Hi Andrey, I love your patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v4.18-rc2] [cannot apply to next-20180625] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Andrey-Ryabinin/kernel-memremap-kasan-Make-ZONE_DEVICE-with-work-with-KASAN/20180626-023131 config: arm64-allmodconfig (attached as .config) compiler: aarch64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree GCC_VERSION=7.2.0 make.cross ARCH=arm64 All error/warnings (new ones prefixed by >>): In file included from arch/arm64/include/asm/thread_info.h:30:0, from include/linux/thread_info.h:38, from include/asm-generic/preempt.h:5, from ./arch/arm64/include/generated/asm/preempt.h:1, from include/linux/preempt.h:81, from include/linux/spinlock.h:51, from include/linux/mmzone.h:8, from include/linux/bootmem.h:8, from mm/kasan/kasan_init.c:13: mm/kasan/kasan_init.c: In function 'kasan_pmd_table': >> mm/kasan/kasan_init.c:63:14: error: implicit declaration of function 'pud_page_vaddr'; did you mean 'pud_page_paddr'? [-Werror=implicit-function-declaration] return __pa(pud_page_vaddr(pud)) == __pa_symbol(kasan_zero_pmd); ^ arch/arm64/include/asm/memory.h:270:50: note: in definition of macro '__pa' #define __pa(x) __virt_to_phys((unsigned long)(x)) ^ mm/kasan/kasan_init.c: In function 'kasan_pte_table': >> mm/kasan/kasan_init.c:75:14: error: implicit declaration of function 'pmd_page_vaddr'; did you mean 'pmd_page_paddr'? [-Werror=implicit-function-declaration] return __pa(pmd_page_vaddr(pmd)) == __pa_symbol(kasan_zero_pte); ^ arch/arm64/include/asm/memory.h:270:50: note: in definition of macro '__pa' #define __pa(x) __virt_to_phys((unsigned long)(x)) ^ mm/kasan/kasan_init.c: In function 'zero_pmd_populate': mm/kasan/kasan_init.c:122:8: error: implicit declaration of function 'slab_is_available'; did you mean 'si_mem_available'? [-Werror=implicit-function-declaration] if (slab_is_available()) ^~~~~~~~~~~~~~~~~ si_mem_available mm/kasan/kasan_init.c: In function 'kasan_populate_zero_shadow': >> mm/kasan/kasan_init.c:267:9: error: implicit declaration of function 'p4d_alloc_one'; did you mean 'pmd_alloc_one'? [-Werror=implicit-function-declaration] p = p4d_alloc_one(&init_mm, addr); ^~~~~~~~~~~~~ pmd_alloc_one >> mm/kasan/kasan_init.c:267:7: warning: assignment makes pointer from integer without a cast [-Wint-conversion] p = p4d_alloc_one(&init_mm, addr); ^ mm/kasan/kasan_init.c: In function 'kasan_free_pte': >> mm/kasan/kasan_init.c:292:28: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] pte_free_kernel(&init_mm, (pte_t *)pmd_page_vaddr(*pmd)); ^ mm/kasan/kasan_init.c: In function 'kasan_free_pmd': mm/kasan/kasan_init.c:307:21: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] pmd_free(&init_mm, (pmd_t *)pud_page_vaddr(*pud)); ^ cc1: some warnings being treated as errors vim +63 mm/kasan/kasan_init.c > 13 #include <linux/bootmem.h> 14 #include <linux/init.h> 15 #include <linux/kasan.h> 16 #include <linux/kernel.h> 17 #include <linux/memblock.h> 18 #include <linux/mm.h> 19 #include <linux/pfn.h> 20 21 #include <asm/page.h> 22 #include <asm/pgalloc.h> 23 24 #include "kasan.h" 25 26 /* 27 * This page serves two purposes: 28 * - It used as early shadow memory. The entire shadow region populated 29 * with this page, before we will be able to setup normal shadow memory. 30 * - Latter it reused it as zero shadow to cover large ranges of memory 31 * that allowed to access, but not handled by kasan (vmalloc/vmemmap ...). 32 */ 33 unsigned char kasan_zero_page[PAGE_SIZE] __page_aligned_bss; 34 35 #if CONFIG_PGTABLE_LEVELS > 4 36 p4d_t kasan_zero_p4d[MAX_PTRS_PER_P4D] __page_aligned_bss; 37 static inline bool kasan_p4d_table(pgd_t pgd) 38 { 39 return __pa(pgd_page_vaddr(pgd)) == __pa_symbol(kasan_zero_p4d); 40 } 41 #else 42 static inline bool kasan_p4d_table(pgd_t pgd) 43 { 44 return 0; 45 } 46 #endif 47 #if CONFIG_PGTABLE_LEVELS > 3 48 pud_t kasan_zero_pud[PTRS_PER_PUD] __page_aligned_bss; 49 static inline bool kasan_pud_table(p4d_t p4d) 50 { 51 return __pa(p4d_page_vaddr(p4d)) == __pa_symbol(kasan_zero_pud); 52 } 53 #else 54 static inline bool kasan_pud_table(p4d_t p4d) 55 { 56 return 0; 57 } 58 #endif 59 #if CONFIG_PGTABLE_LEVELS > 2 60 pmd_t kasan_zero_pmd[PTRS_PER_PMD] __page_aligned_bss; 61 static inline bool kasan_pmd_table(pud_t pud) 62 { > 63 return __pa(pud_page_vaddr(pud)) == __pa_symbol(kasan_zero_pmd); 64 } 65 #else 66 static inline bool kasan_pmd_table(pud_t pud) 67 { 68 return 0; 69 } 70 #endif 71 pte_t kasan_zero_pte[PTRS_PER_PTE] __page_aligned_bss; 72 73 static inline bool kasan_pte_table(pmd_t pmd) 74 { > 75 return __pa(pmd_page_vaddr(pmd)) == __pa_symbol(kasan_zero_pte); 76 } 77 78 static inline bool kasan_zero_page_entry(pte_t pte) 79 { 80 return pte_pfn(pte) == PHYS_PFN(__pa_symbol(kasan_zero_page)); 81 } 82 83 static __init void *early_alloc(size_t size, int node) 84 { 85 return memblock_virt_alloc_try_nid(size, size, __pa(MAX_DMA_ADDRESS), 86 BOOTMEM_ALLOC_ACCESSIBLE, node); 87 } 88 89 static void __ref zero_pte_populate(pmd_t *pmd, unsigned long addr, 90 unsigned long end) 91 { 92 pte_t *pte = pte_offset_kernel(pmd, addr); 93 pte_t zero_pte; 94 95 zero_pte = pfn_pte(PFN_DOWN(__pa_symbol(kasan_zero_page)), PAGE_KERNEL); 96 zero_pte = pte_wrprotect(zero_pte); 97 98 while (addr + PAGE_SIZE <= end) { 99 set_pte_at(&init_mm, addr, pte, zero_pte); 100 addr += PAGE_SIZE; 101 pte = pte_offset_kernel(pmd, addr); 102 } 103 } 104 105 static int __ref zero_pmd_populate(pud_t *pud, unsigned long addr, 106 unsigned long end) 107 { 108 pmd_t *pmd = pmd_offset(pud, addr); 109 unsigned long next; 110 111 do { 112 next = pmd_addr_end(addr, end); 113 114 if (IS_ALIGNED(addr, PMD_SIZE) && end - addr >= PMD_SIZE) { 115 pmd_populate_kernel(&init_mm, pmd, lm_alias(kasan_zero_pte)); 116 continue; 117 } 118 119 if (pmd_none(*pmd)) { 120 pte_t *p; 121 > 122 if (slab_is_available()) 123 p = pte_alloc_one_kernel(&init_mm, addr); 124 else 125 p = early_alloc(PAGE_SIZE, NUMA_NO_NODE); 126 if (!p) 127 return -ENOMEM; 128 129 pmd_populate_kernel(&init_mm, pmd, p); 130 } 131 zero_pte_populate(pmd, addr, next); 132 } while (pmd++, addr = next, addr != end); 133 134 return 0; 135 } 136 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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