Add a new primitive for synchronization between relatives. It will be used in next/further patches.
Signed-off-by: Kirill Tkhai <[email protected]> --- include/linux/init_task.h | 1 + include/linux/sched.h | 1 + kernel/fork.c | 1 + 3 files changed, 3 insertions(+) diff --git a/include/linux/init_task.h b/include/linux/init_task.h index bb9b075..919243a 100644 --- a/include/linux/init_task.h +++ b/include/linux/init_task.h @@ -218,6 +218,7 @@ extern struct task_group root_task_group; .parent = &tsk, \ .children = LIST_HEAD_INIT(tsk.children), \ .sibling = LIST_HEAD_INIT(tsk.sibling), \ + .kin_lock = __RW_LOCK_UNLOCKED(tsk.kin_lock), \ .group_leader = &tsk, \ RCU_POINTER_INITIALIZER(real_cred, &init_cred), \ RCU_POINTER_INITIALIZER(cred, &init_cred), \ diff --git a/include/linux/sched.h b/include/linux/sched.h index af0eeba..58dc09f 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1477,6 +1477,7 @@ struct task_struct { struct list_head children; /* list of my children */ struct list_head sibling; /* linkage in my parent's children list */ struct task_struct *group_leader; /* threadgroup leader */ + rwlock_t kin_lock; /* * ptraced is the list of tasks this task is using ptrace on. diff --git a/kernel/fork.c b/kernel/fork.c index 66e31eb..ee389ba 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1330,6 +1330,7 @@ static struct task_struct *copy_process(unsigned long clone_flags, p->flags |= PF_FORKNOEXEC; INIT_LIST_HEAD(&p->children); INIT_LIST_HEAD(&p->sibling); + rwlock_init(&p->kin_lock); rcu_copy_process(p); p->vfork_done = NULL; spin_lock_init(&p->alloc_lock); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
