diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/fork.c | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index f1af413e5aa4..48a0038f606f 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -463,12 +463,8 @@ struct vm_area_struct *vm_area_dup(struct vm_area_struct *orig) * will be reinitialized. */ data_race(memcpy(new, orig, sizeof(*new))); - vma_lock_init(new); + vma_lock_init(new, true); INIT_LIST_HEAD(&new->anon_vma_chain); -#ifdef CONFIG_PER_VMA_LOCK - /* vma is not locked, can't use vma_mark_detached() */ - new->detached = true; -#endif vma_numab_state_init(new); dup_anon_vma_name(orig, new); @@ -477,6 +473,8 @@ struct vm_area_struct *vm_area_dup(struct vm_area_struct *orig) void __vm_area_free(struct vm_area_struct *vma) { + /* The vma should be detached while being destroyed. */ + vma_assert_detached(vma); vma_numab_state_free(vma); free_anon_vma_name(vma); kmem_cache_free(vm_area_cachep, vma); @@ -488,8 +486,6 @@ static void vm_area_free_rcu_cb(struct rcu_head *head) struct vm_area_struct *vma = container_of(head, struct vm_area_struct, vm_rcu); - /* The vma should not be locked while being destroyed. */ - VM_BUG_ON_VMA(rwsem_is_locked(&vma->vm_lock.lock), vma); __vm_area_free(vma); } #endif @@ -1234,6 +1230,9 @@ static void mmap_init_lock(struct mm_struct *mm) { init_rwsem(&mm->mmap_lock); mm_lock_seqcount_init(mm); +#ifdef CONFIG_PER_VMA_LOCK + rcuwait_init(&mm->vma_writer_wait); +#endif } static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p, |