tree: https://github.com/rgushchin/linux.git kmem_reparent.4 head: 595d92aaebb6a603b2820ce7188b6db971693d85 commit: c7b45943bdf12b5ccfcd016538c62aa7edd604d5 [170/380] mm/mprotect.c: fix compilation warning because of unused 'mm' varaible config: i386-randconfig-x070-201919 (attached as .config) compiler: gcc-7 (Debian 7.3.0-1) 7.3.0 reproduce: git checkout c7b45943bdf12b5ccfcd016538c62aa7edd604d5 # save the attached .config to linux build tree make ARCH=i386 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> Note: the rgushchin/kmem_reparent.4 HEAD 595d92aaebb6a603b2820ce7188b6db971693d85 builds fine. It only hurts bisectibility. All errors (new ones prefixed by >>): In file included from include/linux/mm.h:99:0, from mm/mprotect.c:12: mm/mprotect.c: In function 'change_pte_range': >> mm/mprotect.c:138:19: error: 'struct vm_area_struct' has no member named 'mm' set_pte_at(vma->mm, addr, pte, newpte); ^ arch/x86/include/asm/pgtable.h:64:59: note: in definition of macro 'set_pte_at' #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte) ^~ >> mm/mprotect.c:152:16: error: 'mm' undeclared (first use in this function); did you mean 'hmm'? set_pte_at(mm, addr, pte, newpte); ^ arch/x86/include/asm/pgtable.h:64:59: note: in definition of macro 'set_pte_at' #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte) ^~ mm/mprotect.c:152:16: note: each undeclared identifier is reported only once for each function it appears in set_pte_at(mm, addr, pte, newpte); ^ arch/x86/include/asm/pgtable.h:64:59: note: in definition of macro 'set_pte_at' #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte) ^~ vim +138 mm/mprotect.c > 12 #include <linux/mm.h> 13 #include <linux/hugetlb.h> 14 #include <linux/shm.h> 15 #include <linux/mman.h> 16 #include <linux/fs.h> 17 #include <linux/highmem.h> 18 #include <linux/security.h> 19 #include <linux/mempolicy.h> 20 #include <linux/personality.h> 21 #include <linux/syscalls.h> 22 #include <linux/swap.h> 23 #include <linux/swapops.h> 24 #include <linux/mmu_notifier.h> 25 #include <linux/migrate.h> 26 #include <linux/perf_event.h> 27 #include <linux/pkeys.h> 28 #include <linux/ksm.h> 29 #include <linux/uaccess.h> 30 #include <linux/mm_inline.h> 31 #include <asm/pgtable.h> 32 #include <asm/cacheflush.h> 33 #include <asm/mmu_context.h> 34 #include <asm/tlbflush.h> 35 36 #include "internal.h" 37 38 static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd, 39 unsigned long addr, unsigned long end, pgprot_t newprot, 40 int dirty_accountable, int prot_numa) 41 { 42 pte_t *pte, oldpte; 43 spinlock_t *ptl; 44 unsigned long pages = 0; 45 int target_node = NUMA_NO_NODE; 46 47 /* 48 * Can be called with only the mmap_sem for reading by 49 * prot_numa so we must check the pmd isn't constantly 50 * changing from under us from pmd_none to pmd_trans_huge 51 * and/or the other way around. 52 */ 53 if (pmd_trans_unstable(pmd)) 54 return 0; 55 56 /* 57 * The pmd points to a regular pte so the pmd can't change 58 * from under us even if the mmap_sem is only hold for 59 * reading. 60 */ 61 pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); 62 63 /* Get target node for single threaded private VMAs */ 64 if (prot_numa && !(vma->vm_flags & VM_SHARED) && 65 atomic_read(&vma->vm_mm->mm_users) == 1) 66 target_node = numa_node_id(); 67 68 flush_tlb_batched_pending(vma->vm_mm); 69 arch_enter_lazy_mmu_mode(); 70 do { 71 oldpte = *pte; 72 if (pte_present(oldpte)) { 73 pte_t ptent; 74 bool preserve_write = prot_numa && pte_write(oldpte); 75 76 /* 77 * Avoid trapping faults against the zero or KSM 78 * pages. See similar comment in change_huge_pmd. 79 */ 80 if (prot_numa) { 81 struct page *page; 82 83 page = vm_normal_page(vma, addr, oldpte); 84 if (!page || PageKsm(page)) 85 continue; 86 87 /* Also skip shared copy-on-write pages */ 88 if (is_cow_mapping(vma->vm_flags) && 89 page_mapcount(page) != 1) 90 continue; 91 92 /* 93 * While migration can move some dirty pages, 94 * it cannot move them all from MIGRATE_ASYNC 95 * context. 96 */ 97 if (page_is_file_cache(page) && PageDirty(page)) 98 continue; 99 100 /* Avoid TLB flush if possible */ 101 if (pte_protnone(oldpte)) 102 continue; 103 104 /* 105 * Don't mess with PTEs if page is already on the node 106 * a single-threaded process is running on. 107 */ 108 if (target_node == page_to_nid(page)) 109 continue; 110 } 111 112 oldpte = ptep_modify_prot_start(vma, addr, pte); 113 ptent = pte_modify(oldpte, newprot); 114 if (preserve_write) 115 ptent = pte_mk_savedwrite(ptent); 116 117 /* Avoid taking write faults for known dirty pages */ 118 if (dirty_accountable && pte_dirty(ptent) && 119 (pte_soft_dirty(ptent) || 120 !(vma->vm_flags & VM_SOFTDIRTY))) { 121 ptent = pte_mkwrite(ptent); 122 } 123 ptep_modify_prot_commit(vma, addr, pte, oldpte, ptent); 124 pages++; 125 } else if (IS_ENABLED(CONFIG_MIGRATION)) { 126 swp_entry_t entry = pte_to_swp_entry(oldpte); 127 128 if (is_write_migration_entry(entry)) { 129 pte_t newpte; 130 /* 131 * A protection check is difficult so 132 * just be safe and disable write 133 */ 134 make_migration_entry_read(&entry); 135 newpte = swp_entry_to_pte(entry); 136 if (pte_swp_soft_dirty(oldpte)) 137 newpte = pte_swp_mksoft_dirty(newpte); > 138 set_pte_at(vma->mm, addr, pte, newpte); 139 140 pages++; 141 } 142 143 if (is_write_device_private_entry(entry)) { 144 pte_t newpte; 145 146 /* 147 * We do not preserve soft-dirtiness. See 148 * copy_one_pte() for explanation. 149 */ 150 make_device_private_entry_read(&entry); 151 newpte = swp_entry_to_pte(entry); > 152 set_pte_at(mm, addr, pte, newpte); 153 154 pages++; 155 } 156 } 157 } while (pte++, addr += PAGE_SIZE, addr != end); 158 arch_leave_lazy_mmu_mode(); 159 pte_unmap_unlock(pte - 1, ptl); 160 161 return pages; 162 } 163 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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