linux-imx

/* SPDX-License-Identifier: GPL-2.0 */

/*

 * Copyright (C) 2012 Red Hat.  All rights reserved.

 */

​

#ifndef BTRFS_RCU_STRING_H

#define BTRFS_RCU_STRING_H

​

struct rcu_string {

    struct rcu_head rcu;

    char str[0];

};

​

static inline struct rcu_string *rcu_string_strdup(const char *src, gfp_t mask)

{

    size_t len = strlen(src) + 1;

    struct rcu_string *ret = kzalloc(sizeof(struct rcu_string) +

                     (len * sizeof(char)), mask);

    if (!ret)

        return ret;

    strncpy(ret->str, src, len);

    return ret;

}

​

static inline void rcu_string_free(struct rcu_string *str)

{

    if (str)

        kfree_rcu(str, rcu);

}

​

#define printk_in_rcu(fmt, ...) do {    \

    rcu_read_lock();        \

    printk(fmt, __VA_ARGS__);   \

    rcu_read_unlock();      \

} while (0)

​

#define printk_ratelimited_in_rcu(fmt, ...) do {    \

    rcu_read_lock();                \

    printk_ratelimited(fmt, __VA_ARGS__);       \

    rcu_read_unlock();              \

} while (0)

​

#define rcu_str_deref(rcu_str) ({               \

    struct rcu_string *__str = rcu_dereference(rcu_str);    \

    __str->str;                     \

})

​

#endif