kernel/printk/internal.h

   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_DIRECT_CONTEXT_MASK   0x40000000
  23 #define PRINTK_NMI_CONTEXT_MASK          0x80000000
  24
  25 extern raw_spinlock_t logbuf_lock;
  26
  27 __printf(5, 0)
  28 int vprintk_store(int facility, int level,
  29                   const char *dict, size_t dictlen,
  30                   const char *fmt, va_list args);
  31
  32 __printf(1, 0) int vprintk_default(const char *fmt, va_list args);
  33 __printf(1, 0) int vprintk_deferred(const char *fmt, va_list args);
  34 __printf(1, 0) int vprintk_func(const char *fmt, va_list args);
  35 void __printk_safe_enter(void);
  36 void __printk_safe_exit(void);
  37
  38 #define printk_safe_enter_irqsave(flags)        \
  39         do {                                    \
  40                 local_irq_save(flags);          \
  41                 __printk_safe_enter();          \
  42         } while (0)
  43
  44 #define printk_safe_exit_irqrestore(flags)      \
  45         do {                                    \
  46                 __printk_safe_exit();           \
  47                 local_irq_restore(flags);       \
  48         } while (0)
  49
  50 #define printk_safe_enter_irq()         \
  51         do {                                    \
  52                 local_irq_disable();            \
  53                 __printk_safe_enter();          \
  54         } while (0)
  55
  56 #define printk_safe_exit_irq()                  \
  57         do {                                    \
  58                 __printk_safe_exit();           \
  59                 local_irq_enable();             \
  60         } while (0)
  61
  62 void defer_console_output(void);
  63
  64 #else
  65
  66 __printf(1, 0) int vprintk_func(const char *fmt, va_list args) { return 0; }
  67
  68 /*
  69  * In !PRINTK builds we still export logbuf_lock spin_lock, console_sem
  70  * semaphore and some of console functions (console_unlock()/etc.), so
  71  * printk-safe must preserve the existing local IRQ guarantees.
  72  */
  73 #define printk_safe_enter_irqsave(flags) local_irq_save(flags)
  74 #define printk_safe_exit_irqrestore(flags) local_irq_restore(flags)
  75
  76 #define printk_safe_enter_irq() local_irq_disable()
  77 #define printk_safe_exit_irq() local_irq_enable()
  78
  79 #endif /* CONFIG_PRINTK */