Alan Maguire ac5a72ea5c bpf: Use dedicated bpf_trace_printk event instead of trace_printk() ...

The bpf helper bpf_trace_printk() uses trace_printk() under the hood.
This leads to an alarming warning message originating from trace
buffer allocation which occurs the first time a program using
bpf_trace_printk() is loaded.

We can instead create a trace event for bpf_trace_printk() and enable
it in-kernel when/if we encounter a program using the
bpf_trace_printk() helper.  With this approach, trace_printk()
is not used directly and no warning message appears.

This work was started by Steven (see Link) and finished by Alan; added
Steven's Signed-off-by with his permission.

Signed-off-by: Steven Rostedt (VMware) <[email protected]>
Signed-off-by: Alan Maguire <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
Acked-by: Andrii Nakryiko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Link: https://lore.kernel.org/bpf/[email protected]

2020-07-13 16:55:49 -07:00

..

blktrace.c

blktrace: Avoid sparse warnings when assigning q->blk_trace

2020-06-17 09:07:11 -06:00

bpf_trace.c

bpf: Use dedicated bpf_trace_printk event instead of trace_printk()

2020-07-13 16:55:49 -07:00

bpf_trace.h

bpf: Use dedicated bpf_trace_printk event instead of trace_printk()

2020-07-13 16:55:49 -07:00

fgraph.c

tracing: Define MCOUNT_INSN_SIZE when not defined without direct calls

2020-01-02 21:56:44 -05:00

ftrace_internal.h

x86/ftrace: Have ftrace trampolines turn read-only at the end of system boot up

2020-05-12 18:24:34 -04:00

ftrace.c

ftrace: Fix maybe-uninitialized compiler warning

2020-06-17 17:13:18 -04:00

Kconfig

Merge tag 'trace-v5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2020-06-09 10:06:18 -07:00

kprobe_event_gen_test.c

tracing: Add kprobe event command generation test module

2020-01-30 09:46:28 -05:00

Makefile

bpf: Use dedicated bpf_trace_printk event instead of trace_printk()

2020-07-13 16:55:49 -07:00

power-traces.c

…

preemptirq_delay_test.c

tracing: Wait for preempt irq delay thread to execute

2020-05-11 17:00:34 -04:00

ring_buffer_benchmark.c

tracing: Make struct ring_buffer less ambiguous

2020-01-13 13:19:38 -05:00

ring_buffer.c

ring-buffer: Zero out time extend if it is nested and not absolute

2020-06-23 11:18:42 -04:00

rpm-traces.c

…

synth_event_gen_test.c

tracing: Have synthetic event test use raw_smp_processor_id()

2020-02-20 17:43:41 -05:00

trace_benchmark.c

…

trace_benchmark.h

…

trace_boot.c

tracing/boottime: Fix kprobe multiple events

2020-06-23 21:51:50 -04:00

trace_branch.c

tracing: Make struct ring_buffer less ambiguous

2020-01-13 13:19:38 -05:00

trace_clock.c

…

trace_dynevent.c

tracing: Use seq_buf for building dynevent_cmd string

2020-02-01 13:10:15 -05:00

trace_dynevent.h

tracing: Remove check_arg() callbacks from dynevent args

2020-02-01 13:09:23 -05:00

trace_entries.h

tracing: Make ftrace packed events have align of 1

2020-06-16 21:21:02 -04:00

trace_event_perf.c

…

trace_events_filter_test.h

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trace_events_filter.c

tracing: Avoid memory leak in process_system_preds()

2019-12-19 18:24:17 -05:00

trace_events_hist.c

tracing: Move synthetic events to a separate file

2020-06-01 08:23:22 -04:00

trace_events_inject.c

tracing: Initialize val to zero in parse_entry of inject code

2020-01-02 19:04:57 -05:00

trace_events_synth.c

tracing: Move synthetic events to a separate file

2020-06-01 08:23:22 -04:00

trace_events_trigger.c

tracing: Fix event trigger to accept redundant spaces

2020-06-23 21:51:40 -04:00

trace_events.c

tracing: Add hist_debug trace event files for histogram debugging

2020-06-01 08:22:30 -04:00

trace_export.c

tracing: Make ftrace packed events have align of 1

2020-06-16 21:21:02 -04:00

trace_functions_graph.c

ring-buffer: Rename ring_buffer_read() to read_buffer_iter_advance()

2020-03-19 19:11:19 -04:00

trace_functions.c

trace: Fix typo in allocate_ftrace_ops()'s comment

2020-06-16 21:21:02 -04:00

trace_hwlat.c

tracing: Have hwlat ts be first instance and record count of instances

2020-03-03 17:33:43 -05:00

trace_irqsoff.c

tracing: Rename trace_buffer to array_buffer

2020-01-13 13:19:38 -05:00

trace_kdb.c

tracing: Rename trace_buffer to array_buffer

2020-01-13 13:19:38 -05:00

trace_kprobe_selftest.c

…

trace_kprobe_selftest.h

…

trace_kprobe.c

maccess: rename probe_user_{read,write} to copy_{from,to}_user_nofault

2020-06-17 10:57:41 -07:00

trace_mmiotrace.c

tracing: Make struct ring_buffer less ambiguous

2020-01-13 13:19:38 -05:00

trace_nop.c

…

trace_output.c

mmap locking API: use coccinelle to convert mmap_sem rwsem call sites

2020-06-09 09:39:14 -07:00

trace_output.h

…

trace_preemptirq.c

x86/entry: Rename trace_hardirqs_off_prepare()

2020-06-11 15:15:24 +02:00

trace_printk.c

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trace_probe_tmpl.h

…

trace_probe.c

tracing/probe: Fix memleak in fetch_op_data operations

2020-06-16 21:21:02 -04:00

trace_probe.h

tracing/probe: Replace zero-length array with flexible-array

2020-06-15 23:08:32 -05:00

trace_sched_switch.c

tracing: Fix sched switch start/stop refcount racy updates

2020-01-30 09:46:10 -05:00

trace_sched_wakeup.c

tracing: Make struct ring_buffer less ambiguous

2020-01-13 13:19:38 -05:00

trace_selftest_dynamic.c

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trace_selftest.c

tracing: Rename trace_buffer to array_buffer

2020-01-13 13:19:38 -05:00

trace_seq.c

tracing: Remove unused TRACE_SEQ_BUF_USED

2020-01-21 18:39:54 -05:00

trace_stack.c

trace: fix an incorrect __user annotation on stack_trace_sysctl

2020-06-08 10:13:56 -04:00

trace_stat.c

tracing: Fix tracing_stat return values in error handling paths

2020-01-24 18:06:48 -05:00

trace_stat.h

tracing: Use generic type for comparator function

2019-11-14 13:15:11 -05:00

trace_synth.h

tracing: Move synthetic events to a separate file

2020-06-01 08:23:22 -04:00

trace_syscalls.c

Merge tag 'trace-v5.6-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2020-02-06 07:12:11 +00:00

trace_uprobe.c

tracing/probe: Fix bpf_task_fd_query() for kprobes and uprobes

2020-06-09 11:10:12 -07:00

trace.c

tracing: Remove unused event variable in tracing_iter_reset

2020-06-16 21:21:03 -04:00

trace.h

tracing: Make ftrace packed events have align of 1

2020-06-16 21:21:02 -04:00

tracing_map.c

tracing: Convert local functions in tracing_map.c to static

2020-04-22 22:07:26 -04:00

tracing_map.h

…