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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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C
12345678910111213141516171819202122232425262728293031323334353637/* 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) && unlikely(!__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 */