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linux/kernel/trace
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Steven Rostedt (VMware) 43e172e31b tracing: Move pipe reference to trace array instead of current_tracer 
commit 7ef282e05132d56b6f6b71e3873f317664bea78b upstream.

If a process has the trace_pipe open on a trace_array, the current tracer
for that trace array should not be changed. This was original enforced by a
global lock, but when instances were introduced, it was moved to the
current_trace. But this structure is shared by all instances, and a
trace_pipe is for a single instance. There's no reason that a process that
has trace_pipe open on one instance should prevent another instance from
changing its current tracer. Move the reference counter to the trace_array
instead.

This is marked as "Fixes" but is more of a clean up than a true fix.
Backport if you want, but its not critical.

Fixes: cf6ab6d9143b1 ("tracing: Add ref count to tracer for when they are being read by pipe")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
[Resolved conflict in __remove_instance()]
Signed-off-by: dann frazier <dann.frazier@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-08-21 13:05:27 +02:00
..
blktrace.c
blktrace: fix debugfs use after free
2020-08-19 08:15:55 +02:00
bpf_trace.c
bpf: Fix deadlock with rq_lock in bpf_send_signal()
2020-04-17 10:49:57 +02:00
fgraph.c
ftrace: Look up the address of return_to_handler() using helpers
2019-09-18 12:24:47 +10:00
ftrace_internal.h
treewide: Rename rcu_dereference_raw_notrace() to _check()
2019-08-01 14:16:21 -07:00
ftrace.c
tracing: Use trace_sched_process_free() instead of exit() for pid tracing
2020-08-21 13:05:27 +02:00
Kconfig
Stop the ad-hoc games with -Wno-maybe-initialized
2020-05-20 08:20:28 +02:00
Makefile
tracing: Add unified dynamic event framework
2018-12-08 20:54:09 -05:00
power-traces.c
…
preemptirq_delay_test.c
tracing: Use trace_clock_local() for looping in preemptirq_delay_test.c
2018-10-17 15:35:33 -04:00
ring_buffer_benchmark.c
tracing: Use CONFIG_PREEMPTION
2019-07-31 19:03:35 +02:00
ring_buffer.c
ring-buffer: Zero out time extend if it is nested and not absolute
2020-06-30 15:37:10 -04:00
rpm-traces.c
…
trace_benchmark.c
rcu: Rename cond_resched_rcu_qs() to cond_resched_tasks_rcu_qs()
2018-05-15 10:27:29 -07:00
trace_benchmark.h
tracing: Fix SPDX format headers to use C++ style comments
2018-08-16 19:08:06 -04:00
trace_branch.c
x86/uaccess, ftrace: Fix ftrace_likely_update() vs. SMAP
2019-04-03 11:02:24 +02:00
trace_clock.c
tracing: Add SPDX License format tags to tracing files
2018-08-16 19:08:06 -04:00
trace_dynevent.c
tracing: Add tracing_check_open_get_tr()
2019-10-12 20:44:07 -04:00
trace_dynevent.h
tracing/dynevent: Pass extra arguments to match operation
2019-08-31 12:19:38 -04:00
trace_entries.h
tracing: Change the function format to display function names by perf
2019-02-11 14:53:43 -05:00
trace_event_perf.c
tracing: Fix race in perf_trace_buf initialization
2019-10-21 19:38:28 -04:00
trace_events_filter_test.h
tracing: Fix SPDX format headers to use C++ style comments
2018-08-16 19:08:06 -04:00
trace_events_filter.c
tracing: Avoid memory leak in process_system_preds()
2020-01-09 10:20:00 +01:00
trace_events_hist.c
tracing: Fix memory leaks in trace_events_hist.c
2020-05-10 10:31:28 +02:00
trace_events_trigger.c
tracing: Fix event trigger to accept redundant spaces
2020-06-30 15:37:10 -04:00
trace_events.c
tracing: Use trace_sched_process_free() instead of exit() for pid tracing
2020-08-21 13:05:27 +02:00
trace_export.c
tracing: Add trigger file for trace_markers tracefs/ftrace/print
2018-05-29 08:28:53 -04:00
trace_functions_graph.c
fgraph: Remove redundant ftrace_graph_notrace_addr() test
2019-07-30 21:50:03 -04:00
trace_functions.c
…
trace_hwlat.c
tracing/hwlat: Honor the tracing_cpumask
2020-08-21 13:05:27 +02:00
trace_irqsoff.c
The biggest change for this release is in the histogram code.
2019-03-11 17:01:32 -07:00
trace_kdb.c
tracing: Silence GCC 9 array bounds warning
2019-05-25 23:04:30 -04:00
trace_kprobe_selftest.c
selftest/ftrace: Move kprobe selftest function to separate compile unit
2018-07-30 18:41:04 -04:00
trace_kprobe_selftest.h
tracing: Fix SPDX format headers to use C++ style comments
2018-08-16 19:08:06 -04:00
trace_kprobe.c
tracing/probe: Fix bpf_task_fd_query() for kprobes and uprobes
2020-06-24 17:50:43 +02:00
trace_mmiotrace.c
…
trace_nop.c
…
trace_output.c
tracing: Be more clever when dumping hex in __print_hex()
2019-09-17 11:21:28 -04:00
trace_output.h
tracing: Fix SPDX format headers to use C++ style comments
2018-08-16 19:08:06 -04:00
trace_preemptirq.c
kprobes: Prohibit probing on hardirq tracers
2019-02-13 08:16:40 +01:00
trace_printk.c
tracing: Add locked_down checks to the open calls of files created for tracefs
2019-10-12 20:48:06 -04:00
trace_probe_tmpl.h
tracing/probe: Support user-space dereference
2019-05-25 23:04:42 -04:00
trace_probe.c
tracing/probe: Fix memleak in fetch_op_data operations
2020-06-24 17:50:51 +02:00
trace_probe.h
tracing/uprobe: Fix to make trace_uprobe_filter alignment safe
2020-02-05 21:22:53 +00:00
trace_sched_switch.c
tracing: Fix sched switch start/stop refcount racy updates
2020-02-11 04:35:07 -08:00
trace_sched_wakeup.c
kernel/trace: Fix do not unregister tracepoints when register sched_migrate_task fail
2020-01-14 20:08:22 +01:00
trace_selftest_dynamic.c
…
trace_selftest.c
function_graph: Have selftest also emulate tr->reset() as it did with tr->init()
2019-04-21 19:46:56 -04:00
trace_seq.c
tracing: Add SPDX License format tags to tracing files
2018-08-16 19:08:06 -04:00
trace_stack.c
tracing: Have stack tracer compile when MCOUNT_INSN_SIZE is not defined
2020-01-14 20:08:22 +01:00
trace_stat.c
tracing: Fix very unlikely race of registering two stat tracers
2020-02-24 08:36:30 +01:00
trace_stat.h
tracing: Fix SPDX format headers to use C++ style comments
2018-08-16 19:08:06 -04:00
trace_syscalls.c
syscalls: Remove start and number from syscall_get_arguments() args
2019-04-05 09:26:43 -04:00
trace_uprobe.c
tracing/probe: Fix bpf_task_fd_query() for kprobes and uprobes
2020-06-24 17:50:43 +02:00
trace.c
tracing: Move pipe reference to trace array instead of current_tracer
2020-08-21 13:05:27 +02:00
trace.h
tracing: Move pipe reference to trace array instead of current_tracer
2020-08-21 13:05:27 +02:00
tracing_map.c
tracing: Have the histogram compare functions convert to u64 first
2020-01-09 10:20:00 +01:00
tracing_map.h
tracing: Fix SPDX format headers to use C++ style comments
2018-08-16 19:08:06 -04:00