powerpc/mm: don't use _PAGE_EXEC for calling hash_preload()

The 'access' parameter of hash_preload() is either 0 or _PAGE_EXEC.
Among the two versions of hash_preload(), only the PPC64 one is
doing something with this 'access' parameter.

In order to remove the use of _PAGE_EXEC outside platform code,
'access' parameter is replaced by 'is_exec' which will be either
true of false, and the PPC64 version of hash_preload() creates
the access flag based on 'is_exec'.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/mm/hash_utils_64.c

@@ -1482,7 +1482,7 @@ static bool should_hash_preload(struct mm_struct *mm, unsigned long ea)
 #endif
 
 void hash_preload(struct mm_struct *mm, unsigned long ea,
-		  unsigned long access, unsigned long trap)
+		  bool is_exec, unsigned long trap)
 {
 	int hugepage_shift;
 	unsigned long vsid;
@@ -1490,6 +1490,7 @@ void hash_preload(struct mm_struct *mm, unsigned long ea,
 	pte_t *ptep;
 	unsigned long flags;
 	int rc, ssize, update_flags = 0;
+	unsigned long access = _PAGE_PRESENT | _PAGE_READ | (is_exec ? _PAGE_EXEC : 0);
 
 	BUG_ON(REGION_ID(ea) != USER_REGION_ID);
 

arch/powerpc/mm/mem.c

@@ -509,7 +509,8 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
 	 * We don't need to worry about _PAGE_PRESENT here because we are
 	 * called with either mm->page_table_lock held or ptl lock held
 	 */
-	unsigned long access, trap;
+	unsigned long trap;
+	bool is_exec;
 
 	if (radix_enabled()) {
 		prefetch((void *)address);
@@ -531,16 +532,16 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
 	trap = current->thread.regs ? TRAP(current->thread.regs) : 0UL;
 	switch (trap) {
 	case 0x300:
-		access = 0UL;
+		is_exec = false;
 		break;
 	case 0x400:
-		access = _PAGE_EXEC;
+		is_exec = true;
 		break;
 	default:
 		return;
 	}
 
-	hash_preload(vma->vm_mm, address, access, trap);
+	hash_preload(vma->vm_mm, address, is_exec, trap);
 #endif /* CONFIG_PPC_STD_MMU */
 #if (defined(CONFIG_PPC_BOOK3E_64) || defined(CONFIG_PPC_FSL_BOOK3E)) \
 	&& defined(CONFIG_HUGETLB_PAGE)

arch/powerpc/mm/mmu_decl.h

@@ -82,7 +82,7 @@ static inline void _tlbivax_bcast(unsigned long address, unsigned int pid,
 #else /* CONFIG_PPC_MMU_NOHASH */
 
 extern void hash_preload(struct mm_struct *mm, unsigned long ea,
-			 unsigned long access, unsigned long trap);
+			 bool is_exec, unsigned long trap);
 
 
 extern void _tlbie(unsigned long address);

arch/powerpc/mm/pgtable_32.c

@@ -261,7 +261,7 @@ static void __init __mapin_ram_chunk(unsigned long offset, unsigned long top)
 		map_kernel_page(v, p, ktext ? PAGE_KERNEL_TEXT : PAGE_KERNEL);
 #ifdef CONFIG_PPC_STD_MMU_32
 		if (ktext)
-			hash_preload(&init_mm, v, 0, 0x300);
+			hash_preload(&init_mm, v, false, 0x300);
 #endif
 		v += PAGE_SIZE;
 		p += PAGE_SIZE;

arch/powerpc/mm/ppc_mmu_32.c

@@ -163,7 +163,7 @@ void __init setbat(int index, unsigned long virt, phys_addr_t phys,
  * Preload a translation in the hash table
  */
 void hash_preload(struct mm_struct *mm, unsigned long ea,
-		  unsigned long access, unsigned long trap)
+		  bool is_exec, unsigned long trap)
 {
 	pmd_t *pmd;