swh:1:snp:c3bf2749e3476071fa748f67b0ffa2fdc5fe49d9
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Tip revision: d1221cea11fca0f6946bdd032a45b22cecfc0f99 authored by Linus Torvalds on 13 September 2022, 13:11:38 UTC
Merge tag 'pull-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Tip revision: d1221ce
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 __ONCE_LITE_IF(condition)					\
	({								\
		static bool __section(".data.once") __already_done;	\
		bool __ret_cond = !!(condition);			\
		bool __ret_once = false;				\
									\
		if (unlikely(__ret_cond && !__already_done)) {		\
			__already_done = true;				\
			__ret_once = true;				\
		}							\
		unlikely(__ret_once);					\
	})

#define DO_ONCE_LITE_IF(condition, func, ...)				\
	({								\
		bool __ret_do_once = !!(condition);			\
									\
		if (__ONCE_LITE_IF(__ret_do_once))			\
			func(__VA_ARGS__);				\
									\
		unlikely(__ret_do_once);				\
	})

#endif /* _LINUX_ONCE_LITE_H */
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