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SubjectRe: [PATCH -next 3/3] kasan: arm64: Fix pcpu_page_first_chunk crash with KASAN_VMALLOC
Hi Kefeng,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on next-20210701]

url: https://github.com/0day-ci/linux/commits/Kefeng-Wang/arm64-support-page-mapping-percpu-first-chunk-allocator/20210705-190907
base: fb0ca446157a86b75502c1636b0d81e642fe6bf1
config: i386-randconfig-a015-20210705 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
# https://github.com/0day-ci/linux/commit/5f6b5a402ed3e390563ddbddf12973470fd4886d
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Kefeng-Wang/arm64-support-page-mapping-percpu-first-chunk-allocator/20210705-190907
git checkout 5f6b5a402ed3e390563ddbddf12973470fd4886d
# save the attached .config to linux build tree
make W=1 ARCH=i386

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

mm/vmalloc.c: In function 'vm_area_register_early':
>> mm/vmalloc.c:2252:2: error: implicit declaration of function 'kasan_populate_early_vm_area_shadow' [-Werror=implicit-function-declaration]
2252 | kasan_populate_early_vm_area_shadow(vm->addr, vm->size);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors


vim +/kasan_populate_early_vm_area_shadow +2252 mm/vmalloc.c

2226
2227 /**
2228 * vm_area_register_early - register vmap area early during boot
2229 * @vm: vm_struct to register
2230 * @align: requested alignment
2231 *
2232 * This function is used to register kernel vm area before
2233 * vmalloc_init() is called. @vm->size and @vm->flags should contain
2234 * proper values on entry and other fields should be zero. On return,
2235 * vm->addr contains the allocated address.
2236 *
2237 * DO NOT USE THIS FUNCTION UNLESS YOU KNOW WHAT YOU'RE DOING.
2238 */
2239 void __init vm_area_register_early(struct vm_struct *vm, size_t align)
2240 {
2241 unsigned long vm_start = VMALLOC_START;
2242 struct vm_struct *tmp;
2243 unsigned long addr;
2244
2245 for (tmp = vmlist; tmp; tmp = tmp->next)
2246 vm_start = (unsigned long)tmp->addr + tmp->size;
2247
2248 addr = ALIGN(vm_start, align);
2249 vm->addr = (void *)addr;
2250
2251 vm_area_add_early(vm);
> 2252 kasan_populate_early_vm_area_shadow(vm->addr, vm->size);
2253 }
2254

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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