diff options
Diffstat (limited to 'kernel/fork.c')
| -rw-r--r-- | kernel/fork.c | 30 |
1 files changed, 14 insertions, 16 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index 177ce7438d..10917c3e1f 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -733,7 +733,7 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm, get_file(file); i_mmap_lock_write(mapping); - if (tmp->vm_flags & VM_SHARED) + if (vma_is_shared_maywrite(tmp)) mapping_allow_writable(mapping); flush_dcache_mmap_lock(mapping); /* insert tmp into the share list, just after mpnt */ @@ -1393,6 +1393,8 @@ EXPORT_SYMBOL_GPL(mmput_async); /** * set_mm_exe_file - change a reference to the mm's executable file + * @mm: The mm to change. + * @new_exe_file: The new file to use. * * This changes mm's executable file (shown as symlink /proc/[pid]/exe). * @@ -1432,6 +1434,8 @@ int set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file) /** * replace_mm_exe_file - replace a reference to the mm's executable file + * @mm: The mm to change. + * @new_exe_file: The new file to use. * * This changes mm's executable file (shown as symlink /proc/[pid]/exe). * @@ -1483,6 +1487,7 @@ int replace_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file) /** * get_mm_exe_file - acquire a reference to the mm's executable file + * @mm: The mm of interest. * * Returns %NULL if mm has no associated executable file. * User must release file via fput(). @@ -1492,15 +1497,14 @@ struct file *get_mm_exe_file(struct mm_struct *mm) struct file *exe_file; rcu_read_lock(); - exe_file = rcu_dereference(mm->exe_file); - if (exe_file && !get_file_rcu(exe_file)) - exe_file = NULL; + exe_file = get_file_rcu(&mm->exe_file); rcu_read_unlock(); return exe_file; } /** * get_task_exe_file - acquire a reference to the task's executable file + * @task: The task. * * Returns %NULL if task's mm (if any) has no associated executable file or * this is a kernel thread with borrowed mm (see the comment above get_task_mm). @@ -1523,6 +1527,7 @@ struct file *get_task_exe_file(struct task_struct *task) /** * get_task_mm - acquire a reference to the task's mm + * @task: The task. * * Returns %NULL if the task has no mm. Checks PF_KTHREAD (meaning * this kernel workthread has transiently adopted a user mm with use_mm, @@ -2102,11 +2107,11 @@ const struct file_operations pidfd_fops = { * __pidfd_prepare - allocate a new pidfd_file and reserve a pidfd * @pid: the struct pid for which to create a pidfd * @flags: flags of the new @pidfd - * @pidfd: the pidfd to return + * @ret: Where to return the file for the pidfd. * * Allocate a new file that stashes @pid and reserve a new pidfd number in the * caller's file descriptor table. The pidfd is reserved but not installed yet. - + * * The helper doesn't perform checks on @pid which makes it useful for pidfds * created via CLONE_PIDFD where @pid has no task attached when the pidfd and * pidfd file are prepared. @@ -2153,7 +2158,7 @@ static int __pidfd_prepare(struct pid *pid, unsigned int flags, struct file **re * pidfd_prepare - allocate a new pidfd_file and reserve a pidfd * @pid: the struct pid for which to create a pidfd * @flags: flags of the new @pidfd - * @pidfd: the pidfd to return + * @ret: Where to return the pidfd. * * Allocate a new file that stashes @pid and reserve a new pidfd number in the * caller's file descriptor table. The pidfd is reserved but not installed yet. @@ -2406,10 +2411,6 @@ __latent_entropy struct task_struct *copy_process( p->io_uring = NULL; #endif -#if defined(SPLIT_RSS_COUNTING) - memset(&p->rss_stat, 0, sizeof(p->rss_stat)); -#endif - p->default_timer_slack_ns = current->timer_slack_ns; #ifdef CONFIG_PSI @@ -2576,7 +2577,6 @@ __latent_entropy struct task_struct *copy_process( p->dirty_paused_when = 0; p->pdeath_signal = 0; - INIT_LIST_HEAD(&p->thread_group); p->task_works = NULL; clear_posix_cputimers_work(p); @@ -2704,8 +2704,6 @@ __latent_entropy struct task_struct *copy_process( atomic_inc(¤t->signal->live); refcount_inc(¤t->signal->sigcnt); task_join_group_stop(p); - list_add_tail_rcu(&p->thread_group, - &p->group_leader->thread_group); list_add_tail_rcu(&p->thread_node, &p->signal->thread_head); } @@ -3144,7 +3142,7 @@ static inline bool clone3_stack_valid(struct kernel_clone_args *kargs) if (!access_ok((void __user *)kargs->stack, kargs->stack_size)) return false; -#if !defined(CONFIG_STACK_GROWSUP) && !defined(CONFIG_IA64) +#if !defined(CONFIG_STACK_GROWSUP) kargs->stack += kargs->stack_size; #endif } @@ -3181,7 +3179,7 @@ static bool clone3_args_valid(struct kernel_clone_args *kargs) } /** - * clone3 - create a new process with specific properties + * sys_clone3 - create a new process with specific properties * @uargs: argument structure * @size: size of @uargs * |