Petr Mladek | 42a0bb3 | 2016-05-20 17:00:33 -0700 | [diff] [blame] | 1 | /* |
| 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 Perches | 874f9c7 | 2016-08-02 14:03:53 -0700 | [diff] [blame] | 19 | typedef __printf(2, 0) int (*printk_func_t)(int level, const char *fmt, |
| 20 | va_list args); |
Petr Mladek | 42a0bb3 | 2016-05-20 17:00:33 -0700 | [diff] [blame] | 21 | |
Joe Perches | 874f9c7 | 2016-08-02 14:03:53 -0700 | [diff] [blame] | 22 | __printf(2, 0) |
| 23 | int vprintk_default(int level, const char *fmt, va_list args); |
Petr Mladek | 42a0bb3 | 2016-05-20 17:00:33 -0700 | [diff] [blame] | 24 | |
| 25 | #ifdef CONFIG_PRINTK_NMI |
| 26 | |
Petr Mladek | cf9b110 | 2016-05-20 17:00:42 -0700 | [diff] [blame] | 27 | extern raw_spinlock_t logbuf_lock; |
| 28 | |
Petr Mladek | 42a0bb3 | 2016-05-20 17:00:33 -0700 | [diff] [blame] | 29 | /* |
| 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 | */ |
| 35 | DECLARE_PER_CPU(printk_func_t, printk_func); |
Joe Perches | 874f9c7 | 2016-08-02 14:03:53 -0700 | [diff] [blame] | 36 | __printf(2, 0) |
| 37 | static inline int vprintk_func(int level, const char *fmt, va_list args) |
Petr Mladek | 42a0bb3 | 2016-05-20 17:00:33 -0700 | [diff] [blame] | 38 | { |
Joe Perches | 874f9c7 | 2016-08-02 14:03:53 -0700 | [diff] [blame] | 39 | return this_cpu_read(printk_func)(level, fmt, args); |
Petr Mladek | 42a0bb3 | 2016-05-20 17:00:33 -0700 | [diff] [blame] | 40 | } |
| 41 | |
Petr Mladek | b522dea | 2016-05-20 17:00:36 -0700 | [diff] [blame] | 42 | extern atomic_t nmi_message_lost; |
| 43 | static inline int get_nmi_message_lost(void) |
| 44 | { |
| 45 | return atomic_xchg(&nmi_message_lost, 0); |
| 46 | } |
| 47 | |
Petr Mladek | 42a0bb3 | 2016-05-20 17:00:33 -0700 | [diff] [blame] | 48 | #else /* CONFIG_PRINTK_NMI */ |
| 49 | |
Joe Perches | 874f9c7 | 2016-08-02 14:03:53 -0700 | [diff] [blame] | 50 | __printf(2, 0) |
| 51 | static inline int vprintk_func(int level, const char *fmt, va_list args) |
Petr Mladek | 42a0bb3 | 2016-05-20 17:00:33 -0700 | [diff] [blame] | 52 | { |
Joe Perches | 874f9c7 | 2016-08-02 14:03:53 -0700 | [diff] [blame] | 53 | return vprintk_default(level, fmt, args); |
Petr Mladek | 42a0bb3 | 2016-05-20 17:00:33 -0700 | [diff] [blame] | 54 | } |
| 55 | |
Petr Mladek | b522dea | 2016-05-20 17:00:36 -0700 | [diff] [blame] | 56 | static inline int get_nmi_message_lost(void) |
| 57 | { |
| 58 | return 0; |
| 59 | } |
| 60 | |
Petr Mladek | 42a0bb3 | 2016-05-20 17:00:33 -0700 | [diff] [blame] | 61 | #endif /* CONFIG_PRINTK_NMI */ |