rcu-string.h (997B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * Copyright (C) 2012 Red Hat. All rights reserved. 4 */ 5 6#ifndef BTRFS_RCU_STRING_H 7#define BTRFS_RCU_STRING_H 8 9struct rcu_string { 10 struct rcu_head rcu; 11 char str[]; 12}; 13 14static inline struct rcu_string *rcu_string_strdup(const char *src, gfp_t mask) 15{ 16 size_t len = strlen(src) + 1; 17 struct rcu_string *ret = kzalloc(sizeof(struct rcu_string) + 18 (len * sizeof(char)), mask); 19 if (!ret) 20 return ret; 21 strncpy(ret->str, src, len); 22 return ret; 23} 24 25static inline void rcu_string_free(struct rcu_string *str) 26{ 27 if (str) 28 kfree_rcu(str, rcu); 29} 30 31#define printk_in_rcu(fmt, ...) do { \ 32 rcu_read_lock(); \ 33 printk(fmt, __VA_ARGS__); \ 34 rcu_read_unlock(); \ 35} while (0) 36 37#define printk_ratelimited_in_rcu(fmt, ...) do { \ 38 rcu_read_lock(); \ 39 printk_ratelimited(fmt, __VA_ARGS__); \ 40 rcu_read_unlock(); \ 41} while (0) 42 43#define rcu_str_deref(rcu_str) ({ \ 44 struct rcu_string *__str = rcu_dereference(rcu_str); \ 45 __str->str; \ 46}) 47 48#endif