37 lines
925 B
C
37 lines
925 B
C
|
/* 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 */
|