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 */

 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	0x007ffffff
10#define PRINTK_NMI_DIRECT_CONTEXT_MASK	0x008000000
11#define PRINTK_NMI_CONTEXT_MASK		0xff0000000
12
13#define PRINTK_NMI_CONTEXT_OFFSET	0x010000000
14
15__printf(4, 0)
16int vprintk_store(int facility, int level,
17		  const struct dev_printk_info *dev_info,
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);
 
22void __printk_safe_enter(void);
23void __printk_safe_exit(void);
24
25void printk_safe_init(void);
26bool printk_percpu_data_ready(void);
27
28#define printk_safe_enter_irqsave(flags)	\
29	do {					\
30		local_irq_save(flags);		\
31		__printk_safe_enter();		\
32	} while (0)
33
34#define printk_safe_exit_irqrestore(flags)	\
35	do {					\
36		__printk_safe_exit();		\
37		local_irq_restore(flags);	\
38	} while (0)
39
40#define printk_safe_enter_irq()		\
41	do {					\
42		local_irq_disable();		\
43		__printk_safe_enter();		\
44	} while (0)
45
46#define printk_safe_exit_irq()			\
47	do {					\
48		__printk_safe_exit();		\
49		local_irq_enable();		\
50	} while (0)
51
52void defer_console_output(void);
53
54#else
55
 
 
56/*
57 * In !PRINTK builds we still export 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
67static inline void printk_safe_init(void) { }
68static inline bool printk_percpu_data_ready(void) { return false; }
69#endif /* CONFIG_PRINTK */