/* * 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 */