2 * internal.h - printk internal definitions
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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.
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12 * GNU General Public License for more details.
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17 #include <linux/percpu.h>
19 typedef __printf(2, 0) int (*printk_func_t)(int level, const char *fmt,
23 int vprintk_default(int level, const char *fmt, va_list args);
25 #ifdef CONFIG_PRINTK_NMI
27 extern raw_spinlock_t logbuf_lock;
30 * printk() could not take logbuf_lock in NMI context. Instead,
31 * it temporary stores the strings into a per-CPU buffer.
32 * The alternative implementation is chosen transparently
33 * via per-CPU variable.
35 DECLARE_PER_CPU(printk_func_t, printk_func);
37 static inline int vprintk_func(int level, const char *fmt, va_list args)
39 return this_cpu_read(printk_func)(level, fmt, args);
42 extern atomic_t nmi_message_lost;
43 static inline int get_nmi_message_lost(void)
45 return atomic_xchg(&nmi_message_lost, 0);
48 #else /* CONFIG_PRINTK_NMI */
51 static inline int vprintk_func(int level, const char *fmt, va_list args)
53 return vprintk_default(level, fmt, args);
56 static inline int get_nmi_message_lost(void)
61 #endif /* CONFIG_PRINTK_NMI */