root/include/linux/irqflags.h

INCLUDED FROM

/*
 * 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