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
19typedef __printf(1, 0) int (*printk_func_t)(const char *fmt, va_list args);
20
21int __printf(1, 0) vprintk_default(const char *fmt, va_list args);
22
23#ifdef CONFIG_PRINTK_NMI
24
25extern raw_spinlock_t logbuf_lock;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
26
27/*
28 * printk() could not take logbuf_lock in NMI context. Instead,
29 * it temporary stores the strings into a per-CPU buffer.
30 * The alternative implementation is chosen transparently
31 * via per-CPU variable.
32 */
33DECLARE_PER_CPU(printk_func_t, printk_func);
34static inline __printf(1, 0) int vprintk_func(const char *fmt, va_list args)
35{
36	return this_cpu_read(printk_func)(fmt, args);
37}
38
39extern atomic_t nmi_message_lost;
40static inline int get_nmi_message_lost(void)
41{
42	return atomic_xchg(&nmi_message_lost, 0);
43}
44
45#else /* CONFIG_PRINTK_NMI */
46
47static inline __printf(1, 0) int vprintk_func(const char *fmt, va_list args)
48{
49	return vprintk_default(fmt, args);
50}
51
52static inline int get_nmi_message_lost(void)
53{
54	return 0;
55}
56
57#endif /* CONFIG_PRINTK_NMI */
 

 1/* SPDX-License-Identifier: GPL-2.0-or-later */
 2/*
 3 * internal.h - printk internal definitions
 
 
 
 
 
 
 
 
 
 
 
 
 
 4 */
 5#include <linux/percpu.h>
 6
 7#if defined(CONFIG_PRINTK) && defined(CONFIG_SYSCTL)
 8void __init printk_sysctl_init(void);
 9int devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write,
10			      void *buffer, size_t *lenp, loff_t *ppos);
11#else
12#define printk_sysctl_init() do { } while (0)
13#endif
14
15#ifdef CONFIG_PRINTK
16
17/* Flags for a single printk record. */
18enum printk_info_flags {
19	LOG_NEWLINE	= 2,	/* text ended with a newline */
20	LOG_CONT	= 8,	/* text is a fragment of a continuation line */
21};
22
23__printf(4, 0)
24int vprintk_store(int facility, int level,
25		  const struct dev_printk_info *dev_info,
26		  const char *fmt, va_list args);
27
28__printf(1, 0) int vprintk_default(const char *fmt, va_list args);
29__printf(1, 0) int vprintk_deferred(const char *fmt, va_list args);
30
31bool printk_percpu_data_ready(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
45void defer_console_output(void);
46
47u16 printk_parse_prefix(const char *text, int *level,
48			enum printk_info_flags *flags);
49#else
50
51/*
52 * In !PRINTK builds we still export console_sem
53 * semaphore and some of console functions (console_unlock()/etc.), so
54 * printk-safe must preserve the existing local IRQ guarantees.
 
55 */
56#define printk_safe_enter_irqsave(flags) local_irq_save(flags)
57#define printk_safe_exit_irqrestore(flags) local_irq_restore(flags)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
58
59static inline bool printk_percpu_data_ready(void) { return false; }
60#endif /* CONFIG_PRINTK */