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Diffstat (limited to 'kernel/exit.c')
-rw-r--r--kernel/exit.c25
1 files changed, 21 insertions, 4 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index ef2dfa818bf1..7838b4d68774 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1097,6 +1097,7 @@ struct wait_opts {
int __user *wo_stat;
struct rusage __user *wo_rusage;
+ wait_queue_t child_wait;
int notask_error;
};
@@ -1570,20 +1571,35 @@ static int ptrace_do_wait(struct wait_opts *wo, struct task_struct *tsk)
return 0;
}
+static int child_wait_callback(wait_queue_t *wait, unsigned mode,
+ int sync, void *key)
+{
+ struct wait_opts *wo = container_of(wait, struct wait_opts,
+ child_wait);
+ struct task_struct *p = key;
+
+ if (!eligible_child(wo, p))
+ return 0;
+
+ return default_wake_function(wait, mode, sync, key);
+}
+
void __wake_up_parent(struct task_struct *p, struct task_struct *parent)
{
- wake_up_interruptible_sync(&parent->signal->wait_chldexit);
+ __wake_up_sync_key(&parent->signal->wait_chldexit,
+ TASK_INTERRUPTIBLE, 1, p);
}
static long do_wait(struct wait_opts *wo)
{
- DECLARE_WAITQUEUE(wait, current);
struct task_struct *tsk;
int retval;
trace_sched_process_wait(wo->wo_pid);
- add_wait_queue(&current->signal->wait_chldexit,&wait);
+ init_waitqueue_func_entry(&wo->child_wait, child_wait_callback);
+ wo->child_wait.private = current;
+ add_wait_queue(&current->signal->wait_chldexit, &wo->child_wait);
repeat:
/*
* If there is nothing that can match our critiera just get out.
@@ -1624,7 +1640,8 @@ notask:
}
end:
__set_current_state(TASK_RUNNING);
- remove_wait_queue(&current->signal->wait_chldexit,&wait);
+ remove_wait_queue(&current->signal->wait_chldexit, &wo->child_wait);
+
if (wo->wo_info) {
struct siginfo __user *infop = wo->wo_info;