Re: [PATCH v2 2/4] x86/xen: add basic KASAN support for PV kernel

[kbuild test robot]

Hi Sergey,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on xen-tip/linux-next]
[also build test ERROR on tip/x86/mm tip/auto-latest linux/master linus/master v5.5-rc7 next-20200121]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Sergey-Dyasli/basic-KASAN-support-for-Xen-PV-domains/20200118-073544
base:   https://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git linux-next
config: x86_64-randconfig-a002-20200121 (attached as .config)
compiler: gcc-6 (Debian 6.3.0-18+deb9u1) 6.3.0 20170516
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   arch/x86/xen/mmu_pv.c: In function 'xen_pv_kasan_early_init':
>> arch/x86/xen/mmu_pv.c:1778:16: error: 'kasan_early_shadow_pud' undeclared (first use in this function)
     set_page_prot(kasan_early_shadow_pud, PAGE_KERNEL_RO);
                   ^~~~~~~~~~~~~~~~~~~~~~
   arch/x86/xen/mmu_pv.c:1778:16: note: each undeclared identifier is reported only once for each function it appears in
>> arch/x86/xen/mmu_pv.c:1779:16: error: 'kasan_early_shadow_pmd' undeclared (first use in this function)
     set_page_prot(kasan_early_shadow_pmd, PAGE_KERNEL_RO);
                   ^~~~~~~~~~~~~~~~~~~~~~
>> arch/x86/xen/mmu_pv.c:1780:16: error: 'kasan_early_shadow_pte' undeclared (first use in this function)
     set_page_prot(kasan_early_shadow_pte, PAGE_KERNEL_RO);
                   ^~~~~~~~~~~~~~~~~~~~~~

vim +/kasan_early_shadow_pud +1778 arch/x86/xen/mmu_pv.c

  1774	
  1775	pgd_t * __init xen_pv_kasan_early_init(void)
  1776	{
  1777		/* PV page tables must be read-only */
> 1778		set_page_prot(kasan_early_shadow_pud, PAGE_KERNEL_RO);
> 1779		set_page_prot(kasan_early_shadow_pmd, PAGE_KERNEL_RO);
> 1780		set_page_prot(kasan_early_shadow_pte, PAGE_KERNEL_RO);
  1781	
  1782		/* Return a pointer to the initial PV page tables */
  1783		return (pgd_t *)xen_start_info->pt_base;
  1784	}
  1785	

---
0-DAY kernel test infrastructure                 Open Source Technology Center
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