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Sven Schnelle 8d276f10e8 tracing: Ensure trace buffer is at least 4096 bytes large 
[ Upstream commit 7acf3a127bb7c65ff39099afd78960e77b2ca5de ]

Booting the kernel with 'trace_buf_size=1' give a warning at
boot during the ftrace selftests:

[    0.892809] Running postponed tracer tests:
[    0.892893] Testing tracer function:
[    0.901899] Callback from call_rcu_tasks_trace() invoked.
[    0.983829] Callback from call_rcu_tasks_rude() invoked.
[    1.072003] .. bad ring buffer .. corrupted trace buffer ..
[    1.091944] Callback from call_rcu_tasks() invoked.
[    1.097695] PASSED
[    1.097701] Testing dynamic ftrace: .. filter failed count=0 ..FAILED!
[    1.353474] ------------[ cut here ]------------
[    1.353478] WARNING: CPU: 0 PID: 1 at kernel/trace/trace.c:1951 run_tracer_selftest+0x13c/0x1b0

Therefore enforce a minimum of 4096 bytes to make the selftest pass.

Link: https://lkml.kernel.org/r/20220214134456.1751749-1-svens@linux.ibm.com

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-03-16 14:16:00 +01:00
..
blktrace.c
blktrace: Fix uaf in blk_trace access after removing by sysfs
2021-09-30 10:11:05 +02:00
bpf_trace.c
bpf: Remove config check to enable bpf support for branch records
2022-01-27 10:53:54 +01:00
bpf_trace.h
bpf: Use dedicated bpf_trace_printk event instead of trace_printk()
2020-07-13 16:55:49 -07:00
fgraph.c
fgraph: Initialize tracing_graph_pause at task creation
2021-02-10 09:29:16 +01:00
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
tracing: Have all levels of checks prevent recursion
2021-10-27 09:56:56 +02:00
Kconfig
tracing/kprobes: Do the notrace functions check without kprobes on ftrace
2021-01-19 18:27:19 +01:00
kprobe_event_gen_test.c
tracing: Add kprobe event command generation test module
2020-01-30 09:46:28 -05:00
Makefile
Kbuild updates for v5.9
2020-08-09 14:10:26 -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
sched,tracing: Convert to sched_set_fifo()
2020-07-29 11:43:53 +02:00
ring_buffer.c
ring-buffer: Protect ring_buffer_reset() from reentrancy
2021-11-18 14:03:49 +01:00
rpm-traces.c
…
synth_event_gen_test.c
tracing: Add support for dynamic strings to synthetic events
2020-10-05 19:32:18 -04:00
trace_benchmark.c
…
trace_benchmark.h
…
trace_boot.c
tracing/boot: Fix a hist trigger dependency for boot time tracing
2021-09-22 12:28:03 +02:00
trace_branch.c
…
trace_clock.c
tracing: Do no increment trace_clock_global() by one
2021-06-23 14:42:50 +02:00
trace_dynevent.c
tracing: Delete repeated words in comments
2020-09-21 21:06:02 -04:00
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
…
trace_events_filter.c
tracing: Add ustring operation to filtering string pointers
2022-03-08 19:09:31 +01:00
trace_events_hist.c
tracing/histogram: Fix sorting on old "cpu" value
2022-03-08 19:09:38 +01:00
trace_events_inject.c
…
trace_events_synth.c
tracing: Make -ENOMEM the default error for parse_synth_field()
2020-11-02 15:58:32 -05:00
trace_events_trigger.c
tracing: Have traceon and traceoff trigger honor the instance
2022-03-02 11:42:53 +01:00
trace_events.c
tracing: Check pid filtering when creating events
2021-12-01 09:19:09 +01:00
trace_export.c
treewide: Convert macro and uses of __section(foo) to __section("foo")
2020-10-25 14:51:49 -07:00
trace_functions_graph.c
tracing: make tracing_init_dentry() returns an integer instead of a d_entry pointer
2020-09-18 22:17:14 -04:00
trace_functions.c
tracing: Have all levels of checks prevent recursion
2021-10-27 09:56:56 +02:00
trace_hwlat.c
tracing: Remove WARN_ON in start_thread()
2020-11-30 21:43:07 -05:00
trace_irqsoff.c
tracing: Use pause-on-trace with the latency tracers
2021-02-10 09:29:16 +01:00
trace_kdb.c
…
trace_kprobe_selftest.c
…
trace_kprobe_selftest.h
…
trace_kprobe.c
tracing: Fix return value of __setup handlers
2022-03-08 19:09:38 +01:00
trace_mmiotrace.c
…
trace_nop.c
…
trace_output.c
tracing: Make the space reserved for the pid wider
2020-09-18 12:42:11 -04:00
trace_output.h
…
trace_preemptirq.c
lockdep: fix order in trace_hardirqs_off_caller()
2020-09-14 10:08:07 +02:00
trace_printk.c
Updates for tracing and bootconfig:
2020-10-15 15:51:28 -07:00
trace_probe_tmpl.h
…
trace_probe.c
tracing/probes: Reject events which have the same name of existing one
2021-09-22 12:28:00 +02:00
trace_probe.h
tracing/probes: Reject events which have the same name of existing one
2021-09-22 12:28:00 +02:00
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
…
trace_selftest_dynamic.c
…
trace_selftest.c
tracing: Disable ftrace selftests when any tracer is running
2020-12-30 11:54:28 +01:00
trace_seq.c
tracing: Remove unused TRACE_SEQ_BUF_USED
2020-01-21 18:39:54 -05:00
trace_stack.c
tracing: make tracing_init_dentry() returns an integer instead of a d_entry pointer
2020-09-18 22:17:14 -04:00
trace_stat.c
tracing: make tracing_init_dentry() returns an integer instead of a d_entry pointer
2020-09-18 22:17:14 -04:00
trace_stat.h
…
trace_synth.h
tracing: Synthetic event field_pos is an index not a boolean
2021-07-28 14:35:45 +02:00
trace_syscalls.c
Tracing updates:
2020-02-06 07:12:11 +00:00
trace_uprobe.c
tracing/uprobe: Fix uprobe_perf_open probes iteration
2021-12-01 09:19:01 +01:00
trace.c
tracing: Ensure trace buffer is at least 4096 bytes large
2022-03-16 14:16:00 +01:00
trace.h
tracing: Fix pid filtering when triggers are attached
2021-12-01 09:19:01 +01:00
tracing_map.c
tracing: Fix a kmemleak false positive in tracing_map
2021-12-17 10:14:40 +01:00
tracing_map.h
…