Looks like I also missed the build config that includes CONFIG_HIGHMEM64G && CONFIG_PARAVIRT to export the native_pud_clear() dummy function. Fix: commit e5d56efc ("mm,x86: fix SMP x86 32bit build for native_pud_clear()") Reported-by: Laura Abbott <labbott(a)redhat.com&gt; Reported-by: Boris Ostrovsky <boris.ostrovsky(a)oracle.com&gt; Signed-off-by: Dave Jiang <dave.jiang(a)intel.com&gt; --- arch/x86/include/asm/pgtable-3level.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/include/asm/pgtable-3level.h b/arch/x86/include/asm/pgtable-3level.h index 8f50fb3..72277b1 100644 --- a/arch/x86/include/asm/pgtable-3level.h +++ b/arch/x86/include/asm/pgtable-3level.h @@ -121,7 +121,8 @@ static inline void native_pmd_clear(pmd_t *pmd) *(tmp + 1) = 0; } -#ifndef CONFIG_SMP +#if !defined(CONFIG_SMP) || (defined(CONFIG_HIGHMEM64G) && \ + defined(CONFIG_PARAVIRT)) static inline void native_pud_clear(pud_t *pudp) { }