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
13extern raw_spinlock_t logbuf_lock;
14
15__printf(5, 0)
16int 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);
23void __printk_safe_enter(void);
24void __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
50void 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 */

 
 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 */