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

From: kernel test robot <lkp@intel.com>
To: Kefeng Wang <wangkefeng.wang@huawei.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Andrey Ryabinin <ryabinin.a.a@gmail.com>,
	Andrey Konovalov <andreyknvl@gmail.com>,
	Dmitry Vyukov <dvyukov@google.com>
Cc: kbuild-all@lists.01.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com,
	linux-mm@kvack.org, Kefeng Wang <wangkefeng.wang@huawei.com>
Subject: Re: [PATCH -next 3/3] kasan: arm64: Fix pcpu_page_first_chunk crash with KASAN_VMALLOC
Date: Mon, 5 Jul 2021 22:10:52 +0800	[thread overview]
Message-ID: <202107052207.RUhTJd4N-lkp@intel.com> (raw)
In-Reply-To: <20210705111453.164230-4-wangkefeng.wang@huawei.com>

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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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