19 982 pmd = pmdp_get(pmdp); adc5de78797562 Mika Penttilä 2026-01-19 983 } else adc5de78797562 Mika Penttilä 2026-01-19 984 pmd = pmdp_get_lockless(pmdp); adc5de78797562 Mika Penttilä 2026-01-19 985 adc5de78797562 Mika Penttilä 2026-01-19 986 if (pmd_trans_huge(pmd) || !pmd_present(pmd)) { adc5de78797562 Mika Penttilä 2026-01-19 987 adc5de78797562 Mika Penttilä 2026-01-19 988 if (!pmd_present(pmd)) { adc5de78797562 Mika Penttilä 2026-01-19 989 r = hmm_vma_handle_absent_pmd(walk, start, end, hmm_pfns, 10b9feee2d0dc8 Francois Dugast 2025-09-08 990 pmd); adc5de78797562 Mika Penttilä 2026-01-19 991 if (r || !minfo) adc5de78797562 Mika Penttilä 2026-01-19 992 return r; Same adc5de78797562 Mika Penttilä 2026-01-19 993 } else { d08faca018c461 Jérôme Glisse 2018-10-30 994 53f5c3f489ecdd Jérôme Glisse 2018-04-10 995 /* adc5de78797562 Mika Penttilä 2026-01-19 996 * No need to take pmd_lock here if not migrating, adc5de78797562 Mika Penttilä 2026-01-19 997 * even if some other thread is splitting the huge adc5de78797562 Mika Penttilä 2026-01-19 998 * pmd we will get that event through mmu_notifier callback. 53f5c3f489ecdd Jérôme Glisse 2018-04-10 999 * d2e8d551165ccb Ralph Campbell 2019-07-25 1000 * So just read pmd value and check again it's a transparent 53f5c3f489ecdd Jérôme Glisse 2018-04-10 1001 * huge or device mapping one and compute corresponding pfn 53f5c3f489ecdd Jérôme Glisse 2018-04-10 1002 * values. 53f5c3f489ecdd Jérôme Glisse 2018-04-10 1003 */ adc5de78797562 Mika Penttilä 2026-01-19 1004 adc5de78797562 Mika Penttilä 2026-01-19 1005 if (!pmd_trans_huge(pmd)) { adc5de78797562 Mika Penttilä 2026-01-19 1006 // must be lockless 53f5c3f489ecdd Jérôme Glisse 2018-04-10 1007 goto again; adc5de78797562 Mika Penttilä 2026-01-19 1008 } adc5de78797562 Mika Penttilä 2026-01-19 1009 adc5de78797562 Mika Penttilä 2026-01-19 1010 r = hmm_vma_handle_pmd(walk, addr, end, hmm_pfns, pmd); adc5de78797562 Mika Penttilä 2026-01-19 1011 adc5de78797562 Mika Penttilä 2026-01-19 1012 if (r || !minfo) adc5de78797562 Mika Penttilä 2026-01-19 1013 return r; Same? adc5de78797562 Mika Penttilä 2026-01-19 1014 } adc5de78797562 Mika Penttilä 2026-01-19 1015 adc5de78797562 Mika Penttilä 2026-01-19 1016 r = hmm_vma_handle_migrate_prepare_pmd(walk, pmdp, start, end, hmm_pfns); adc5de78797562 Mika Penttilä 2026-01-19 1017 adc5de78797562 Mika Penttilä 2026-01-19 1018 if (hmm_vma_walk->pmdlocked) { adc5de78797562 Mika Penttilä 2026-01-19 1019 spin_unlock(hmm_vma_walk->ptl); adc5de78797562 Mika Penttilä 2026-01-19 1020 hmm_vma_walk->pmdlocked = false; adc5de78797562 Mika Penttilä 2026-01-19 1021 } adc5de78797562 Mika Penttilä 2026-01-19 1022 adc5de78797562 Mika Penttilä 2026-01-19 1023 if (r == -ENOENT) { adc5de78797562 Mika Penttilä 2026-01-19 1024 r = hmm_vma_walk_split(pmdp, addr, walk); adc5de78797562 Mika Penttilä 2026-01-19 1025 if (r) { adc5de78797562 Mika Penttilä 2026-01-19 1026 /* Split not successful, skip */ adc5de78797562 Mika Penttilä 2026-01-19 1027 return hmm_pfns_fill(start, end, hmm_vma_walk, HMM_PFN_ERROR); adc5de78797562 Mika Penttilä 2026-01-19 1028 } adc5de78797562 Mika Penttilä 2026-01-19 1029 adc5de78797562 Mika Penttilä 2026-01-19 1030 /* Split successful or "again", reloop */ adc5de78797562 Mika Penttilä 2026-01-19 1031 hmm_vma_walk->last = addr; adc5de78797562 Mika Penttilä 2026-01-19 1032 return -EBUSY; adc5de78797562 Mika Penttilä 2026-01-19 1033 } adc5de78797562 Mika Penttilä 2026-01-19 1034 adc5de78797562 Mika Penttilä 2026-01-19 1035 return r; 53f5c3f489ecdd Jérôme Glisse 2018-04-10 1036 adc5de78797562 Mika Penttilä 2026-01-19 1037 } adc5de78797562 Mika Penttilä 2026-01-19 1038 adc5de78797562 Mika Penttilä 2026-01-19 1039 if (hmm_vma_walk->pmdlocked) { adc5de78797562 Mika Penttilä 2026-01-19 1040 spin_unlock(hmm_vma_walk->ptl); adc5de78797562 Mika Penttilä 2026-01-19 1041 hmm_vma_walk->pmdlocked = false; 53f5c3f489ecdd Jérôme Glisse 2018-04-10 1042 } 53f5c3f489ecdd Jérôme Glisse 2018-04-10 1043 d08faca018c461 Jérôme Glisse 2018-10-30 1044 /* d2e8d551165ccb Ralph Campbell 2019-07-25 1045 * We have handled all the valid cases above ie either none, migration, d08faca018c461 Jérôme Glisse 2018-10-30 1046 * huge or transparent huge. At this point either it is a valid pmd d08faca018c461 Jérôme Glisse 2018-10-30 1047 * entry pointing to pte directory or it is a bad pmd that will not d08faca018c461 Jérôme Glisse 2018-10-30 1048 * recover. d08faca018c461 Jérôme Glisse 2018-10-30 1049 */ 2288a9a68175ce Jason Gunthorpe 2020-03-05 1050 if (pmd_bad(pmd)) { 2733ea144dcce7 Jason Gunthorpe 2020-05-01 1051 if (hmm_range_need_fault(hmm_vma_walk, hmm_pfns, npages, 0)) 2288a9a68175ce Jason Gunthorpe 2020-03-05 1052 return -EFAULT; adc5de78797562 Mika Penttilä 2026-01-19 1053 return hmm_pfns_fill(start, end, hmm_vma_walk, HMM_PFN_ERROR); 2288a9a68175ce Jason Gunthorpe 2020-03-05 1054 } 53f5c3f489ecdd Jérôme Glisse 2018-04-10 1055 adc5de78797562 Mika Penttilä 2026-01-19 1056 if (minfo) { adc5de78797562 Mika Penttilä 2026-01-19 1057 ptep = pte_offset_map_lock(mm, pmdp, addr, &hmm_vma_walk->ptl); adc5de78797562 Mika Penttilä 2026-01-19 1058 if (ptep) adc5de78797562 Mika Penttilä 2026-01-19 1059 hmm_vma_walk->locked = true; adc5de78797562 Mika Penttilä 2026-01-19 1060 } else 53f5c3f489ecdd Jérôme Glisse 2018-04-10 1061 ptep = pte_offset_map(pmdp, addr); 6ec1905f6ec7f9 Hugh Dickins 2023-06-08 1062 if (!ptep) 6ec1905f6ec7f9 Hugh Dickins 2023-06-08 1063 goto again; adc5de78797562 Mika Penttilä 2026-01-19 1064 2733ea144dcce7 Jason Gunthorpe 2020-05-01 1065 for (; addr < end; addr += PAGE_SIZE, ptep++, hmm_pfns++) { 53f5c3f489ecdd Jérôme Glisse 2018-04-10 1066 2733ea144dcce7 Jason Gunthorpe 2020-05-01 1067 r = hmm_vma_handle_pte(walk, addr, end, pmdp, ptep, hmm_pfns); 53f5c3f489ecdd Jérôme Glisse 2018-04-10 1068 if (r) { dfdc22078f3f06 Jason Gunthorpe 2020-02-28 1069 /* hmm_vma_handle_pte() did pte_unmap() */ 53f5c3f489ecdd Jérôme Glisse 2018-04-10 1070 return r; 53f5c3f489ecdd Jérôme Glisse 2018-04-10 1071 } adc5de78797562 Mika Penttilä 2026-01-19 1072 adc5de78797562 Mika Penttilä 2026-01-19 1073 r = hmm_vma_handle_migrate_prepare(walk, pmdp, ptep, addr, hmm_pfns); adc5de78797562 Mika Penttilä 2026-01-19 1074 if (r == -EAGAIN) { adc5de78797562 Mika Penttilä 2026-01-19 1075 goto again; adc5de78797562 Mika Penttilä 2026-01-19 1076 } adc5de78797562 Mika Penttilä 2026-01-19 1077 if (r) { adc5de78797562 Mika Penttilä 2026-01-19 1078 hmm_pfns_fill(addr, end, hmm_vma_walk, HMM_PFN_ERROR); adc5de78797562 Mika Penttilä 2026-01-19 1079 break; da4c3c735ea4dc Jérôme Glisse 2017-09-08 1080 } adc5de78797562 Mika Penttilä 2026-01-19 1081 } adc5de78797562 Mika Penttilä 2026-01-19 1082 adc5de78797562 Mika Penttilä 2026-01-19 1083 if (hmm_vma_walk->locked) adc5de78797562 Mika Penttilä 2026-01-19 1084 pte_unmap_unlock(ptep - 1, hmm_vma_walk->ptl); adc5de78797562 Mika Penttilä 2026-01-19 1085 else da4c3c735ea4dc Jérôme Glisse 2017-09-08 1086 pte_unmap(ptep - 1); adc5de78797562 Mika Penttilä 2026-01-19 1087 da4c3c735ea4dc Jérôme Glisse 2017-09-08 1088 return 0; da4c3c735ea4dc Jérôme Glisse 2017-09-08 1089 } -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki