diff options
Diffstat (limited to 'kernel/fork.c')
| -rw-r--r-- | kernel/fork.c | 31 |
1 files changed, 14 insertions, 17 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index 280bd44ac44..8a069612eac 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -182,37 +182,37 @@ static struct task_struct *dup_task_struct(struct task_struct *orig) } #ifdef CONFIG_MMU -static inline int dup_mmap(struct mm_struct * mm, struct mm_struct * oldmm) +static inline int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm) { - struct vm_area_struct * mpnt, *tmp, **pprev; + struct vm_area_struct *mpnt, *tmp, **pprev; struct rb_node **rb_link, *rb_parent; int retval; unsigned long charge; struct mempolicy *pol; down_write(&oldmm->mmap_sem); - flush_cache_mm(current->mm); + flush_cache_mm(oldmm); + down_write(&mm->mmap_sem); + mm->locked_vm = 0; mm->mmap = NULL; mm->mmap_cache = NULL; mm->free_area_cache = oldmm->mmap_base; mm->cached_hole_size = ~0UL; mm->map_count = 0; - set_mm_counter(mm, rss, 0); - set_mm_counter(mm, anon_rss, 0); cpus_clear(mm->cpu_vm_mask); mm->mm_rb = RB_ROOT; rb_link = &mm->mm_rb.rb_node; rb_parent = NULL; pprev = &mm->mmap; - for (mpnt = current->mm->mmap ; mpnt ; mpnt = mpnt->vm_next) { + for (mpnt = oldmm->mmap; mpnt; mpnt = mpnt->vm_next) { struct file *file; if (mpnt->vm_flags & VM_DONTCOPY) { long pages = vma_pages(mpnt); mm->total_vm -= pages; - __vm_stat_account(mm, mpnt->vm_flags, mpnt->vm_file, + vm_stat_account(mm, mpnt->vm_flags, mpnt->vm_file, -pages); continue; } @@ -253,12 +253,8 @@ static inline int dup_mmap(struct mm_struct * mm, struct mm_struct * oldmm) } /* - * Link in the new vma and copy the page table entries: - * link in first so that swapoff can see swap entries. - * Note that, exceptionally, here the vma is inserted - * without holding mm->mmap_sem. + * Link in the new vma and copy the page table entries. */ - spin_lock(&mm->page_table_lock); *pprev = tmp; pprev = &tmp->vm_next; @@ -267,8 +263,7 @@ static inline int dup_mmap(struct mm_struct * mm, struct mm_struct * oldmm) rb_parent = &tmp->vm_rb; mm->map_count++; - retval = copy_page_range(mm, current->mm, tmp); - spin_unlock(&mm->page_table_lock); + retval = copy_page_range(mm, oldmm, tmp); if (tmp->vm_ops && tmp->vm_ops->open) tmp->vm_ops->open(tmp); @@ -277,9 +272,9 @@ static inline int dup_mmap(struct mm_struct * mm, struct mm_struct * oldmm) goto out; } retval = 0; - out: - flush_tlb_mm(current->mm); + up_write(&mm->mmap_sem); + flush_tlb_mm(oldmm); up_write(&oldmm->mmap_sem); return retval; fail_nomem_policy: @@ -323,6 +318,8 @@ static struct mm_struct * mm_init(struct mm_struct * mm) INIT_LIST_HEAD(&mm->mmlist); mm->core_waiters = 0; mm->nr_ptes = 0; + set_mm_counter(mm, file_rss, 0); + set_mm_counter(mm, anon_rss, 0); spin_lock_init(&mm->page_table_lock); rwlock_init(&mm->ioctx_list_lock); mm->ioctx_list = NULL; @@ -499,7 +496,7 @@ static int copy_mm(unsigned long clone_flags, struct task_struct * tsk) if (retval) goto free_pt; - mm->hiwater_rss = get_mm_counter(mm,rss); + mm->hiwater_rss = get_mm_rss(mm); mm->hiwater_vm = mm->total_vm; good_mm: |