Subject: Re: linux-next: build failure after merge of the akpm-current tree

From: Christoph Hellwig <[email-masked]>
Date: Wed, 26 Jun 2019 15:13:18 +0200

As that function is in code only there to provide compile coverage
something like this should fix the problem:

diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h
index 547ff96fb228..1599de730532 100644
--- a/arch/sparc/include/asm/pgtable_64.h
+++ b/arch/sparc/include/asm/pgtable_64.h
@@ -861,10 +861,12 @@ static inline unsigned long pud_page_vaddr(pud_t pud)
 #define pud_clear(pudp)			(pud_val(*(pudp)) = 0UL)
 #define pgd_page_vaddr(pgd)		\
 	((unsigned long) __va(pgd_val(pgd)))
-#define pgd_page(pgd)			pfn_to_page(pgd_pfn(pgd))
 #define pgd_present(pgd)		(pgd_val(pgd) != 0U)
 #define pgd_clear(pgdp)			(pgd_val(*(pgdp)) = 0UL)
 
+/* only used by the stubbed out hugetlb gup code, should never be called */
+#define pgd_page(pgd)			NULL
+
 static inline unsigned long pud_large(pud_t pud)
 {
 	pte_t pte = __pte(pud_val(pud));