Replace hlist_empty() with the new pid_has_task() helper which is more
idiomatic, easier to grep for, and unifies how callers perform this
check.

Signed-off-by: Christian Brauner <christian.brau...@ubuntu.com>
Reviewed-by: Oleg Nesterov <o...@redhat.com>
---
/* pidfd selftests */
passed

/* v1 */
patch not present

/* v2 */
Link: 
https://lore.kernel.org/r/20191016153606.2326-3-christian.brau...@ubuntu.com
patch introduced

/* v2 */
- Oleg Nesterov <o...@redhat.com>:
  - s/task_alive/pid_has_task/g
---
 kernel/pid.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/pid.c b/kernel/pid.c
index 0a9f2e437217..124d40b239b1 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -299,7 +299,7 @@ static void __change_pid(struct task_struct *task, enum 
pid_type type,
        *pid_ptr = new;
 
        for (tmp = PIDTYPE_MAX; --tmp >= 0; )
-               if (!hlist_empty(&pid->tasks[tmp]))
+               if (pid_has_task(pid, tmp))
                        return;
 
        free_pid(pid);
-- 
2.23.0

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