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 0x3fffffff 22 #define PRINTK_NMI_DEFERRED_CONTEXT_MASK 0x40000000 23 #define PRINTK_NMI_CONTEXT_MASK 0x80000000 24 25 extern raw_spinlock_t logbuf_lock; 26 27 __printf(1, 0) int vprintk_default(const char *fmt, va_list args); 28 __printf(1, 0) int vprintk_deferred(const char *fmt, va_list args); 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 */ 73