1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * internal.h - printk internal definitions
4 */
5 #include <linux/percpu.h>
6
7 #if defined(CONFIG_PRINTK) && defined(CONFIG_SYSCTL)
8 void __init printk_sysctl_init(void);
9 int devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write,
10 void *buffer, size_t *lenp, loff_t *ppos);
11 #else
12 #define printk_sysctl_init() do { } while (0)
13 #endif
14
15 #ifdef CONFIG_PRINTK
16
17 /* Flags for a single printk record. */
18 enum printk_info_flags {
19 LOG_NEWLINE = 2, /* text ended with a newline */
20 LOG_CONT = 8, /* text is a fragment of a continuation line */
21 };
22
23 __printf(4, 0)
24 int vprintk_store(int facility, int level,
25 const struct dev_printk_info *dev_info,
26 const char *fmt, va_list args);
27
28 __printf(1, 0) int vprintk_default(const char *fmt, va_list args);
29 __printf(1, 0) int vprintk_deferred(const char *fmt, va_list args);
30
31 bool printk_percpu_data_ready(void);
32
33 #define printk_safe_enter_irqsave(flags) \
34 do { \
35 local_irq_save(flags); \
36 __printk_safe_enter(); \
37 } while (0)
38
39 #define printk_safe_exit_irqrestore(flags) \
40 do { \
41 __printk_safe_exit(); \
42 local_irq_restore(flags); \
43 } while (0)
44
45 void defer_console_output(void);
46
47 u16 printk_parse_prefix(const char *text, int *level,
48 enum printk_info_flags *flags);
49 #else
50
51 /*
52 * In !PRINTK builds we still export console_sem
53 * semaphore and some of console functions (console_unlock()/etc.), so
54 * printk-safe must preserve the existing local IRQ guarantees.
55 */
56 #define printk_safe_enter_irqsave(flags) local_irq_save(flags)
57 #define printk_safe_exit_irqrestore(flags) local_irq_restore(flags)
58
printk_percpu_data_ready(void)59 static inline bool printk_percpu_data_ready(void) { return false; }
60 #endif /* CONFIG_PRINTK */
61