[mirror_ubuntu-bionic-kernel.git] / kernel / printk / internal.h

/*
 * internal.h - printk internal definitions
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 */
#include <linux/percpu.h>

#ifdef CONFIG_PRINTK

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

extern raw_spinlock_t logbuf_lock;

__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)

#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
42a0bb3f PM	1	/*
	2	* internal.h - printk internal definitions
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version 2
	7	* of the License, or (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, see <http://www.gnu.org/licenses/>.
	16	*/
	17	#include <linux/percpu.h>
	18
099f1c84 SS	19	#ifdef CONFIG_PRINTK
099f1c84 SS	20
719f6a70 PM	21	#define PRINTK_SAFE_CONTEXT_MASK 0x3fffffff
	22	#define PRINTK_NMI_DEFERRED_CONTEXT_MASK 0x40000000
	23	#define PRINTK_NMI_CONTEXT_MASK 0x80000000
099f1c84 SS	24
	25	extern raw_spinlock_t logbuf_lock;
	26
	27	__printf(1, 0) int vprintk_default(const char *fmt, va_list args);
719f6a70	28	__printf(1, 0) int vprintk_deferred(const char *fmt, va_list args);
099f1c84 SS	29	__printf(1, 0) int vprintk_func(const char *fmt, va_list args);
	30	void __printk_safe_enter(void);
	31	void __printk_safe_exit(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	#define printk_safe_enter_irq() \
	46	do { \
	47	local_irq_disable(); \
	48	__printk_safe_enter(); \
	49	} while (0)
	50
	51	#define printk_safe_exit_irq() \
	52	do { \
	53	__printk_safe_exit(); \
	54	local_irq_enable(); \
	55	} while (0)
	56
	57	#else
	58
	59	__printf(1, 0) int vprintk_func(const char *fmt, va_list args) { return 0; }
	60
	61	/*
	62	* In !PRINTK builds we still export logbuf_lock spin_lock, console_sem
	63	* semaphore and some of console functions (console_unlock()/etc.), so
	64	* printk-safe must preserve the existing local IRQ guarantees.
	65	*/
	66	#define printk_safe_enter_irqsave(flags) local_irq_save(flags)
	67	#define printk_safe_exit_irqrestore(flags) local_irq_restore(flags)
	68
	69	#define printk_safe_enter_irq() local_irq_disable()
	70	#define printk_safe_exit_irq() local_irq_enable()
	71
	72	#endif /* CONFIG_PRINTK */