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 #ifdef CONFIG_PRINTK
20
21 #define PRINTK_SAFE_CONTEXT_MASK 0x3fffffff
22 #define PRINTK_NMI_DIRECT_CONTEXT_MASK 0x40000000
23 #define PRINTK_NMI_CONTEXT_MASK 0x80000000
24
25 extern raw_spinlock_t logbuf_lock;
26
27 __printf(5, 0)
28 int vprintk_store(int facility, int level,
29 const char *dict, size_t dictlen,
30 const char *fmt, va_list args);
31
32 __printf(1, 0) int vprintk_default(const char *fmt, va_list args);
33 __printf(1, 0) int vprintk_deferred(const char *fmt, va_list args);
34 __printf(1, 0) int vprintk_func(const char *fmt, va_list args);
35 void __printk_safe_enter(void);
36 void __printk_safe_exit(void);
37
38 #define printk_safe_enter_irqsave(flags) \
39 do { \
40 local_irq_save(flags); \
41 __printk_safe_enter(); \
42 } while (0)
43
44 #define printk_safe_exit_irqrestore(flags) \
45 do { \
46 __printk_safe_exit(); \
47 local_irq_restore(flags); \
48 } while (0)
49
50 #define printk_safe_enter_irq() \
51 do { \
52 local_irq_disable(); \
53 __printk_safe_enter(); \
54 } while (0)
55
56 #define printk_safe_exit_irq() \
57 do { \
58 __printk_safe_exit(); \
59 local_irq_enable(); \
60 } while (0)
61
62 void defer_console_output(void);
63
64 #else
65
vprintk_func(const char * fmt,va_list args)66 __printf(1, 0) int vprintk_func(const char *fmt, va_list args) { return 0; }
67
68 /*
69 * In !PRINTK builds we still export logbuf_lock spin_lock, console_sem
70 * semaphore and some of console functions (console_unlock()/etc.), so
71 * printk-safe must preserve the existing local IRQ guarantees.
72 */
73 #define printk_safe_enter_irqsave(flags) local_irq_save(flags)
74 #define printk_safe_exit_irqrestore(flags) local_irq_restore(flags)
75
76 #define printk_safe_enter_irq() local_irq_disable()
77 #define printk_safe_exit_irq() local_irq_enable()
78
79 #endif /* CONFIG_PRINTK */
80
