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Diffstat (limited to 'kernel/fork.c')
-rw-r--r--kernel/fork.c52
1 files changed, 24 insertions, 28 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index f00e319d8376..2c8857e12855 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -114,6 +114,10 @@ int nr_processes(void)
return total;
}
+void __weak arch_release_task_struct(struct task_struct *tsk)
+{
+}
+
#ifndef CONFIG_ARCH_TASK_STRUCT_ALLOCATOR
static struct kmem_cache *task_struct_cachep;
@@ -122,17 +126,17 @@ static inline struct task_struct *alloc_task_struct_node(int node)
return kmem_cache_alloc_node(task_struct_cachep, GFP_KERNEL, node);
}
-void __weak arch_release_task_struct(struct task_struct *tsk) { }
-
static inline void free_task_struct(struct task_struct *tsk)
{
- arch_release_task_struct(tsk);
kmem_cache_free(task_struct_cachep, tsk);
}
#endif
+void __weak arch_release_thread_info(struct thread_info *ti)
+{
+}
+
#ifndef CONFIG_ARCH_THREAD_INFO_ALLOCATOR
-void __weak arch_release_thread_info(struct thread_info *ti) { }
/*
* Allocate pages if THREAD_SIZE is >= PAGE_SIZE, otherwise use a
@@ -150,7 +154,6 @@ static struct thread_info *alloc_thread_info_node(struct task_struct *tsk,
static inline void free_thread_info(struct thread_info *ti)
{
- arch_release_thread_info(ti);
free_pages((unsigned long)ti, THREAD_SIZE_ORDER);
}
# else
@@ -164,7 +167,6 @@ static struct thread_info *alloc_thread_info_node(struct task_struct *tsk,
static void free_thread_info(struct thread_info *ti)
{
- arch_release_thread_info(ti);
kmem_cache_free(thread_info_cache, ti);
}
@@ -205,10 +207,12 @@ static void account_kernel_stack(struct thread_info *ti, int account)
void free_task(struct task_struct *tsk)
{
account_kernel_stack(tsk->stack, -1);
+ arch_release_thread_info(tsk->stack);
free_thread_info(tsk->stack);
rt_mutex_debug_task_free(tsk);
ftrace_graph_exit_task(tsk);
put_seccomp_filter(tsk);
+ arch_release_task_struct(tsk);
free_task_struct(tsk);
}
EXPORT_SYMBOL(free_task);
@@ -298,23 +302,16 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
return NULL;
ti = alloc_thread_info_node(tsk, node);
- if (!ti) {
- free_task_struct(tsk);
- return NULL;
- }
+ if (!ti)
+ goto free_tsk;
err = arch_dup_task_struct(tsk, orig);
+ if (err)
+ goto free_ti;
- /*
- * We defer looking at err, because we will need this setup
- * for the clean up path to work correctly.
- */
tsk->stack = ti;
- setup_thread_stack(tsk, orig);
-
- if (err)
- goto out;
+ setup_thread_stack(tsk, orig);
clear_user_return_notifier(tsk);
clear_tsk_need_resched(tsk);
stackend = end_of_stack(tsk);
@@ -338,8 +335,9 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
return tsk;
-out:
+free_ti:
free_thread_info(ti);
+free_tsk:
free_task_struct(tsk);
return NULL;
}
@@ -383,16 +381,14 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
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,
- -pages);
+ -vma_pages(mpnt));
continue;
}
charge = 0;
if (mpnt->vm_flags & VM_ACCOUNT) {
- unsigned long len;
- len = (mpnt->vm_end - mpnt->vm_start) >> PAGE_SHIFT;
+ unsigned long len = vma_pages(mpnt);
+
if (security_vm_enough_memory_mm(oldmm, len)) /* sic */
goto fail_nomem;
charge = len;
@@ -459,8 +455,8 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
if (retval)
goto out;
- if (file && uprobe_mmap(tmp))
- goto out;
+ if (file)
+ uprobe_mmap(tmp);
}
/* a new mm has just been created */
arch_dup_mmap(oldmm, mm);
@@ -1310,7 +1306,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
#ifdef CONFIG_DEBUG_MUTEXES
p->blocked_on = NULL; /* not blocked yet */
#endif
-#ifdef CONFIG_CGROUP_MEM_RES_CTLR
+#ifdef CONFIG_MEMCG
p->memcg_batch.do_batch = 0;
p->memcg_batch.memcg = NULL;
#endif
@@ -1420,7 +1416,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
*/
p->group_leader = p;
INIT_LIST_HEAD(&p->thread_group);
- INIT_HLIST_HEAD(&p->task_works);
+ p->task_works = NULL;
/* Now that the task is set up, run cgroup callbacks if
* necessary. We need to run them before the task is visible