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Petr Mladek42a0bb32016-05-20 17:00:33 -07001/*
2 * internal.h - printk internal definitions
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
16 */
17#include <linux/percpu.h>
18
Joe Perches874f9c72016-08-02 14:03:53 -070019typedef __printf(2, 0) int (*printk_func_t)(int level, const char *fmt,
20 va_list args);
Petr Mladek42a0bb32016-05-20 17:00:33 -070021
Joe Perches874f9c72016-08-02 14:03:53 -070022__printf(2, 0)
23int vprintk_default(int level, const char *fmt, va_list args);
Petr Mladek42a0bb32016-05-20 17:00:33 -070024
25#ifdef CONFIG_PRINTK_NMI
26
Petr Mladekcf9b1102016-05-20 17:00:42 -070027extern raw_spinlock_t logbuf_lock;
28
Petr Mladek42a0bb32016-05-20 17:00:33 -070029/*
30 * printk() could not take logbuf_lock in NMI context. Instead,
31 * it temporary stores the strings into a per-CPU buffer.
32 * The alternative implementation is chosen transparently
33 * via per-CPU variable.
34 */
35DECLARE_PER_CPU(printk_func_t, printk_func);
Joe Perches874f9c72016-08-02 14:03:53 -070036__printf(2, 0)
37static inline int vprintk_func(int level, const char *fmt, va_list args)
Petr Mladek42a0bb32016-05-20 17:00:33 -070038{
Joe Perches874f9c72016-08-02 14:03:53 -070039 return this_cpu_read(printk_func)(level, fmt, args);
Petr Mladek42a0bb32016-05-20 17:00:33 -070040}
41
Petr Mladekb522dea2016-05-20 17:00:36 -070042extern atomic_t nmi_message_lost;
43static inline int get_nmi_message_lost(void)
44{
45 return atomic_xchg(&nmi_message_lost, 0);
46}
47
Petr Mladek42a0bb32016-05-20 17:00:33 -070048#else /* CONFIG_PRINTK_NMI */
49
Joe Perches874f9c72016-08-02 14:03:53 -070050__printf(2, 0)
51static inline int vprintk_func(int level, const char *fmt, va_list args)
Petr Mladek42a0bb32016-05-20 17:00:33 -070052{
Joe Perches874f9c72016-08-02 14:03:53 -070053 return vprintk_default(level, fmt, args);
Petr Mladek42a0bb32016-05-20 17:00:33 -070054}
55
Petr Mladekb522dea2016-05-20 17:00:36 -070056static inline int get_nmi_message_lost(void)
57{
58 return 0;
59}
60
Petr Mladek42a0bb32016-05-20 17:00:33 -070061#endif /* CONFIG_PRINTK_NMI */