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Release 4.12 include/linux/irqflags.h

Directory: include/linux
/*
 * 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

#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 safe_halt()				\
	do {                                    \
                trace_hardirqs_on();            \
                raw_safe_halt();                \
        } while (0)


#else /* !CONFIG_TRACE_IRQFLAGS */


#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 safe_halt()		do { raw_safe_halt(); } while (0)

#endif /* CONFIG_TRACE_IRQFLAGS */


#define local_save_flags(flags)	raw_local_save_flags(flags)

/*
 * Some architectures don't define arch_irqs_disabled(), so even if either
 * definition would be fine we need to use different ones for the time being
 * to avoid build issues.
 */
#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT

#define irqs_disabled()					\
	({                                              \
                unsigned long _flags;                   \
                raw_local_save_flags(_flags);           \
                raw_irqs_disabled_flags(_flags);        \
        })
#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */

#define irqs_disabled()	raw_irqs_disabled()
#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */


#define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)

#endif

Overall Contributors

PersonTokensPropCommitsCommitProp
Ingo Molnar21957.18%225.00%
David Howells7619.84%112.50%
Steven Rostedt5815.14%337.50%
Jan Beulich297.57%112.50%
Michael Neuling10.26%112.50%
Total383100.00%8100.00%
Directory: include/linux
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