[mirror_ubuntu-jammy-kernel.git] / include / linux / once_lite.h

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

#include <linux/types.h>

/* Call a function once. Similar to DO_ONCE(), but does not use jump label
 * patching via static keys.
 */
#define DO_ONCE_LITE(func, ...)						\
	DO_ONCE_LITE_IF(true, func, ##__VA_ARGS__)
#define DO_ONCE_LITE_IF(condition, func, ...)				\
	({								\
		static bool __section(".data.once") __already_done;	\
		bool __ret_do_once = !!(condition);			\
									\
		if (unlikely(__ret_do_once && !__already_done)) {	\
			__already_done = true;				\
			func(__VA_ARGS__);				\
		}							\
		unlikely(__ret_do_once);				\
	})

#endif /* _LINUX_ONCE_LITE_H */
Commit	Line	Data
a358f406 TL	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	#ifndef _LINUX_ONCE_LITE_H
	3	#define _LINUX_ONCE_LITE_H
	4
	5	#include <linux/types.h>
	6
	7	/* Call a function once. Similar to DO_ONCE(), but does not use jump label
	8	* patching via static keys.
	9	*/
	10	#define DO_ONCE_LITE(func, ...) \
	11	DO_ONCE_LITE_IF(true, func, ##__VA_ARGS__)
	12	#define DO_ONCE_LITE_IF(condition, func, ...) \
	13	({ \
	14	static bool __section(".data.once") __already_done; \
	15	bool __ret_do_once = !!(condition); \
	16	\
	17	if (unlikely(__ret_do_once && !__already_done)) { \
	18	__already_done = true; \
	19	func(__VA_ARGS__); \
	20	} \
	21	unlikely(__ret_do_once); \
	22	})
	23
	24	#endif /* _LINUX_ONCE_LITE_H */