Release 4.15 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; }

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Petr Mladek
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16
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2
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/*
 * 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 */
Overall Contributors
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Linus Torvalds
4
2.37%
1
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Total
169
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5
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Directory: kernel/printk

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