[lttng-modules.git] / wrapper / timer.h

/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
 *
 * wrapper/timer.h
 *
 * wrapper around linux/timer.h.
 *
 * Copyright (C) 2016 Michael Jeanson <mjeanson@efficios.com>
 */

#ifndef _LTTNG_WRAPPER_TIMER_H
#define _LTTNG_WRAPPER_TIMER_H

#include <linux/version.h>
#include <linux/timer.h>
#include <lttng-kernel-version.h>

/*
 * In the olden days, pinned timers were initialized normaly with init_timer()
 * and then modified with mod_timer_pinned().
 *
 * Then came kernel 4.8.0 and they had to be initilized as pinned with
 * init_timer_pinned() and then modified as regular timers with mod_timer().
 *
 * Then came kernel 4.15.0 with a new timer API where init_timer() is no more.
 * It's replaced by timer_setup() where pinned is now part of timer flags.
 */


#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,15,0))

#define LTTNG_TIMER_PINNED		TIMER_PINNED
#define LTTNG_TIMER_FUNC_ARG_TYPE	struct timer_list *

#define lttng_mod_timer_pinned(timer, expires) \
	mod_timer(timer, expires)

#define lttng_from_timer(var, callback_timer, timer_fieldname) \
	from_timer(var, callback_timer, timer_fieldname)

#define lttng_timer_setup(timer, callback, flags, unused) \
	timer_setup(timer, callback, flags)


#else /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,15,0) */


# if (LTTNG_RT_VERSION_CODE >= LTTNG_RT_KERNEL_VERSION(4,6,4,8) \
	|| LINUX_VERSION_CODE >= KERNEL_VERSION(4,8,0))

#define lttng_init_timer_pinned(timer) \
	init_timer_pinned(timer)

#define lttng_mod_timer_pinned(timer, expires) \
	mod_timer(timer, expires)

# else /* LTTNG_RT_VERSION_CODE >= LTTNG_RT_KERNEL_VERSION(4,6,4,8) */

#define lttng_init_timer_pinned(timer) \
	init_timer(timer)

#define lttng_mod_timer_pinned(timer, expires) \
	mod_timer_pinned(timer, expires)

# endif /* LTTNG_RT_VERSION_CODE >= LTTNG_RT_KERNEL_VERSION(4,6,4,8) */


#define LTTNG_TIMER_PINNED		TIMER_PINNED
#define LTTNG_TIMER_FUNC_ARG_TYPE	unsigned long

/* timer_fieldname is unused prior to 4.15. */
#define lttng_from_timer(var, timer_data, timer_fieldname) \
	((typeof(var))timer_data)

static inline void lttng_timer_setup(struct timer_list *timer,
		void (*function)(LTTNG_TIMER_FUNC_ARG_TYPE),
		unsigned int flags, void *data)
{
	if (flags & LTTNG_TIMER_PINNED)
		lttng_init_timer_pinned(timer);
	else
		init_timer(timer);

	timer->function = function;
	timer->data = (unsigned long)data;
}

#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,15,0) */

#endif /* _LTTNG_WRAPPER_TIMER_H */
Commit	Line	Data
	1	/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
	2	*
	3	* wrapper/timer.h
	4	*
	5	* wrapper around linux/timer.h.
	6	*
	7	* Copyright (C) 2016 Michael Jeanson <mjeanson@efficios.com>
	8	*/
	9
	10	#ifndef _LTTNG_WRAPPER_TIMER_H
	11	#define _LTTNG_WRAPPER_TIMER_H
	12
	13	#include <linux/version.h>
	14	#include <linux/timer.h>
	15	#include <lttng-kernel-version.h>
	16
	17	/*
	18	* In the olden days, pinned timers were initialized normaly with init_timer()
	19	* and then modified with mod_timer_pinned().
	20	*
	21	* Then came kernel 4.8.0 and they had to be initilized as pinned with
	22	* init_timer_pinned() and then modified as regular timers with mod_timer().
	23	*
	24	* Then came kernel 4.15.0 with a new timer API where init_timer() is no more.
	25	* It's replaced by timer_setup() where pinned is now part of timer flags.
	26	*/
	27
	28
	29	#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,15,0))
	30
	31	#define LTTNG_TIMER_PINNED TIMER_PINNED
	32	#define LTTNG_TIMER_FUNC_ARG_TYPE struct timer_list *
	33
	34	#define lttng_mod_timer_pinned(timer, expires) \
	35	mod_timer(timer, expires)
	36
	37	#define lttng_from_timer(var, callback_timer, timer_fieldname) \
	38	from_timer(var, callback_timer, timer_fieldname)
	39
	40	#define lttng_timer_setup(timer, callback, flags, unused) \
	41	timer_setup(timer, callback, flags)
	42
	43
	44	#else /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,15,0) */
	45
	46
	47	# if (LTTNG_RT_VERSION_CODE >= LTTNG_RT_KERNEL_VERSION(4,6,4,8) \
	48	\|\| LINUX_VERSION_CODE >= KERNEL_VERSION(4,8,0))
	49
	50	#define lttng_init_timer_pinned(timer) \
	51	init_timer_pinned(timer)
	52
	53	#define lttng_mod_timer_pinned(timer, expires) \
	54	mod_timer(timer, expires)
	55
	56	# else /* LTTNG_RT_VERSION_CODE >= LTTNG_RT_KERNEL_VERSION(4,6,4,8) */
	57
	58	#define lttng_init_timer_pinned(timer) \
	59	init_timer(timer)
	60
	61	#define lttng_mod_timer_pinned(timer, expires) \
	62	mod_timer_pinned(timer, expires)
	63
	64	# endif /* LTTNG_RT_VERSION_CODE >= LTTNG_RT_KERNEL_VERSION(4,6,4,8) */
	65
	66
	67	#define LTTNG_TIMER_PINNED TIMER_PINNED
	68	#define LTTNG_TIMER_FUNC_ARG_TYPE unsigned long
	69
	70	/* timer_fieldname is unused prior to 4.15. */
	71	#define lttng_from_timer(var, timer_data, timer_fieldname) \
	72	((typeof(var))timer_data)
	73
	74	static inline void lttng_timer_setup(struct timer_list *timer,
	75	void (*function)(LTTNG_TIMER_FUNC_ARG_TYPE),
	76	unsigned int flags, void *data)
	77	{
	78	if (flags & LTTNG_TIMER_PINNED)
	79	lttng_init_timer_pinned(timer);
	80	else
	81	init_timer(timer);
	82
	83	timer->function = function;
	84	timer->data = (unsigned long)data;
	85	}
	86
	87	#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,15,0) */
	88
	89	#endif /* _LTTNG_WRAPPER_TIMER_H */