1 files changed, 158 insertions, 23 deletions

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 34ae736cb1f8..7239d9acd09f 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -102,7 +102,7 @@ static bool ftrace_pids_enabled(struct ftrace_ops *ops)
 
 	tr = ops->private;
 
-	return tr->function_pids != NULL;
+	return tr->function_pids != NULL || tr->function_no_pids != NULL;
 }
 
 static void ftrace_update_trampoline(struct ftrace_ops *ops);
@@ -6931,10 +6931,12 @@ ftrace_filter_pid_sched_switch_probe(void *data, bool preempt,
 {
 	struct trace_array *tr = data;
 	struct trace_pid_list *pid_list;
+	struct trace_pid_list *no_pid_list;
 
 	pid_list = rcu_dereference_sched(tr->function_pids);
+	no_pid_list = rcu_dereference_sched(tr->function_no_pids);
 
-	if (trace_ignore_this_task(pid_list, next))
+	if (trace_ignore_this_task(pid_list, no_pid_list, next))
 		this_cpu_write(tr->array_buffer.data->ftrace_ignore_pid,
 			       FTRACE_PID_IGNORE);
 	else
@@ -6952,6 +6954,9 @@ ftrace_pid_follow_sched_process_fork(void *data,
 
 	pid_list = rcu_dereference_sched(tr->function_pids);
 	trace_filter_add_remove_task(pid_list, self, task);
+
+	pid_list = rcu_dereference_sched(tr->function_no_pids);
+	trace_filter_add_remove_task(pid_list, self, task);
 }
 
 static void
@@ -6962,6 +6967,9 @@ ftrace_pid_follow_sched_process_exit(void *data, struct task_struct *task)
 
 	pid_list = rcu_dereference_sched(tr->function_pids);
 	trace_filter_add_remove_task(pid_list, NULL, task);
+
+	pid_list = rcu_dereference_sched(tr->function_no_pids);
+	trace_filter_add_remove_task(pid_list, NULL, task);
 }
 
 void ftrace_pid_follow_fork(struct trace_array *tr, bool enable)
@@ -6979,42 +6987,64 @@ void ftrace_pid_follow_fork(struct trace_array *tr, bool enable)
 	}
 }
 
-static void clear_ftrace_pids(struct trace_array *tr)
+enum {
+	TRACE_PIDS		= BIT(0),
+	TRACE_NO_PIDS		= BIT(1),
+};
+
+static void clear_ftrace_pids(struct trace_array *tr, int type)
 {
 	struct trace_pid_list *pid_list;
+	struct trace_pid_list *no_pid_list;
 	int cpu;
 
 	pid_list = rcu_dereference_protected(tr->function_pids,
 					     lockdep_is_held(&ftrace_lock));
-	if (!pid_list)
+	no_pid_list = rcu_dereference_protected(tr->function_no_pids,
+						lockdep_is_held(&ftrace_lock));
+
+	/* Make sure there's something to do */
+	if (!(((type & TRACE_PIDS) && pid_list) ||
+	      ((type & TRACE_NO_PIDS) && no_pid_list)))
 		return;
 
-	unregister_trace_sched_switch(ftrace_filter_pid_sched_switch_probe, tr);
+	/* See if the pids still need to be checked after this */
+	if (!((!(type & TRACE_PIDS) && pid_list) ||
+	      (!(type & TRACE_NO_PIDS) && no_pid_list))) {
+		unregister_trace_sched_switch(ftrace_filter_pid_sched_switch_probe, tr);
+		for_each_possible_cpu(cpu)
+			per_cpu_ptr(tr->array_buffer.data, cpu)->ftrace_ignore_pid = FTRACE_PID_TRACE;
+	}
 
-	for_each_possible_cpu(cpu)
-		per_cpu_ptr(tr->array_buffer.data, cpu)->ftrace_ignore_pid = FTRACE_PID_TRACE;
+	if (type & TRACE_PIDS)
+		rcu_assign_pointer(tr->function_pids, NULL);
 
-	rcu_assign_pointer(tr->function_pids, NULL);
+	if (type & TRACE_NO_PIDS)
+		rcu_assign_pointer(tr->function_no_pids, NULL);
 
 	/* Wait till all users are no longer using pid filtering */
 	synchronize_rcu();
 
-	trace_free_pid_list(pid_list);
+	if ((type & TRACE_PIDS) && pid_list)
+		trace_free_pid_list(pid_list);
+
+	if ((type & TRACE_NO_PIDS) && no_pid_list)
+		trace_free_pid_list(no_pid_list);
 }
 
 void ftrace_clear_pids(struct trace_array *tr)
 {
 	mutex_lock(&ftrace_lock);
 
-	clear_ftrace_pids(tr);
+	clear_ftrace_pids(tr, TRACE_PIDS | TRACE_NO_PIDS);
 
 	mutex_unlock(&ftrace_lock);
 }
 
-static void ftrace_pid_reset(struct trace_array *tr)
+static void ftrace_pid_reset(struct trace_array *tr, int type)
 {
 	mutex_lock(&ftrace_lock);
-	clear_ftrace_pids(tr);
+	clear_ftrace_pids(tr, type);
 
 	ftrace_update_pid_func();
 	ftrace_startup_all(0);
@@ -7078,9 +7108,45 @@ static const struct seq_operations ftrace_pid_sops = {
 	.show = fpid_show,
 };
 
-static int
-ftrace_pid_open(struct inode *inode, struct file *file)
+static void *fnpid_start(struct seq_file *m, loff_t *pos)
+	__acquires(RCU)
+{
+	struct trace_pid_list *pid_list;
+	struct trace_array *tr = m->private;
+
+	mutex_lock(&ftrace_lock);
+	rcu_read_lock_sched();
+
+	pid_list = rcu_dereference_sched(tr->function_no_pids);
+
+	if (!pid_list)
+		return !(*pos) ? FTRACE_NO_PIDS : NULL;
+
+	return trace_pid_start(pid_list, pos);
+}
+
+static void *fnpid_next(struct seq_file *m, void *v, loff_t *pos)
 {
+	struct trace_array *tr = m->private;
+	struct trace_pid_list *pid_list = rcu_dereference_sched(tr->function_no_pids);
+
+	if (v == FTRACE_NO_PIDS) {
+		(*pos)++;
+		return NULL;
+	}
+	return trace_pid_next(pid_list, v, pos);
+}
+
+static const struct seq_operations ftrace_no_pid_sops = {
+	.start = fnpid_start,
+	.next = fnpid_next,
+	.stop = fpid_stop,
+	.show = fpid_show,
+};
+
+static int pid_open(struct inode *inode, struct file *file, int type)
+{
+	const struct seq_operations *seq_ops;
 	struct trace_array *tr = inode->i_private;
 	struct seq_file *m;
 	int ret = 0;
@@ -7091,9 +7157,18 @@ ftrace_pid_open(struct inode *inode, struct file *file)
 
 	if ((file->f_mode & FMODE_WRITE) &&
 	    (file->f_flags & O_TRUNC))
-		ftrace_pid_reset(tr);
+		ftrace_pid_reset(tr, type);
+
+	switch (type) {
+	case TRACE_PIDS:
+		seq_ops = &ftrace_pid_sops;
+		break;
+	case TRACE_NO_PIDS:
+		seq_ops = &ftrace_no_pid_sops;
+		break;
+	}
 
-	ret = seq_open(file, &ftrace_pid_sops);
+	ret = seq_open(file, seq_ops);
 	if (ret < 0) {
 		trace_array_put(tr);
 	} else {
@@ -7105,10 +7180,23 @@ ftrace_pid_open(struct inode *inode, struct file *file)
 	return ret;
 }
 
+static int
+ftrace_pid_open(struct inode *inode, struct file *file)
+{
+	return pid_open(inode, file, TRACE_PIDS);
+}
+
+static int
+ftrace_no_pid_open(struct inode *inode, struct file *file)
+{
+	return pid_open(inode, file, TRACE_NO_PIDS);
+}
+
 static void ignore_task_cpu(void *data)
 {
 	struct trace_array *tr = data;
 	struct trace_pid_list *pid_list;
+	struct trace_pid_list *no_pid_list;
 
 	/*
 	 * This function is called by on_each_cpu() while the
@@ -7116,8 +7204,10 @@ static void ignore_task_cpu(void *data)
 	 */
 	pid_list = rcu_dereference_protected(tr->function_pids,
 					     mutex_is_locked(&ftrace_lock));
+	no_pid_list = rcu_dereference_protected(tr->function_no_pids,
+						mutex_is_locked(&ftrace_lock));
 
-	if (trace_ignore_this_task(pid_list, current))
+	if (trace_ignore_this_task(pid_list, no_pid_list, current))
 		this_cpu_write(tr->array_buffer.data->ftrace_ignore_pid,
 			       FTRACE_PID_IGNORE);
 	else
@@ -7126,12 +7216,13 @@ static void ignore_task_cpu(void *data)
 }
 
 static ssize_t
-ftrace_pid_write(struct file *filp, const char __user *ubuf,
-		   size_t cnt, loff_t *ppos)
+pid_write(struct file *filp, const char __user *ubuf,
+	  size_t cnt, loff_t *ppos, int type)
 {
 	struct seq_file *m = filp->private_data;
 	struct trace_array *tr = m->private;
-	struct trace_pid_list *filtered_pids = NULL;
+	struct trace_pid_list *filtered_pids;
+	struct trace_pid_list *other_pids;
 	struct trace_pid_list *pid_list;
 	ssize_t ret;
 
@@ -7140,19 +7231,39 @@ ftrace_pid_write(struct file *filp, const char __user *ubuf,
 
 	mutex_lock(&ftrace_lock);
 
-	filtered_pids = rcu_dereference_protected(tr->function_pids,
+	switch (type) {
+	case TRACE_PIDS:
+		filtered_pids = rcu_dereference_protected(tr->function_pids,
 					     lockdep_is_held(&ftrace_lock));
+		other_pids = rcu_dereference_protected(tr->function_no_pids,
+					     lockdep_is_held(&ftrace_lock));
+		break;
+	case TRACE_NO_PIDS:
+		filtered_pids = rcu_dereference_protected(tr->function_no_pids,
+					     lockdep_is_held(&ftrace_lock));
+		other_pids = rcu_dereference_protected(tr->function_pids,
+					     lockdep_is_held(&ftrace_lock));
+		break;
+	}
 
 	ret = trace_pid_write(filtered_pids, &pid_list, ubuf, cnt);
 	if (ret < 0)
 		goto out;
 
-	rcu_assign_pointer(tr->function_pids, pid_list);
+	switch (type) {
+	case TRACE_PIDS:
+		rcu_assign_pointer(tr->function_pids, pid_list);
+		break;
+	case TRACE_NO_PIDS:
+		rcu_assign_pointer(tr->function_no_pids, pid_list);
+		break;
+	}
+
 
 	if (filtered_pids) {
 		synchronize_rcu();
 		trace_free_pid_list(filtered_pids);
-	} else if (pid_list) {
+	} else if (pid_list && !other_pids) {
 		/* Register a probe to set whether to ignore the tracing of a task */
 		register_trace_sched_switch(ftrace_filter_pid_sched_switch_probe, tr);
 	}
@@ -7175,6 +7286,20 @@ ftrace_pid_write(struct file *filp, const char __user *ubuf,
 	return ret;
 }
 
+static ssize_t
+ftrace_pid_write(struct file *filp, const char __user *ubuf,
+		 size_t cnt, loff_t *ppos)
+{
+	return pid_write(filp, ubuf, cnt, ppos, TRACE_PIDS);
+}
+
+static ssize_t
+ftrace_no_pid_write(struct file *filp, const char __user *ubuf,
+		    size_t cnt, loff_t *ppos)
+{
+	return pid_write(filp, ubuf, cnt, ppos, TRACE_NO_PIDS);
+}
+
 static int
 ftrace_pid_release(struct inode *inode, struct file *file)
 {
@@ -7193,10 +7318,20 @@ static const struct file_operations ftrace_pid_fops = {
 	.release	= ftrace_pid_release,
 };
 
+static const struct file_operations ftrace_no_pid_fops = {
+	.open		= ftrace_no_pid_open,
+	.write		= ftrace_no_pid_write,
+	.read		= seq_read,
+	.llseek		= tracing_lseek,
+	.release	= ftrace_pid_release,
+};
+
 void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer)
 {
 	trace_create_file("set_ftrace_pid", 0644, d_tracer,
 			    tr, &ftrace_pid_fops);
+	trace_create_file("set_ftrace_notrace_pid", 0644, d_tracer,
+			    tr, &ftrace_no_pid_fops);
 }
 
 void __init ftrace_init_tracefs_toplevel(struct trace_array *tr,