mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 13:55:32 +00:00
b09be676e0
Lockdep is a runtime locking correctness validator that detects and reports a deadlock or its possibility by checking dependencies between locks. It's useful since it does not report just an actual deadlock but also the possibility of a deadlock that has not actually happened yet. That enables problems to be fixed before they affect real systems. However, this facility is only applicable to typical locks, such as spinlocks and mutexes, which are normally released within the context in which they were acquired. However, synchronization primitives like page locks or completions, which are allowed to be released in any context, also create dependencies and can cause a deadlock. So lockdep should track these locks to do a better job. The 'crossrelease' implementation makes these primitives also be tracked. Signed-off-by: Byungchul Park <byungchul.park@lge.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: akpm@linux-foundation.org Cc: boqun.feng@gmail.com Cc: kernel-team@lge.com Cc: kirill@shutemov.name Cc: npiggin@gmail.com Cc: walken@google.com Cc: willy@infradead.org Link: http://lkml.kernel.org/r/1502089981-21272-6-git-send-email-byungchul.park@lge.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
167 lines
4.9 KiB
C
167 lines
4.9 KiB
C
/*
|
|
* 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++; \
|
|
crossrelease_hist_start(XHLOCK_HARD); \
|
|
} while (0)
|
|
# define trace_hardirq_exit() \
|
|
do { \
|
|
current->hardirq_context--; \
|
|
crossrelease_hist_end(XHLOCK_HARD); \
|
|
} while (0)
|
|
# define lockdep_softirq_enter() \
|
|
do { \
|
|
current->softirq_context++; \
|
|
crossrelease_hist_start(XHLOCK_SOFT); \
|
|
} while (0)
|
|
# define lockdep_softirq_exit() \
|
|
do { \
|
|
current->softirq_context--; \
|
|
crossrelease_hist_end(XHLOCK_SOFT); \
|
|
} 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
|