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 void printk_safe_init(void); 27 bool printk_percpu_data_ready(void); 28 29 #define printk_safe_enter_irqsave(flags) \ 30 do { \ 31 local_irq_save(flags); \ 32 __printk_safe_enter(); \ 33 } while (0) 34 35 #define printk_safe_exit_irqrestore(flags) \ 36 do { \ 37 __printk_safe_exit(); \ 38 local_irq_restore(flags); \ 39 } while (0) 40 41 #define printk_safe_enter_irq() \ 42 do { \ 43 local_irq_disable(); \ 44 __printk_safe_enter(); \ 45 } while (0) 46 47 #define printk_safe_exit_irq() \ 48 do { \ 49 __printk_safe_exit(); \ 50 local_irq_enable(); \ 51 } while (0) 52 53 void defer_console_output(void); 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 static inline void printk_safe_init(void) { } 71 static inline bool printk_percpu_data_ready(void) { return false; } 72 #endif /* CONFIG_PRINTK */ 73