include/linux/hardirq.h

   1 #ifndef LINUX_HARDIRQ_H
   2 #define LINUX_HARDIRQ_H
   3
   4 #include <linux/preempt_mask.h>
   5 #include <linux/lockdep.h>
   6 #include <linux/ftrace_irq.h>
   7 #include <linux/vtime.h>
   8 #include <asm/hardirq.h>
   9
  10
  11 extern void synchronize_irq(unsigned int irq);
  12
  13 #if defined(CONFIG_TINY_RCU)
  14
  15 static inline void rcu_nmi_enter(void)
  16 {
  17 }
  18
  19 static inline void rcu_nmi_exit(void)
  20 {
  21 }
  22
  23 #else
  24 extern void rcu_nmi_enter(void);
  25 extern void rcu_nmi_exit(void);
  26 #endif
  27
  28 /*
  29  * It is safe to do non-atomic ops on ->hardirq_context,
  30  * because NMI handlers may not preempt and the ops are
  31  * always balanced, so the interrupted value of ->hardirq_context
  32  * will always be restored.
  33  */
  34 #define __irq_enter()                                   \
  35         do {                                            \
  36                 account_irq_enter_time(current);        \
  37                 preempt_count_add(HARDIRQ_OFFSET);      \
  38                 trace_hardirq_enter();                  \
  39         } while (0)
  40
  41 /*
  42  * Enter irq context (on NO_HZ, update jiffies):
  43  */
  44 extern void irq_enter(void);
  45
  46 /*
  47  * Exit irq context without processing softirqs:
  48  */
  49 #define __irq_exit()                                    \
  50         do {                                            \
  51                 trace_hardirq_exit();                   \
  52                 account_irq_exit_time(current);         \
  53                 preempt_count_sub(HARDIRQ_OFFSET);      \
  54         } while (0)
  55
  56 /*
  57  * Exit irq context and process softirqs if needed:
  58  */
  59 extern void irq_exit(void);
  60
  61 #define nmi_enter()                                             \
  62         do {                                                    \
  63                 lockdep_off();                                  \
  64                 ftrace_nmi_enter();                             \
  65                 BUG_ON(in_nmi());                               \
  66                 preempt_count_add(NMI_OFFSET + HARDIRQ_OFFSET); \
  67                 rcu_nmi_enter();                                \
  68                 trace_hardirq_enter();                          \
  69         } while (0)
  70
  71 #define nmi_exit()                                              \
  72         do {                                                    \
  73                 trace_hardirq_exit();                           \
  74                 rcu_nmi_exit();                                 \
  75                 BUG_ON(!in_nmi());                              \
  76                 preempt_count_sub(NMI_OFFSET + HARDIRQ_OFFSET); \
  77                 ftrace_nmi_exit();                              \
  78                 lockdep_on();                                   \
  79         } while (0)
  80
  81 #endif /* LINUX_HARDIRQ_H */