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/* 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 */