1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * internal.h - printk internal definitions
4 */
5 #include <linux/percpu.h>
6
7 #ifdef CONFIG_PRINTK
8
9 #define PRINTK_SAFE_CONTEXT_MASK 0x3fffffff
10 #define PRINTK_NMI_DIRECT_CONTEXT_MASK 0x40000000
11 #define PRINTK_NMI_CONTEXT_MASK 0x80000000
12
13 extern raw_spinlock_t logbuf_lock;
14
15 __printf(5, 0)
16 int vprintk_store(int facility, int level,
17 const char *dict, size_t dictlen,
18 const char *fmt, va_list args);
19
20 __printf(1, 0) int vprintk_default(const char *fmt, va_list args);
21 __printf(1, 0) int vprintk_deferred(const char *fmt, va_list args);
22 __printf(1, 0) int vprintk_func(const char *fmt, va_list args);
23 void __printk_safe_enter(void);
24 void __printk_safe_exit(void);
25
26 #define printk_safe_enter_irqsave(flags) \
27 do { \
28 local_irq_save(flags); \
29 __printk_safe_enter(); \
30 } while (0)
31
32 #define printk_safe_exit_irqrestore(flags) \
33 do { \
34 __printk_safe_exit(); \
35 local_irq_restore(flags); \
36 } while (0)
37
38 #define printk_safe_enter_irq() \
39 do { \
40 local_irq_disable(); \
41 __printk_safe_enter(); \
42 } while (0)
43
44 #define printk_safe_exit_irq() \
45 do { \
46 __printk_safe_exit(); \
47 local_irq_enable(); \
48 } while (0)
49
50 void defer_console_output(void);
51
52 #else
53
vprintk_func(const char * fmt,va_list args)54 __printf(1, 0) int vprintk_func(const char *fmt, va_list args) { return 0; }
55
56 /*
57 * In !PRINTK builds we still export logbuf_lock spin_lock, console_sem
58 * semaphore and some of console functions (console_unlock()/etc.), so
59 * printk-safe must preserve the existing local IRQ guarantees.
60 */
61 #define printk_safe_enter_irqsave(flags) local_irq_save(flags)
62 #define printk_safe_exit_irqrestore(flags) local_irq_restore(flags)
63
64 #define printk_safe_enter_irq() local_irq_disable()
65 #define printk_safe_exit_irq() local_irq_enable()
66
67 #endif /* CONFIG_PRINTK */
68