Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Copyright (C) 2012 Red Hat.  All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #ifndef BTRFS_RCU_STRING_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #define BTRFS_RCU_STRING_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) struct rcu_string {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 	struct rcu_head rcu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 	char str[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) static inline struct rcu_string *rcu_string_strdup(const char *src, gfp_t mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 	size_t len = strlen(src) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	struct rcu_string *ret = kzalloc(sizeof(struct rcu_string) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 					 (len * sizeof(char)), mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	strncpy(ret->str, src, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static inline void rcu_string_free(struct rcu_string *str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	if (str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 		kfree_rcu(str, rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define printk_in_rcu(fmt, ...) do {	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	rcu_read_lock();		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	printk(fmt, __VA_ARGS__);	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	rcu_read_unlock();		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #define printk_ratelimited_in_rcu(fmt, ...) do {	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	rcu_read_lock();				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	printk_ratelimited(fmt, __VA_ARGS__);		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	rcu_read_unlock();				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #define rcu_str_deref(rcu_str) ({				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	struct rcu_string *__str = rcu_dereference(rcu_str);	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	__str->str;						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #endif