diff options
Diffstat (limited to 'arch/s390/include/asm/mmu_context.h')
| -rw-r--r-- | arch/s390/include/asm/mmu_context.h | 45 |
1 files changed, 24 insertions, 21 deletions
diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h index 8d04e6f3f796..c9f3d8a52756 100644 --- a/arch/s390/include/asm/mmu_context.h +++ b/arch/s390/include/asm/mmu_context.h @@ -18,14 +18,16 @@ static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm) { + unsigned long asce_type, init_entry; + spin_lock_init(&mm->context.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.flush_count, 0); + atomic_set(&mm->context.is_protected, 0); mm->context.gmap_asce = 0; mm->context.flush_mm = 0; - mm->context.compat_mm = test_thread_flag(TIF_31BIT); #ifdef CONFIG_PGSTE mm->context.alloc_pgste = page_table_allocate_pgste || test_thread_flag(TIF_PGSTE) || @@ -36,33 +38,34 @@ static inline int init_new_context(struct task_struct *tsk, mm->context.allow_gmap_hpage_1m = 0; #endif switch (mm->context.asce_limit) { - case _REGION2_SIZE: + default: /* - * forked 3-level task, fall through to set new asce with new - * mm->pgd + * context created by exec, the value of asce_limit can + * only be zero in this case */ - case 0: - /* context created by exec, set asce limit to 4TB */ - mm->context.asce_limit = STACK_TOP_MAX; - mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH | - _ASCE_USER_BITS | _ASCE_TYPE_REGION3; + VM_BUG_ON(mm->context.asce_limit); + /* continue as 3-level task */ + mm->context.asce_limit = _REGION2_SIZE; + fallthrough; + case _REGION2_SIZE: + /* forked 3-level task */ + init_entry = _REGION3_ENTRY_EMPTY; + asce_type = _ASCE_TYPE_REGION3; break; - case -PAGE_SIZE: - /* forked 5-level task, set new asce with new_mm->pgd */ - mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH | - _ASCE_USER_BITS | _ASCE_TYPE_REGION1; + case TASK_SIZE_MAX: + /* forked 5-level task */ + init_entry = _REGION1_ENTRY_EMPTY; + asce_type = _ASCE_TYPE_REGION1; break; case _REGION1_SIZE: - /* forked 4-level task, set new asce with new mm->pgd */ - mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH | - _ASCE_USER_BITS | _ASCE_TYPE_REGION2; + /* forked 4-level task */ + init_entry = _REGION2_ENTRY_EMPTY; + asce_type = _ASCE_TYPE_REGION2; break; - case _REGION3_SIZE: - /* forked 2-level compat task, set new asce with new mm->pgd */ - mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH | - _ASCE_USER_BITS | _ASCE_TYPE_SEGMENT; } - crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm)); + mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH | + _ASCE_USER_BITS | asce_type; + crst_table_init((unsigned long *) mm->pgd, init_entry); return 0; } |