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
19#ifdef CONFIG_PRINTK
20
21#define PRINTK_SAFE_CONTEXT_MASK	 0x3fffffff
22#define PRINTK_NMI_DEFERRED_CONTEXT_MASK 0x40000000
23#define PRINTK_NMI_CONTEXT_MASK		 0x80000000
24
25extern raw_spinlock_t logbuf_lock;
26
27__printf(1, 0) int vprintk_default(const char *fmt, va_list args);
28__printf(1, 0) int vprintk_deferred(const char *fmt, va_list args);
29__printf(1, 0) int vprintk_func(const char *fmt, va_list args);
30void __printk_safe_enter(void);
31void __printk_safe_exit(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
45#define printk_safe_enter_irq()		\
46	do {					\
47		local_irq_disable();		\
48		__printk_safe_enter();		\
49	} while (0)
50
51#define printk_safe_exit_irq()			\
52	do {					\
53		__printk_safe_exit();		\
54		local_irq_enable();		\
55	} while (0)
56
57#else
58
59__printf(1, 0) int vprintk_func(const char *fmt, va_list args) { return 0; }
60
61/*
62 * In !PRINTK builds we still export logbuf_lock spin_lock, console_sem
63 * semaphore and some of console functions (console_unlock()/etc.), so
64 * printk-safe must preserve the existing local IRQ guarantees.
65 */
66#define printk_safe_enter_irqsave(flags) local_irq_save(flags)
67#define printk_safe_exit_irqrestore(flags) local_irq_restore(flags)
68
69#define printk_safe_enter_irq() local_irq_disable()
70#define printk_safe_exit_irq() local_irq_enable()
71
72#endif /* CONFIG_PRINTK */