From a02d6fd643cbd4c559113b35b31d3b04e4ec60c7 Mon Sep 17 00:00:00 2001
From: Oleg Nesterov <oleg@redhat.com>
Date: Fri, 23 Mar 2012 15:02:46 -0700
Subject: signal: zap_pid_ns_processes: s/SEND_SIG_NOINFO/SEND_SIG_FORCED/
Change zap_pid_ns_processes() to use SEND_SIG_FORCED, it looks more
clear compared to SEND_SIG_NOINFO which relies on from_ancestor_ns logic
send_signal().
It is also more efficient if we need to kill a lot of tasks because it
doesn't alloc sigqueue.
While at it, add the __fatal_signal_pending(task) check as a minor
optimization.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Anton Vorontsov <anton.vorontsov@linaro.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
kernel/pid_namespace.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
(limited to 'kernel/pid_namespace.c')
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index a8968396046..17b232869a0 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -168,13 +168,9 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns)
while (nr > 0) {
rcu_read_lock();
- /*
- * Any nested-container's init processes won't ignore the
- * SEND_SIG_NOINFO signal, see send_signal()->si_fromuser().
- */
task = pid_task(find_vpid(nr), PIDTYPE_PID);
- if (task)
- send_sig_info(SIGKILL, SEND_SIG_NOINFO, task);
+ if (task && !__fatal_signal_pending(task))
+ send_sig_info(SIGKILL, SEND_SIG_FORCED, task);
rcu_read_unlock();
--
cgit v1.2.3-70-g09d2