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SubjectRe: [PATCH v1 2/4] x86/xen: add basic KASAN support for PV kernel
Hi Sergey,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on net-next/master]
[also build test ERROR on net/master linus/master v5.5-rc5 next-20200109]
[cannot apply to xen-tip/linux-next]
[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]

base: 4a4a52d49d11f5c4a0df8b9806c8c5563801f753
config: x86_64-rhel (attached as .config)
compiler: gcc-7 (Debian 7.5.0-3) 7.5.0
# 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 <>

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); did you mean 'kasan_free_shadow'?
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); did you mean 'kasan_early_shadow_pud'?
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); did you mean 'kasan_early_shadow_pmd'?
set_page_prot(kasan_early_shadow_pte, PAGE_KERNEL_RO);

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

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);
1782 /* Return a pointer to the initial PV page tables */
1783 return (pgd_t *)xen_start_info->pt_base;
1784 }

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