text: /*
   * include/linux/irqflags.h
   *
   * IRQ flags tracing: follow the state of the hardirq and softirq flags and
   * provide callbacks for transitions between ON and OFF states.
   *
   * This file gets included from lowlevel asm headers too, to provide
   * wrapped versions of the local_irq_*() APIs, based on the
   * raw_local_irq_*() macros from the lowlevel headers.
   */
  #ifndef _LINUX_TRACE_IRQFLAGS_H
  #define _LINUX_TRACE_IRQFLAGS_H
  
  #include <linux/typecheck.h>
  #include <asm/irqflags.h>
  
  #ifdef CONFIG_TRACE_IRQFLAGS
    extern void trace_softirqs_on(unsigned long ip);
    extern void trace_softirqs_off(unsigned long ip);
    extern void trace_hardirqs_on(void);
    extern void trace_hardirqs_off(void);
  # define trace_hardirq_context(p)	((p)->hardirq_context)
  # define trace_softirq_context(p)	((p)->softirq_context)
  # define trace_hardirqs_enabled(p)	((p)->hardirqs_enabled)
  # define trace_softirqs_enabled(p)	((p)->softirqs_enabled)
  # define trace_hardirq_enter()	do { current->hardirq_context++; } while (0)
  # define trace_hardirq_exit()	do { current->hardirq_context--; } while (0)
  # define lockdep_softirq_enter()	do { current->softirq_context++; } while (0)
  # define lockdep_softirq_exit()	do { current->softirq_context--; } while (0)
  # define INIT_TRACE_IRQFLAGS	.softirqs_enabled = 1,
  #else
  # define trace_hardirqs_on()		do { } while (0)
  # define trace_hardirqs_off()		do { } while (0)
  # define trace_softirqs_on(ip)		do { } while (0)
  # define trace_softirqs_off(ip)		do { } while (0)
  # define trace_hardirq_context(p)	0
  # define trace_softirq_context(p)	0
  # define trace_hardirqs_enabled(p)	0
  # define trace_softirqs_enabled(p)	0
  # define trace_hardirq_enter()		do { } while (0)
  # define trace_hardirq_exit()		do { } while (0)
  # define lockdep_softirq_enter()	do { } while (0)
  # define lockdep_softirq_exit()		do { } while (0)
  # define INIT_TRACE_IRQFLAGS
  #endif
  
  #if defined(CONFIG_IRQSOFF_TRACER) || \
  	defined(CONFIG_PREEMPT_TRACER)
   extern void stop_critical_timings(void);
   extern void start_critical_timings(void);
  #else
  # define stop_critical_timings() do { } while (0)
  # define start_critical_timings() do { } while (0)
  #endif
  
  /*
   * Wrap the arch provided IRQ routines to provide appropriate checks.
   */
  #define raw_local_irq_disable()		arch_local_irq_disable()
  #define raw_local_irq_enable()		arch_local_irq_enable()
  #define raw_local_irq_save(flags)			\
  	do {						\
  		typecheck(unsigned long, flags);	\
  		flags = arch_local_irq_save();		\
  	} while (0)
  #define raw_local_irq_restore(flags)			\
  	do {						\
  		typecheck(unsigned long, flags);	\
  		arch_local_irq_restore(flags);		\
  	} while (0)
  #define raw_local_save_flags(flags)			\
  	do {						\
  		typecheck(unsigned long, flags);	\
  		flags = arch_local_save_flags();	\
  	} while (0)
  #define raw_irqs_disabled_flags(flags)			\
  	({						\
  		typecheck(unsigned long, flags);	\
  		arch_irqs_disabled_flags(flags);	\
  	})
  #define raw_irqs_disabled()		(arch_irqs_disabled())
  #define raw_safe_halt()			arch_safe_halt()
  
  /*
   * The local_irq_*() APIs are equal to the raw_local_irq*()
   * if !TRACE_IRQFLAGS.
   */
  #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
  #define local_irq_enable() \
  	do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
  #define local_irq_disable() \
  	do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
  #define local_irq_save(flags)				\
  	do {						\
  		raw_local_irq_save(flags);		\
  		trace_hardirqs_off();			\
  	} while (0)
  
  
  #define local_irq_restore(flags)			\
  	do {						\
  		if (raw_irqs_disabled_flags(flags)) {	\
  			raw_local_irq_restore(flags);	\
  			trace_hardirqs_off();		\
  		} else {				\
  			trace_hardirqs_on();		\
  			raw_local_irq_restore(flags);	\
  		}					\
  	} while (0)
  #define local_save_flags(flags)				\
  	do {						\
  		raw_local_save_flags(flags);		\
  	} while (0)
  
  #define irqs_disabled_flags(flags)			\
  	({						\
  		raw_irqs_disabled_flags(flags);		\
  	})
  
  #define irqs_disabled()					\
  	({						\
  		unsigned long _flags;			\
  		raw_local_save_flags(_flags);		\
  		raw_irqs_disabled_flags(_flags);	\
  	})
  
  #define safe_halt()				\
  	do {					\
  		trace_hardirqs_on();		\
  		raw_safe_halt();		\
  	} while (0)
  
  
  #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
  
  #define local_irq_enable()	do { raw_local_irq_enable(); } while (0)
  #define local_irq_disable()	do { raw_local_irq_disable(); } while (0)
  #define local_irq_save(flags)					\
  	do {							\
  		raw_local_irq_save(flags);			\
  	} while (0)
  #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
  #define local_save_flags(flags)	do { raw_local_save_flags(flags); } while (0)
  #define irqs_disabled()		(raw_irqs_disabled())
  #define irqs_disabled_flags(flags) (raw_irqs_disabled_flags(flags))
  #define safe_halt()		do { raw_safe_halt(); } while (0)
  
  #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
  
  #endif
  