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The #ifdef around pud_clear() is very weird, but needed to
compile bootstrapping arch/x86/boot/compressed/error.c,
which arch/x86/boot/compressed/misc.h does
#undef CONFIG_PARAVIRT
and codepath inside arch/x86/include/asm/pgtable.h
goes into generally unused codepath, which does
#ifndef __PAGETABLE_PMD_FOLDED	/* never defined */
#define pud_clear(pud)                  native_pud_clear(pud)
#endif
which will duplicate define pud_clear().



diff -up ./arch/x86/include/asm/pgtable-3level.h.pud ./arch/x86/include/asm/pgtable-3level.h
--- ./arch/x86/include/asm/pgtable-3level.h.pud	2018-11-02 13:21:03.000000000 +0900
+++ ./arch/x86/include/asm/pgtable-3level.h	2018-11-02 13:20:08.000000000 +0900
@@ -129,12 +129,11 @@ static inline void native_pmd_clear(pmd_
 	*(tmp + 1) = 0;
 }
 
-#ifndef CONFIG_SMP
 static inline void native_pud_clear(pud_t *pudp)
 {
 }
-#endif
 
+#if /*defined(__PAGETABLE_PMD_FOLDED) &&*/ defined(CONFIG_PARAVIRT)
 static inline void pud_clear(pud_t *pudp)
 {
 	mm_track_pud(pudp);
@@ -151,6 +150,7 @@ static inline void pud_clear(pud_t *pudp
 	 * pud_clear_bad()), so we don't need TLB flush here.
 	 */
 }
+#endif
 
 #ifdef CONFIG_SMP
 static inline pte_t native_ptep_get_and_clear(pte_t *ptep)