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263 lines
7.7 KiB
263 lines
7.7 KiB
/* 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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#include <asm/percpu.h> |
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/* Currently lockdep_softirqs_on/off is used only by lockdep */ |
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#ifdef CONFIG_PROVE_LOCKING |
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extern void lockdep_softirqs_on(unsigned long ip); |
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extern void lockdep_softirqs_off(unsigned long ip); |
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extern void lockdep_hardirqs_on_prepare(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 lockdep_softirqs_on(unsigned long ip) { } |
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static inline void lockdep_softirqs_off(unsigned long ip) { } |
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static inline void lockdep_hardirqs_on_prepare(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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/* Per-task IRQ trace events information. */ |
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struct irqtrace_events { |
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unsigned int irq_events; |
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unsigned long hardirq_enable_ip; |
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unsigned long hardirq_disable_ip; |
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unsigned int hardirq_enable_event; |
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unsigned int hardirq_disable_event; |
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unsigned long softirq_disable_ip; |
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unsigned long softirq_enable_ip; |
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unsigned int softirq_disable_event; |
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unsigned int softirq_enable_event; |
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}; |
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DECLARE_PER_CPU(int, hardirqs_enabled); |
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DECLARE_PER_CPU(int, hardirq_context); |
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extern void trace_hardirqs_on_prepare(void); |
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extern void trace_hardirqs_off_finish(void); |
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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 lockdep_hardirq_context() (raw_cpu_read(hardirq_context)) |
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# define lockdep_softirq_context(p) ((p)->softirq_context) |
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# define lockdep_hardirqs_enabled() (this_cpu_read(hardirqs_enabled)) |
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# define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled) |
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# define lockdep_hardirq_enter() \ |
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do { \ |
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if (__this_cpu_inc_return(hardirq_context) == 1)\ |
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current->hardirq_threaded = 0; \ |
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} while (0) |
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# define lockdep_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 lockdep_hardirq_exit() \ |
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do { \ |
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__this_cpu_dec(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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({ \ |
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bool __expires_hardirq = true; \ |
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\ |
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if (!__hrtimer->is_hard) { \ |
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current->irq_config = 1; \ |
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__expires_hardirq = false; \ |
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} \ |
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__expires_hardirq; \ |
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}) |
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# define lockdep_hrtimer_exit(__expires_hardirq) \ |
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do { \ |
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if (!__expires_hardirq) \ |
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current->irq_config = 0; \ |
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} while (0) |
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# define lockdep_posixtimer_enter() \ |
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do { \ |
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current->irq_config = 1; \ |
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} while (0) |
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# define lockdep_posixtimer_exit() \ |
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do { \ |
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current->irq_config = 0; \ |
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} while (0) |
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# define lockdep_irq_work_enter(_flags) \ |
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do { \ |
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if (!((_flags) & IRQ_WORK_HARD_IRQ)) \ |
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current->irq_config = 1; \ |
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} while (0) |
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# define lockdep_irq_work_exit(_flags) \ |
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do { \ |
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if (!((_flags) & IRQ_WORK_HARD_IRQ)) \ |
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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_prepare() do { } while (0) |
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# define trace_hardirqs_off_finish() do { } while (0) |
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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 lockdep_hardirq_context() 0 |
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# define lockdep_softirq_context(p) 0 |
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# define lockdep_hardirqs_enabled() 0 |
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# define lockdep_softirqs_enabled(p) 0 |
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# define lockdep_hardirq_enter() do { } while (0) |
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# define lockdep_hardirq_threaded() do { } while (0) |
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# define lockdep_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) false |
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# define lockdep_hrtimer_exit(__context) do { } while (0) |
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# define lockdep_posixtimer_enter() do { } while (0) |
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# define lockdep_posixtimer_exit() do { } while (0) |
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# define lockdep_irq_work_enter(__work) do { } while (0) |
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# define lockdep_irq_work_exit(__work) 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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#ifdef CONFIG_DEBUG_IRQFLAGS |
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extern void warn_bogus_irq_restore(void); |
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#define raw_check_bogus_irq_restore() \ |
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do { \ |
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if (unlikely(!arch_irqs_disabled())) \ |
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warn_bogus_irq_restore(); \ |
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} while (0) |
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#else |
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#define raw_check_bogus_irq_restore() 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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raw_check_bogus_irq_restore(); \ |
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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 { \ |
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trace_hardirqs_on(); \ |
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raw_local_irq_enable(); \ |
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} while (0) |
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#define local_irq_disable() \ |
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do { \ |
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bool was_disabled = raw_irqs_disabled();\ |
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raw_local_irq_disable(); \ |
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if (!was_disabled) \ |
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trace_hardirqs_off(); \ |
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} 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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if (!raw_irqs_disabled_flags(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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trace_hardirqs_on(); \ |
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raw_local_irq_restore(flags); \ |
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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) do { raw_local_irq_save(flags); } 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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