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Sven Schnelle 500158df87 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 13:21:47 +01:00
..
blktrace.c
blktrace: Fix uaf in blk_trace access after removing by sysfs
2021-09-30 10:09:24 +02:00
bpf_trace.c
tracepoint: Add tracepoint_probe_register_may_exist() for BPF tracing
2021-07-14 16:53:08 +02:00
fgraph.c
fgraph: Initialize tracing_graph_pause at task creation
2021-02-10 09:25:29 +01:00
ftrace_internal.h
treewide: Rename rcu_dereference_raw_notrace() to _check()
2019-08-01 14:16:21 -07:00
ftrace.c
ftrace: add ftrace_init_nop()
2022-02-23 11:59:56 +01:00
Kconfig
tracing/kprobes: Do the notrace functions check without kprobes on ftrace
2021-01-19 18:26:12 +01:00
Makefile
…
power-traces.c
…
preemptirq_delay_test.c
…
ring_buffer_benchmark.c
tracing: Use CONFIG_PREEMPTION
2019-07-31 19:03:35 +02:00
ring_buffer.c
tracing: Fix bug in rb_per_cpu_empty() that might cause deadloop.
2021-07-28 13:31:00 +02:00
rpm-traces.c
…
trace_benchmark.c
…
trace_benchmark.h
…
trace_branch.c
x86/uaccess, ftrace: Fix ftrace_likely_update() vs. SMAP
2019-04-03 11:02:24 +02:00
trace_clock.c
tracing: Do no increment trace_clock_global() by one
2021-06-23 14:41:28 +02:00
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: Set kernel_stack's caller size properly
2020-10-01 13:17:29 +02:00
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
…
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/histogram: Fix sorting on old "cpu" value
2022-03-08 19:07:50 +01:00
trace_events_trigger.c
tracing: Have traceon and traceoff trigger honor the instance
2022-03-02 11:41:11 +01:00
trace_events.c
tracing: Check pid filtering when creating events
2021-12-01 09:23:34 +01:00
trace_export.c
…
trace_functions_graph.c
fgraph: Remove redundant ftrace_graph_notrace_addr() test
2019-07-30 21:50:03 -04:00
trace_functions.c
tracing: Have all levels of checks prevent recursion
2021-10-27 09:54:29 +02:00
trace_hwlat.c
tracing: Remove WARN_ON in start_thread()
2020-12-08 10:40:28 +01:00
trace_irqsoff.c
…
trace_kdb.c
tracing: Silence GCC 9 array bounds warning
2019-05-25 23:04:30 -04:00
trace_kprobe_selftest.c
…
trace_kprobe_selftest.h
…
trace_kprobe.c
tracing: Fix return value of __setup handlers
2022-03-08 19:07:50 +01:00
trace_mmiotrace.c
…
trace_nop.c
…
trace_output.c
tracing: Make the space reserved for the pid wider
2020-10-07 08:01:27 +02:00
trace_output.h
…
trace_preemptirq.c
lockdep: fix order in trace_hardirqs_off_caller()
2020-10-01 13:18:14 +02:00
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/probes: Reject events which have the same name of existing one
2021-09-22 12:26:43 +02:00
trace_probe.h
tracing/probes: Reject events which have the same name of existing one
2021-09-22 12:26:43 +02:00
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
ftrace: Handle tracing when switching between context
2020-11-10 12:37:28 +01:00
trace_seq.c
…
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
…
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/uprobe: Fix uprobe_perf_open probes iteration
2021-12-01 09:23:29 +01:00
trace.c
tracing: Ensure trace buffer is at least 4096 bytes large
2022-03-16 13:21:47 +01:00
trace.h
tracing: Fix pid filtering when triggers are attached
2021-12-01 09:23:29 +01:00
tracing_map.c
tracing: Fix a kmemleak false positive in tracing_map
2021-12-17 10:12:24 +01:00
tracing_map.h
…