linux-stable/include/linux/clocksource_ids.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_CLOCKSOURCE_IDS_H
#define _LINUX_CLOCKSOURCE_IDS_H

/* Enum to give clocksources a unique identifier */
enum clocksource_ids {
	CSID_GENERIC		= 0,
	CSID_MAX,
};

#endif
time: Add mechanism to recognize clocksource in time_get_snapshot System time snapshots are not conveying information about the current clocksource which was used, but callers like the PTP KVM guest implementation have the requirement to evaluate the clocksource type to select the appropriate mechanism. Introduce a clocksource id field in struct clocksource which is by default set to CSID_GENERIC (0). Clocksource implementations can set that field to a value which allows to identify the clocksource. Store the clocksource id of the current clocksource in the system_time_snapshot so callers can evaluate which clocksource was used to take the snapshot and act accordingly. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Jianyong Wu <jianyong.wu@arm.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20201209060932.212364-5-jianyong.wu@arm.com 2020-12-09 06:09:27 +00:00			`/* SPDX-License-Identifier: GPL-2.0 */`
			`#ifndef _LINUX_CLOCKSOURCE_IDS_H`
			`#define _LINUX_CLOCKSOURCE_IDS_H`

			`/* Enum to give clocksources a unique identifier */`
			`enum clocksource_ids {`
			`CSID_GENERIC = 0,`
			`CSID_MAX,`
			`};`

			`#endif`