[PATCH] Fixup for Update generic gup implementation

[Steve Capper]

The patch:
mm: Update generic gup implementation to handle hugepage directory

will not compile for arm or arm64 due to pgd_huge being undefined.

Signed-off-by: Steve Capper <steve.capper@xxxxxxxxxx>
---
 arch/arm/include/asm/pgtable.h   | 2 ++
 arch/arm64/include/asm/pgtable.h | 2 ++
 include/linux/hugetlb.h          | 1 -
 3 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h
index 90aa4583..46f81fb 100644
--- a/arch/arm/include/asm/pgtable.h
+++ b/arch/arm/include/asm/pgtable.h
@@ -181,6 +181,8 @@ extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 /* to find an entry in a kernel page-table-directory */
 #define pgd_offset_k(addr)	pgd_offset(&init_mm, addr)
 
+#define pgd_huge(pgd)		(0)
+
 #define pmd_none(pmd)		(!pmd_val(pmd))
 #define pmd_present(pmd)	(pmd_val(pmd))
 
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 464c5ce..d4462ca 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -462,6 +462,8 @@ static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 extern pgd_t idmap_pg_dir[PTRS_PER_PGD];
 
+#define pgd_huge(pgd)		(0)
+
 /*
  * Encode and decode a swap entry:
  *	bits 0-1:	present (must be zero)
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 65e12a2..6e6d338 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -138,7 +138,6 @@ static inline void hugetlb_show_meminfo(void)
 #define prepare_hugepage_range(file, addr, len)	(-EINVAL)
 #define pmd_huge(x)	0
 #define pud_huge(x)	0
-#define pgd_huge(x)	0
 #define is_hugepage_only_range(mm, addr, len)	0
 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
 #define hugetlb_fault(mm, vma, addr, flags)	({ BUG(); 0; })
-- 
1.9.3
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