[Devel] [PATCH RHEL7 COMMIT] proc connector: use generic event helper for comm event

[Konstantin Khorenko]

The commit is pushed to "branch-rh7-3.10.0-514.26.1.vz7.35.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-514.26.1.vz7.35.5
------>
commit 5e8a090a6347dc8364c23612aaf6a225254a0c53
Author: Stanislav Kinsburskiy <skinsbursky at virtuozzo.com>
Date:   Thu Aug 31 17:40:36 2017 +0300

    proc connector: use generic event helper for comm event
    
    Signed-off-by: Stanislav Kinsburskiy <skinsbursky at virtuozzo.com>
    Reviewed-by: Andrey Ryabinin <aryabinin at virtuozzo.com>
---
 drivers/connector/cn_proc.c | 28 +++++++---------------------
 1 file changed, 7 insertions(+), 21 deletions(-)

diff --git a/drivers/connector/cn_proc.c b/drivers/connector/cn_proc.c
index 36a53fd..2d5ff7c 100644
--- a/drivers/connector/cn_proc.c
+++ b/drivers/connector/cn_proc.c
@@ -208,32 +208,18 @@ void proc_ptrace_connector(struct task_struct *task, int ptrace_id)
 			     fill_ptrace_event);
 }
 
-void proc_comm_connector(struct task_struct *task)
+static bool fill_comm_event(struct proc_event *ev, struct task_struct *task,
+			    int unused)
 {
-	struct cn_msg *msg;
-	struct proc_event *ev;
-	struct timespec ts;
-	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
-
-	if (atomic_read(&proc_event_num_listeners) < 1)
-		return;
-
-	msg = buffer_to_cn_msg(buffer);
-	ev = (struct proc_event *)msg->data;
-	memset(&ev->event_data, 0, sizeof(ev->event_data));
-	get_seq(&msg->seq, &ev->cpu);
-	ktime_get_ts(&ts); /* get high res monotonic timestamp */
-	ev->timestamp_ns = timespec_to_ns(&ts);
-	ev->what = PROC_EVENT_COMM;
 	ev->event_data.comm.process_pid  = task->pid;
 	ev->event_data.comm.process_tgid = task->tgid;
 	get_task_comm(ev->event_data.comm.comm, task);
+	return true;
+}
 
-	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
-	msg->ack = 0; /* not used */
-	msg->len = sizeof(*ev);
-	msg->flags = 0; /* not used */
-	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
+void proc_comm_connector(struct task_struct *task)
+{
+	proc_event_connector(task, PROC_EVENT_COMM, 0, fill_comm_event);
 }
 
 void proc_coredump_connector(struct task_struct *task)