do_wait() wakeup optimization: shift security_task_wait() from eligible_child() to wait_consider_task()
Preparation, no functional changes.
eligible_child() has a single caller, wait_consider_task(). We can move
security_task_wait() out from eligible_child(), this allows us to use it
for filtered wake_up().
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Roland McGrath <roland@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Ratan Nalumasu <rnalumasu@gmail.com>
Cc: Vitaly Mayatskikh <vmayatsk@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/kernel/exit.c b/kernel/exit.c
index 782b2e1..ef2dfa8 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1112,8 +1112,6 @@
static int eligible_child(struct wait_opts *wo, struct task_struct *p)
{
- int err;
-
if (wo->wo_type < PIDTYPE_MAX) {
if (task_pid_type(p, wo->wo_type) != wo->wo_pid)
return 0;
@@ -1128,10 +1126,6 @@
&& !(wo->wo_flags & __WALL))
return 0;
- err = security_task_wait(p);
- if (err)
- return err;
-
return 1;
}
@@ -1492,6 +1486,7 @@
if (!ret)
return ret;
+ ret = security_task_wait(p);
if (unlikely(ret < 0)) {
/*
* If we have not yet seen any eligible child,
