These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / arch / s390 / include / asm / mmu_context.h

diff --git a/kernel/arch/s390/include/asm/mmu_context.h b/kernel/arch/s390/include/asm/mmu_context.h
index fb1b93e..e485817 100644 (file)
--- a/kernel/arch/s390/include/asm/mmu_context.h
+++ b/kernel/arch/s390/include/asm/mmu_context.h
@@ -15,17 +15,25 @@
 static inline int init_new_context(struct task_struct *tsk,
                                   struct mm_struct *mm)
 {
+       spin_lock_init(&mm->context.list_lock);
+       INIT_LIST_HEAD(&mm->context.pgtable_list);
+       INIT_LIST_HEAD(&mm->context.gmap_list);
        cpumask_clear(&mm->context.cpu_attach_mask);
        atomic_set(&mm->context.attach_count, 0);
        mm->context.flush_mm = 0;
-       mm->context.asce_bits = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS;
-       mm->context.asce_bits |= _ASCE_TYPE_REGION3;
 #ifdef CONFIG_PGSTE
        mm->context.alloc_pgste = page_table_allocate_pgste;
        mm->context.has_pgste = 0;
        mm->context.use_skey = 0;
 #endif
-       mm->context.asce_limit = STACK_TOP_MAX;
+       if (mm->context.asce_limit == 0) {
+               /* context created by exec, set asce limit to 4TB */
+               mm->context.asce_bits = _ASCE_TABLE_LENGTH |
+                       _ASCE_USER_BITS | _ASCE_TYPE_REGION3;
+               mm->context.asce_limit = STACK_TOP_MAX;
+       } else if (mm->context.asce_limit == (1UL << 31)) {
+               mm_inc_nr_pmds(mm);
+       }
        crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm));
        return 0;
 }
@@ -111,8 +119,6 @@ static inline void activate_mm(struct mm_struct *prev,
 static inline void arch_dup_mmap(struct mm_struct *oldmm,
                                 struct mm_struct *mm)
 {
-       if (oldmm->context.asce_limit < mm->context.asce_limit)
-               crst_table_downgrade(mm, oldmm->context.asce_limit);
 }
 
 static inline void arch_exit_mmap(struct mm_struct *mm)