powerpc: Deduplicate prototypes of ptep_set_access_flags() and phys_mem_access_prot()

Prototypes of ptep_set_access_flags() and phys_mem_access_prot() are identical
for book3s and nohash.

Deduplicate them.

Signed-off-by: Christophe Leroy <[e-mail]>
Signed-off-by: Michael Ellerman <[e-mail]>
Link: https://msgid.link/b846832c[e-mail]

arch/powerpc/include/asm/book3s/pgtable.h

···
 #endif
 
 #ifndef __ASSEMBLY__
-#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
-extern int ptep_set_access_flags(struct vm_area_struct *vma, unsigned long address,
-				 pte_t *ptep, pte_t entry, int dirty);
-
-struct file;
-extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
-				     unsigned long size, pgprot_t vma_prot);
-#define __HAVE_PHYS_MEM_ACCESS_PROT
-
 void __update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep);
 
 /*

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

···
 		mb();
 }
 
-
-#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
-extern int ptep_set_access_flags(struct vm_area_struct *vma, unsigned long address,
-				 pte_t *ptep, pte_t entry, int dirty);
-
 /*
  * Macro to mark a page protection value as "uncacheable".
  */
···
 		(__pgprot(pgprot_val(prot) & ~_PAGE_CACHE_CTL))
 
 #define pgprot_writecombine pgprot_noncached_wc
-
-struct file;
-extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
-				     unsigned long size, pgprot_t vma_prot);
-#define __HAVE_PHYS_MEM_ACCESS_PROT
 
 #ifdef CONFIG_HUGETLB_PAGE
 static inline int hugepd_ok(hugepd_t hpd)

arch/powerpc/include/asm/pgtable.h

···
 static inline void mark_initmem_nx(void) { }
 #endif
 
+#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
+int ptep_set_access_flags(struct vm_area_struct *vma, unsigned long address,
+			  pte_t *ptep, pte_t entry, int dirty);
+
+struct file;
+pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
+			      unsigned long size, pgprot_t vma_prot);
+#define __HAVE_PHYS_MEM_ACCESS_PROT
+
+
 /*
  * When used, PTE_FRAG_NR is defined in subarch pgtable.h
  * so we are sure it is included when arriving here.