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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 | ||
19 | typedef __printf(1, 0) int (*printk_func_t)(const char *fmt, va_list args); | |
20 | ||
21 | int __printf(1, 0) vprintk_default(const char *fmt, va_list args); | |
22 | ||
23 | #ifdef CONFIG_PRINTK_NMI | |
24 | ||
25 | /* | |
26 | * printk() could not take logbuf_lock in NMI context. Instead, | |
27 | * it temporary stores the strings into a per-CPU buffer. | |
28 | * The alternative implementation is chosen transparently | |
29 | * via per-CPU variable. | |
30 | */ | |
31 | DECLARE_PER_CPU(printk_func_t, printk_func); | |
32 | static inline __printf(1, 0) int vprintk_func(const char *fmt, va_list args) | |
33 | { | |
34 | return this_cpu_read(printk_func)(fmt, args); | |
35 | } | |
36 | ||
37 | #else /* CONFIG_PRINTK_NMI */ | |
38 | ||
39 | static inline __printf(1, 0) int vprintk_func(const char *fmt, va_list args) | |
40 | { | |
41 | return vprintk_default(fmt, args); | |
42 | } | |
43 | ||
44 | #endif /* CONFIG_PRINTK_NMI */ |