1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * internal.h - printk internal definitions 4 */ 5 #include <linux/percpu.h> 6 7 #ifdef CONFIG_PRINTK 8 9 #define PRINTK_SAFE_CONTEXT_MASK 0x3fffffff 10 #define PRINTK_NMI_DIRECT_CONTEXT_MASK 0x40000000 11 #define PRINTK_NMI_CONTEXT_MASK 0x80000000 12 13 extern raw_spinlock_t logbuf_lock; 14 15 __printf(5, 0) 16 int vprintk_store(int facility, int level, 17 const char *dict, size_t dictlen, 18 const char *fmt, va_list args); 19 20 __printf(1, 0) int vprintk_default(const char *fmt, va_list args); 21 __printf(1, 0) int vprintk_deferred(const char *fmt, va_list args); 22 __printf(1, 0) int vprintk_func(const char *fmt, va_list args); 23 void __printk_safe_enter(void); 24 void __printk_safe_exit(void); 25 26 #define printk_safe_enter_irqsave(flags) \ 27 do { \ 28 local_irq_save(flags); \ 29 __printk_safe_enter(); \ 30 } while (0) 31 32 #define printk_safe_exit_irqrestore(flags) \ 33 do { \ 34 __printk_safe_exit(); \ 35 local_irq_restore(flags); \ 36 } while (0) 37 38 #define printk_safe_enter_irq() \ 39 do { \ 40 local_irq_disable(); \ 41 __printk_safe_enter(); \ 42 } while (0) 43 44 #define printk_safe_exit_irq() \ 45 do { \ 46 __printk_safe_exit(); \ 47 local_irq_enable(); \ 48 } while (0) 49 50 void defer_console_output(void); 51 52 #else 53 54 __printf(1, 0) int vprintk_func(const char *fmt, va_list args) { return 0; } 55 56 /* 57 * In !PRINTK builds we still export logbuf_lock spin_lock, console_sem 58 * semaphore and some of console functions (console_unlock()/etc.), so 59 * printk-safe must preserve the existing local IRQ guarantees. 60 */ 61 #define printk_safe_enter_irqsave(flags) local_irq_save(flags) 62 #define printk_safe_exit_irqrestore(flags) local_irq_restore(flags) 63 64 #define printk_safe_enter_irq() local_irq_disable() 65 #define printk_safe_exit_irq() local_irq_enable() 66 67 #endif /* CONFIG_PRINTK */ 68