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The #ifdef around pud_clear() is very weird, but needed to
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compile bootstrapping arch/x86/boot/compressed/error.c,
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which arch/x86/boot/compressed/misc.h does
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#undef CONFIG_PARAVIRT
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and codepath inside arch/x86/include/asm/pgtable.h
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goes into generally unused codepath, which does
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#ifndef __PAGETABLE_PMD_FOLDED	/* never defined */
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#define pud_clear(pud)                  native_pud_clear(pud)
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#endif
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which will duplicate define pud_clear().
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diff -up ./arch/x86/include/asm/pgtable-3level.h.pud ./arch/x86/include/asm/pgtable-3level.h
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--- ./arch/x86/include/asm/pgtable-3level.h.pud	2018-11-02 13:21:03.000000000 +0900
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+++ ./arch/x86/include/asm/pgtable-3level.h	2018-11-02 13:20:08.000000000 +0900
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@@ -129,12 +129,11 @@ static inline void native_pmd_clear(pmd_
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 	*(tmp + 1) = 0;
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 }
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-#ifndef CONFIG_SMP
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 static inline void native_pud_clear(pud_t *pudp)
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 {
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 }
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-#endif
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+#if /*defined(__PAGETABLE_PMD_FOLDED) &&*/ defined(CONFIG_PARAVIRT)
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 static inline void pud_clear(pud_t *pudp)
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 {
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 	mm_track_pud(pudp);
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@@ -151,6 +150,7 @@ static inline void pud_clear(pud_t *pudp
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 	 * pud_clear_bad()), so we don't need TLB flush here.
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 	 */
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 }
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+#endif
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 #ifdef CONFIG_SMP
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 static inline pte_t native_ptep_get_and_clear(pte_t *ptep)