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da5b3ebb45
Recently we tried to make the preemptirqsoff tracer to use irqsoff tracepoint probes. However this causes issues as reported by Masami: [2.271078] Testing tracer preemptirqsoff: .. no entries found ..FAILED! [2.381015] WARNING: CPU: 0 PID: 1 at /home/mhiramat/ksrc/linux/kernel/ trace/trace.c:1512 run_tracer_selftest+0xf3/0x154 This is due to the tracepoint code increasing the preempt nesting count by calling an additional preempt_disable before calling into the preemptoff tracer which messes up the preempt_count() check in tracer_hardirqs_off. To fix this, make the irqsoff tracer probes balance the additional outer preempt_disable with a preempt_enable_notrace. The other way to fix this is to just use SRCU for all tracepoints. However we can't do that because we can't use NMIs from RCU context. Link: http://lkml.kernel.org/r/20180806034049.67949-1-joel@joelfernandes.org Fixes: |
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| .. | ||
| blktrace.c | ||
| bpf_trace.c | ||
| ftrace.c | ||
| Kconfig | ||
| Makefile | ||
| power-traces.c | ||
| preemptirq_delay_test.c | ||
| ring_buffer_benchmark.c | ||
| ring_buffer.c | ||
| rpm-traces.c | ||
| trace_benchmark.c | ||
| trace_benchmark.h | ||
| trace_branch.c | ||
| trace_clock.c | ||
| trace_entries.h | ||
| trace_event_perf.c | ||
| trace_events_filter_test.h | ||
| trace_events_filter.c | ||
| trace_events_hist.c | ||
| trace_events_trigger.c | ||
| trace_events.c | ||
| trace_export.c | ||
| trace_functions_graph.c | ||
| trace_functions.c | ||
| trace_hwlat.c | ||
| trace_irqsoff.c | ||
| trace_kdb.c | ||
| trace_kprobe_selftest.c | ||
| trace_kprobe_selftest.h | ||
| trace_kprobe.c | ||
| trace_mmiotrace.c | ||
| trace_nop.c | ||
| trace_output.c | ||
| trace_output.h | ||
| trace_preemptirq.c | ||
| trace_printk.c | ||
| trace_probe.c | ||
| trace_probe.h | ||
| trace_sched_switch.c | ||
| trace_sched_wakeup.c | ||
| trace_selftest_dynamic.c | ||
| trace_selftest.c | ||
| trace_seq.c | ||
| trace_stack.c | ||
| trace_stat.c | ||
| trace_stat.h | ||
| trace_syscalls.c | ||
| trace_uprobe.c | ||
| trace.c | ||
| trace.h | ||
| tracing_map.c | ||
| tracing_map.h | ||