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42a0bb3f PM |
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 | ||
874f9c7d JP |
19 | typedef __printf(2, 0) int (*printk_func_t)(int level, const char *fmt, |
20 | va_list args); | |
42a0bb3f | 21 | |
874f9c7d JP |
22 | __printf(2, 0) |
23 | int vprintk_default(int level, const char *fmt, va_list args); | |
42a0bb3f PM |
24 | |
25 | #ifdef CONFIG_PRINTK_NMI | |
26 | ||
cf9b1106 PM |
27 | extern raw_spinlock_t logbuf_lock; |
28 | ||
42a0bb3f PM |
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); | |
874f9c7d JP |
36 | __printf(2, 0) |
37 | static inline int vprintk_func(int level, const char *fmt, va_list args) | |
42a0bb3f | 38 | { |
874f9c7d | 39 | return this_cpu_read(printk_func)(level, fmt, args); |
42a0bb3f PM |
40 | } |
41 | ||
b522deab PM |
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 | ||
42a0bb3f PM |
48 | #else /* CONFIG_PRINTK_NMI */ |
49 | ||
874f9c7d JP |
50 | __printf(2, 0) |
51 | static inline int vprintk_func(int level, const char *fmt, va_list args) | |
42a0bb3f | 52 | { |
874f9c7d | 53 | return vprintk_default(level, fmt, args); |
42a0bb3f PM |
54 | } |
55 | ||
b522deab PM |
56 | static inline int get_nmi_message_lost(void) |
57 | { | |
58 | return 0; | |
59 | } | |
60 | ||
42a0bb3f | 61 | #endif /* CONFIG_PRINTK_NMI */ |