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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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40db173965
Set current->irq_config = 1 for hrtimers which are not marked to expire in hard interrupt context during hrtimer_init(). These timers will expire in softirq context on PREEMPT_RT. Setting this allows lockdep to differentiate these timers. If a timer is marked to expire in hard interrupt context then the timer callback is not supposed to acquire a regular spinlock instead of a raw_spinlock in the expiry callback. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20200321113242.534508206@linutronix.de
192 lines
5.7 KiB
C
192 lines
5.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* include/linux/irqflags.h
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*
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* IRQ flags tracing: follow the state of the hardirq and softirq flags and
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* provide callbacks for transitions between ON and OFF states.
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*
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* This file gets included from lowlevel asm headers too, to provide
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* wrapped versions of the local_irq_*() APIs, based on the
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* raw_local_irq_*() macros from the lowlevel headers.
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*/
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#ifndef _LINUX_TRACE_IRQFLAGS_H
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#define _LINUX_TRACE_IRQFLAGS_H
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#include <linux/typecheck.h>
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#include <asm/irqflags.h>
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/* Currently trace_softirqs_on/off is used only by lockdep */
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#ifdef CONFIG_PROVE_LOCKING
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extern void trace_softirqs_on(unsigned long ip);
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extern void trace_softirqs_off(unsigned long ip);
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extern void lockdep_hardirqs_on(unsigned long ip);
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extern void lockdep_hardirqs_off(unsigned long ip);
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#else
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static inline void trace_softirqs_on(unsigned long ip) { }
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static inline void trace_softirqs_off(unsigned long ip) { }
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static inline void lockdep_hardirqs_on(unsigned long ip) { }
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static inline void lockdep_hardirqs_off(unsigned long ip) { }
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#endif
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#ifdef CONFIG_TRACE_IRQFLAGS
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extern void trace_hardirqs_on(void);
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extern void trace_hardirqs_off(void);
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# define trace_hardirq_context(p) ((p)->hardirq_context)
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# define trace_softirq_context(p) ((p)->softirq_context)
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# define trace_hardirqs_enabled(p) ((p)->hardirqs_enabled)
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# define trace_softirqs_enabled(p) ((p)->softirqs_enabled)
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# define trace_hardirq_enter() \
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do { \
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if (!current->hardirq_context++) \
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current->hardirq_threaded = 0; \
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} while (0)
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# define trace_hardirq_threaded() \
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do { \
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current->hardirq_threaded = 1; \
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} while (0)
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# define trace_hardirq_exit() \
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do { \
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current->hardirq_context--; \
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} while (0)
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# define lockdep_softirq_enter() \
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do { \
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current->softirq_context++; \
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} while (0)
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# define lockdep_softirq_exit() \
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do { \
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current->softirq_context--; \
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} while (0)
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# define lockdep_hrtimer_enter(__hrtimer) \
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do { \
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if (!__hrtimer->is_hard) \
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current->irq_config = 1; \
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} while (0)
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# define lockdep_hrtimer_exit(__hrtimer) \
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do { \
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if (!__hrtimer->is_hard) \
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current->irq_config = 0; \
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} while (0)
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#else
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# define trace_hardirqs_on() do { } while (0)
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# define trace_hardirqs_off() do { } while (0)
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# define trace_hardirq_context(p) 0
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# define trace_softirq_context(p) 0
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# define trace_hardirqs_enabled(p) 0
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# define trace_softirqs_enabled(p) 0
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# define trace_hardirq_enter() do { } while (0)
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# define trace_hardirq_threaded() do { } while (0)
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# define trace_hardirq_exit() do { } while (0)
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# define lockdep_softirq_enter() do { } while (0)
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# define lockdep_softirq_exit() do { } while (0)
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# define lockdep_hrtimer_enter(__hrtimer) do { } while (0)
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# define lockdep_hrtimer_exit(__hrtimer) do { } while (0)
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#endif
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#if defined(CONFIG_IRQSOFF_TRACER) || \
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defined(CONFIG_PREEMPT_TRACER)
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extern void stop_critical_timings(void);
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extern void start_critical_timings(void);
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#else
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# define stop_critical_timings() do { } while (0)
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# define start_critical_timings() do { } while (0)
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#endif
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/*
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* Wrap the arch provided IRQ routines to provide appropriate checks.
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*/
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#define raw_local_irq_disable() arch_local_irq_disable()
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#define raw_local_irq_enable() arch_local_irq_enable()
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#define raw_local_irq_save(flags) \
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do { \
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typecheck(unsigned long, flags); \
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flags = arch_local_irq_save(); \
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} while (0)
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#define raw_local_irq_restore(flags) \
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do { \
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typecheck(unsigned long, flags); \
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arch_local_irq_restore(flags); \
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} while (0)
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#define raw_local_save_flags(flags) \
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do { \
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typecheck(unsigned long, flags); \
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flags = arch_local_save_flags(); \
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} while (0)
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#define raw_irqs_disabled_flags(flags) \
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({ \
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typecheck(unsigned long, flags); \
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arch_irqs_disabled_flags(flags); \
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})
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#define raw_irqs_disabled() (arch_irqs_disabled())
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#define raw_safe_halt() arch_safe_halt()
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/*
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* The local_irq_*() APIs are equal to the raw_local_irq*()
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* if !TRACE_IRQFLAGS.
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*/
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#ifdef CONFIG_TRACE_IRQFLAGS
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#define local_irq_enable() \
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do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
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#define local_irq_disable() \
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do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
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#define local_irq_save(flags) \
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do { \
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raw_local_irq_save(flags); \
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trace_hardirqs_off(); \
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} while (0)
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#define local_irq_restore(flags) \
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do { \
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if (raw_irqs_disabled_flags(flags)) { \
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raw_local_irq_restore(flags); \
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trace_hardirqs_off(); \
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} else { \
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trace_hardirqs_on(); \
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raw_local_irq_restore(flags); \
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} \
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} while (0)
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#define safe_halt() \
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do { \
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trace_hardirqs_on(); \
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raw_safe_halt(); \
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} while (0)
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#else /* !CONFIG_TRACE_IRQFLAGS */
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#define local_irq_enable() do { raw_local_irq_enable(); } while (0)
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#define local_irq_disable() do { raw_local_irq_disable(); } while (0)
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#define local_irq_save(flags) \
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do { \
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raw_local_irq_save(flags); \
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} while (0)
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#define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
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#define safe_halt() do { raw_safe_halt(); } while (0)
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#endif /* CONFIG_TRACE_IRQFLAGS */
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#define local_save_flags(flags) raw_local_save_flags(flags)
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/*
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* Some architectures don't define arch_irqs_disabled(), so even if either
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* definition would be fine we need to use different ones for the time being
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* to avoid build issues.
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*/
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#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
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#define irqs_disabled() \
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({ \
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unsigned long _flags; \
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raw_local_save_flags(_flags); \
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raw_irqs_disabled_flags(_flags); \
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})
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#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
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#define irqs_disabled() raw_irqs_disabled()
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#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
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#define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
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#endif
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