[PATCH -next 3/3] kasan: arm64: Fix pcpu_page_first_chunk crash with KASAN_VMALLOC

[Kefeng Wang]

On 2021/7/5 22:10, kernel test robot wrote:
> 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 at 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]
should add  a stub function when KASAN is not enabled, thanks.
>      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
>