powerpc/mm: refactor pgd_alloc() and pgd_free() on nohash

pgd_alloc() and pgd_free() are identical on nohash 32 and 64.
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/nohash/32/pgalloc.h

@@ -5,17 +5,6 @@
 #include <linux/threads.h>
 #include <linux/slab.h>
 
-static inline pgd_t *pgd_alloc(struct mm_struct *mm)
-{
-	return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),
-			pgtable_gfp_flags(mm, GFP_KERNEL));
-}
-
-static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
-{
-	kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
-}
-
 /*
  * We don't have any real pmd's, and this code never triggers because
  * the pgd will always be present..

arch/powerpc/include/asm/nohash/64/pgalloc.h

@@ -18,17 +18,6 @@ struct vmemmap_backing {
 };
 extern struct vmemmap_backing *vmemmap_list;
 
-static inline pgd_t *pgd_alloc(struct mm_struct *mm)
-{
-	return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),
-			pgtable_gfp_flags(mm, GFP_KERNEL));
-}
-
-static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
-{
-	kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
-}
-
 #define pgd_populate(MM, PGD, PUD)	pgd_set(PGD, (unsigned long)PUD)
 
 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)

arch/powerpc/include/asm/nohash/pgalloc.h

@@ -3,6 +3,7 @@
 #define _ASM_POWERPC_NOHASH_PGALLOC_H
 
 #include <linux/mm.h>
+#include <linux/slab.h>
 
 extern void tlb_remove_table(struct mmu_gather *tlb, void *table);
 #ifdef CONFIG_PPC64
@@ -16,6 +17,17 @@ static inline void tlb_flush_pgtable(struct mmu_gather *tlb,
 }
 #endif /* !CONFIG_PPC_BOOK3E */
 
+static inline pgd_t *pgd_alloc(struct mm_struct *mm)
+{
+	return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),
+			pgtable_gfp_flags(mm, GFP_KERNEL));
+}
+
+static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
+{
+	kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
+}
+
 #ifdef CONFIG_PPC64
 #include <asm/nohash/64/pgalloc.h>
 #else