/* * 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_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 */