linux-stable/kernel/trace/pid_list.h

// SPDX-License-Identifier: GPL-2.0

/* Do not include this file directly. */

#ifndef _TRACE_INTERNAL_PID_LIST_H
#define _TRACE_INTERNAL_PID_LIST_H

struct trace_pid_list {
	int			pid_max;
	unsigned long		*pids;
};

#endif /* _TRACE_INTERNAL_PID_LIST_H */
tracing: Place trace_pid_list logic into abstract functions [ Upstream commit 6954e415264eeb5ee6be0d22d789ad12c995ee64 ] Instead of having the logic that does trace_pid_list open coded, wrap it in abstract functions. This will allow a rewrite of the logic that implements the trace_pid_list without affecting the users. Note, this causes a change in behavior. Every time a pid is written into the set_*_pid file, it creates a new list and uses RCU to update it. If pid_max is lowered, but there was a pid currently in the list that was higher than pid_max, those pids will now be removed on updating the list. The old behavior kept that from happening. The rewrite of the pid_list logic will no longer depend on pid_max, and will return the old behavior. Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: Sasha Levin <sashal@kernel.org> 2021-09-23 21:03:49 -04:00			`// SPDX-License-Identifier: GPL-2.0`

			`/* Do not include this file directly. */`

			`#ifndef _TRACE_INTERNAL_PID_LIST_H`
			`#define _TRACE_INTERNAL_PID_LIST_H`

			`struct trace_pid_list {`
			`int pid_max;`
			`unsigned long *pids;`
			`};`

			`#endif /* _TRACE_INTERNAL_PID_LIST_H */`