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bff1b208a5
Joel Fernandes created a nice patch that cleaned up the duplicate hooks used by lockdep and irqsoff latency tracer. It made both use tracepoints. But it caused lockdep to trigger several false positives. We have not figured out why yet, but removing lockdep from using the trace event hooks and just call its helper functions directly (like it use to), makes the problem go away. This is a partial revert of the clean up patchc3bc8fd637("tracing: Centralize preemptirq tracepoints and unify their usage") that adds direct calls for lockdep, but also keeps most of the clean up done to get rid of the horrible preprocessor if statements. Link: http://lkml.kernel.org/r/20180806155058.5ee875f4@gandalf.local.home Cc: Peter Zijlstra <peterz@infradead.org> Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org> Fixes:c3bc8fd637("tracing: Centralize preemptirq tracepoints and unify their usage") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
77 lines
1.8 KiB
C
77 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* preemptoff and irqoff tracepoints
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*
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* Copyright (C) Joel Fernandes (Google) <joel@joelfernandes.org>
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*/
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#include <linux/kallsyms.h>
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#include <linux/uaccess.h>
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#include <linux/module.h>
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#include <linux/ftrace.h>
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#define CREATE_TRACE_POINTS
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#include <trace/events/preemptirq.h>
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#ifdef CONFIG_TRACE_IRQFLAGS
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/* Per-cpu variable to prevent redundant calls when IRQs already off */
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static DEFINE_PER_CPU(int, tracing_irq_cpu);
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void trace_hardirqs_on(void)
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{
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if (this_cpu_read(tracing_irq_cpu)) {
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trace_irq_enable_rcuidle(CALLER_ADDR0, CALLER_ADDR1);
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this_cpu_write(tracing_irq_cpu, 0);
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}
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lockdep_hardirqs_on(CALLER_ADDR0);
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}
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EXPORT_SYMBOL(trace_hardirqs_on);
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void trace_hardirqs_off(void)
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{
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if (!this_cpu_read(tracing_irq_cpu)) {
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this_cpu_write(tracing_irq_cpu, 1);
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trace_irq_disable_rcuidle(CALLER_ADDR0, CALLER_ADDR1);
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}
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lockdep_hardirqs_off(CALLER_ADDR0);
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}
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EXPORT_SYMBOL(trace_hardirqs_off);
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__visible void trace_hardirqs_on_caller(unsigned long caller_addr)
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{
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if (this_cpu_read(tracing_irq_cpu)) {
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trace_irq_enable_rcuidle(CALLER_ADDR0, caller_addr);
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this_cpu_write(tracing_irq_cpu, 0);
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}
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lockdep_hardirqs_on(CALLER_ADDR0);
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}
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EXPORT_SYMBOL(trace_hardirqs_on_caller);
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__visible void trace_hardirqs_off_caller(unsigned long caller_addr)
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{
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if (!this_cpu_read(tracing_irq_cpu)) {
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this_cpu_write(tracing_irq_cpu, 1);
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trace_irq_disable_rcuidle(CALLER_ADDR0, caller_addr);
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}
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lockdep_hardirqs_off(CALLER_ADDR0);
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}
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EXPORT_SYMBOL(trace_hardirqs_off_caller);
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#endif /* CONFIG_TRACE_IRQFLAGS */
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#ifdef CONFIG_TRACE_PREEMPT_TOGGLE
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void trace_preempt_on(unsigned long a0, unsigned long a1)
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{
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trace_preempt_enable_rcuidle(a0, a1);
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}
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void trace_preempt_off(unsigned long a0, unsigned long a1)
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{
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trace_preempt_disable_rcuidle(a0, a1);
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}
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#endif
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