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 */

 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
13extern raw_spinlock_t logbuf_lock;
14
15__printf(5, 0)
16int 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);
23void __printk_safe_enter(void);
24void __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
50void defer_console_output(void);
51
 
 
52#else
53
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 */