include/asm-arm/hardirq.h

   1 #ifndef __ASM_HARDIRQ_H
   2 #define __ASM_HARDIRQ_H
   3
   4 #include <linux/config.h>
   5 #include <linux/threads.h>
   6
   7 extern unsigned int local_irq_count[NR_CPUS];
   8 extern unsigned int local_bh_count[NR_CPUS];
   9
  10 #define local_irq_count(cpu)    (local_irq_count[(cpu)])
  11 #define local_bh_count(cpu)     (local_bh_count[(cpu)])
  12
  13 /*
  14  * Are we in an interrupt context? Either doing bottom half
  15  * or hardware interrupt processing?
  16  */
  17 #define in_interrupt() ({ const int __cpu = smp_processor_id(); \
  18         (local_irq_count(__cpu) + local_bh_count(__cpu) != 0); })
  19
  20 #define in_irq() (local_irq_count(smp_processor_id()) != 0)
  21
  22 #ifndef CONFIG_SMP
  23
  24 #define hardirq_trylock(cpu)    (local_irq_count(cpu) == 0)
  25 #define hardirq_endlock(cpu)    do { } while (0)
  26
  27 #define irq_enter(cpu,irq)      (local_irq_count(cpu)++)
  28 #define irq_exit(cpu,irq)       (local_irq_count(cpu)--)
  29
  30 #define synchronize_irq()       do { } while (0)
  31
  32 #else
  33 #error SMP not supported
  34 #endif /* CONFIG_SMP */
  35
  36 #endif /* __ASM_HARDIRQ_H */