[thirdparty/linux.git] / kernel / printk / internal.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * internal.h - printk internal definitions
 */
#include <linux/percpu.h>

#ifdef CONFIG_PRINTK

#define PRINTK_SAFE_CONTEXT_MASK	 0x3fffffff
#define PRINTK_NMI_DIRECT_CONTEXT_MASK	 0x40000000
#define PRINTK_NMI_CONTEXT_MASK		 0x80000000

extern raw_spinlock_t logbuf_lock;

__printf(5, 0)
int vprintk_store(int facility, int level,
		  const char *dict, size_t dictlen,
		  const char *fmt, va_list args);

__printf(1, 0) int vprintk_default(const char *fmt, va_list args);
__printf(1, 0) int vprintk_deferred(const char *fmt, va_list args);
__printf(1, 0) int vprintk_func(const char *fmt, va_list args);
void __printk_safe_enter(void);
void __printk_safe_exit(void);

#define printk_safe_enter_irqsave(flags)	\
	do {					\
		local_irq_save(flags);		\
		__printk_safe_enter();		\
	} while (0)

#define printk_safe_exit_irqrestore(flags)	\
	do {					\
		__printk_safe_exit();		\
		local_irq_restore(flags);	\
	} while (0)

#define printk_safe_enter_irq()		\
	do {					\
		local_irq_disable();		\
		__printk_safe_enter();		\
	} while (0)

#define printk_safe_exit_irq()			\
	do {					\
		__printk_safe_exit();		\
		local_irq_enable();		\
	} while (0)

void defer_console_output(void);

#else

__printf(1, 0) int vprintk_func(const char *fmt, va_list args) { return 0; }

/*
 * In !PRINTK builds we still export logbuf_lock spin_lock, console_sem
 * semaphore and some of console functions (console_unlock()/etc.), so
 * printk-safe must preserve the existing local IRQ guarantees.
 */
#define printk_safe_enter_irqsave(flags) local_irq_save(flags)
#define printk_safe_exit_irqrestore(flags) local_irq_restore(flags)

#define printk_safe_enter_irq() local_irq_disable()
#define printk_safe_exit_irq() local_irq_enable()

#endif /* CONFIG_PRINTK */
Commit	Line	Data
1ccea77e	1	/* SPDX-License-Identifier: GPL-2.0-or-later */
42a0bb3f PM	2	/*
42a0bb3f PM	3	* internal.h - printk internal definitions
42a0bb3f PM	4	*/
	5	#include <linux/percpu.h>
	6
099f1c84 SS	7	#ifdef CONFIG_PRINTK
099f1c84 SS	8
719f6a70	9	#define PRINTK_SAFE_CONTEXT_MASK 0x3fffffff
03fc7f9c	10	#define PRINTK_NMI_DIRECT_CONTEXT_MASK 0x40000000
719f6a70	11	#define PRINTK_NMI_CONTEXT_MASK 0x80000000
099f1c84 SS	12
	13	extern raw_spinlock_t logbuf_lock;
	14
03fc7f9c PM	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
099f1c84	20	__printf(1, 0) int vprintk_default(const char *fmt, va_list args);
719f6a70	21	__printf(1, 0) int vprintk_deferred(const char *fmt, va_list args);
099f1c84 SS	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
03fc7f9c PM	50	void defer_console_output(void);
03fc7f9c PM	51
099f1c84 SS	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 */