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)
 8void __init printk_sysctl_init(void);
 9int 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. */
18enum 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)
24int 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
31bool 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
45void defer_console_output(void);
46
47u16 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
59static inline bool printk_percpu_data_ready(void) { return false; }
60#endif /* CONFIG_PRINTK */