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 19 #ifdef CONFIG_PRINTK 20 21 #define PRINTK_SAFE_CONTEXT_MASK 0x7fffffff 22 #define PRINTK_NMI_CONTEXT_MASK 0x80000000 23 24 extern raw_spinlock_t logbuf_lock; 25 26 __printf(1, 0) int vprintk_default(const char *fmt, va_list args); 27 __printf(1, 0) int vprintk_func(const char *fmt, va_list args); 28 void __printk_safe_enter(void); 29 void __printk_safe_exit(void); 30 31 #define printk_safe_enter_irqsave(flags) \ 32 do { \ 33 local_irq_save(flags); \ 34 __printk_safe_enter(); \ 35 } while (0) 36 37 #define printk_safe_exit_irqrestore(flags) \ 38 do { \ 39 __printk_safe_exit(); \ 40 local_irq_restore(flags); \ 41 } while (0) 42 43 #define printk_safe_enter_irq() \ 44 do { \ 45 local_irq_disable(); \ 46 __printk_safe_enter(); \ 47 } while (0) 48 49 #define printk_safe_exit_irq() \ 50 do { \ 51 __printk_safe_exit(); \ 52 local_irq_enable(); \ 53 } while (0) 54 55 #else 56 57 __printf(1, 0) int vprintk_func(const char *fmt, va_list args) { return 0; } 58 59 /* 60 * In !PRINTK builds we still export logbuf_lock spin_lock, console_sem 61 * semaphore and some of console functions (console_unlock()/etc.), so 62 * printk-safe must preserve the existing local IRQ guarantees. 63 */ 64 #define printk_safe_enter_irqsave(flags) local_irq_save(flags) 65 #define printk_safe_exit_irqrestore(flags) local_irq_restore(flags) 66 67 #define printk_safe_enter_irq() local_irq_disable() 68 #define printk_safe_exit_irq() local_irq_enable() 69 70 #endif /* CONFIG_PRINTK */ 71