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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/arch/s390/include/asm/mmu_context.h
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@@ -18,14 +18,16 @@
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 static inline int init_new_context(struct task_struct *tsk,
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 				   struct mm_struct *mm)
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 {
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+	unsigned long asce_type, init_entry;
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+
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 	spin_lock_init(&mm->context.lock);
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 	INIT_LIST_HEAD(&mm->context.pgtable_list);
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 	INIT_LIST_HEAD(&mm->context.gmap_list);
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 	cpumask_clear(&mm->context.cpu_attach_mask);
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 	atomic_set(&mm->context.flush_count, 0);
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+	atomic_set(&mm->context.is_protected, 0);
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 	mm->context.gmap_asce = 0;
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 	mm->context.flush_mm = 0;
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-	mm->context.compat_mm = test_thread_flag(TIF_31BIT);
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 #ifdef CONFIG_PGSTE
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 	mm->context.alloc_pgste = page_table_allocate_pgste ||
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 		test_thread_flag(TIF_PGSTE) ||
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@@ -36,33 +38,34 @@
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 	mm->context.allow_gmap_hpage_1m = 0;
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 #endif
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 	switch (mm->context.asce_limit) {
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-	case _REGION2_SIZE:
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+	default:
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 		/*
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-		 * forked 3-level task, fall through to set new asce with new
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-		 * mm->pgd
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+		 * context created by exec, the value of asce_limit can
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+		 * only be zero in this case
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 		 */
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-	case 0:
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-		/* context created by exec, set asce limit to 4TB */
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-		mm->context.asce_limit = STACK_TOP_MAX;
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-		mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH |
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-				   _ASCE_USER_BITS | _ASCE_TYPE_REGION3;
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+		VM_BUG_ON(mm->context.asce_limit);
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+		/* continue as 3-level task */
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+		mm->context.asce_limit = _REGION2_SIZE;
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+		fallthrough;
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+	case _REGION2_SIZE:
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+		/* forked 3-level task */
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+		init_entry = _REGION3_ENTRY_EMPTY;
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+		asce_type = _ASCE_TYPE_REGION3;
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 		break;
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-	case -PAGE_SIZE:
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-		/* forked 5-level task, set new asce with new_mm->pgd */
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-		mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH |
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-			_ASCE_USER_BITS | _ASCE_TYPE_REGION1;
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+	case TASK_SIZE_MAX:
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+		/* forked 5-level task */
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+		init_entry = _REGION1_ENTRY_EMPTY;
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+		asce_type = _ASCE_TYPE_REGION1;
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 		break;
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 	case _REGION1_SIZE:
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-		/* forked 4-level task, set new asce with new mm->pgd */
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-		mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH |
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-				   _ASCE_USER_BITS | _ASCE_TYPE_REGION2;
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+		/* forked 4-level task */
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+		init_entry = _REGION2_ENTRY_EMPTY;
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+		asce_type = _ASCE_TYPE_REGION2;
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 		break;
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-	case _REGION3_SIZE:
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-		/* forked 2-level compat task, set new asce with new mm->pgd */
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-		mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH |
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-				   _ASCE_USER_BITS | _ASCE_TYPE_SEGMENT;
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 	}
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-	crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm));
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+	mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH |
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+			   _ASCE_USER_BITS | asce_type;
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+	crst_table_init((unsigned long *) mm->pgd, init_entry);
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 	return 0;
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 }
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