| Josef Bacik | 606686e | 2012-06-04 14:03:51 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 Red Hat. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public |
| 6 | * License v2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public |
| 14 | * License along with this program; if not, write to the |
| 15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 16 | * Boston, MA 021110-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | struct rcu_string { |
| 20 | struct rcu_head rcu; |
| 21 | char str[0]; |
| 22 | }; |
| 23 | |
| 24 | static inline struct rcu_string *rcu_string_strdup(const char *src, gfp_t mask) |
| 25 | { |
| 26 | size_t len = strlen(src) + 1; |
| 27 | struct rcu_string *ret = kzalloc(sizeof(struct rcu_string) + |
| 28 | (len * sizeof(char)), mask); |
| 29 | if (!ret) |
| 30 | return ret; |
| 31 | strncpy(ret->str, src, len); |
| 32 | return ret; |
| 33 | } |
| 34 | |
| 35 | static inline void rcu_string_free(struct rcu_string *str) |
| 36 | { |
| 37 | if (str) |
| 38 | kfree_rcu(str, rcu); |
| 39 | } |
| 40 | |
| 41 | #define printk_in_rcu(fmt, ...) do { \ |
| 42 | rcu_read_lock(); \ |
| 43 | printk(fmt, __VA_ARGS__); \ |
| 44 | rcu_read_unlock(); \ |
| 45 | } while (0) |
| 46 | |
| 47 | #define printk_ratelimited_in_rcu(fmt, ...) do { \ |
| 48 | rcu_read_lock(); \ |
| 49 | printk_ratelimited(fmt, __VA_ARGS__); \ |
| 50 | rcu_read_unlock(); \ |
| 51 | } while (0) |
| 52 | |
| 53 | #define rcu_str_deref(rcu_str) ({ \ |
| 54 | struct rcu_string *__str = rcu_dereference(rcu_str); \ |
| 55 | __str->str; \ |
| 56 | }) |