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authorOleg Nesterov <oleg@redhat.com>2012-03-23 15:02:46 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-03-23 16:58:41 -0700
commita02d6fd643cbd4c559113b35b31d3b04e4ec60c7 (patch)
tree77bb1bca3380e8a8187bbeb25af6a03307401887
parentd2d393099de21eda91c5ec6a05d60e5dee4d5175 (diff)
downloadop-kernel-dev-a02d6fd643cbd4c559113b35b31d3b04e4ec60c7.zip
op-kernel-dev-a02d6fd643cbd4c559113b35b31d3b04e4ec60c7.tar.gz
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>
-rw-r--r--kernel/pid_namespace.c8
1 files changed, 2 insertions, 6 deletions
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index a896839..17b2328 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();
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