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Sven Schnelle e362311c8c 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 13:20:27 +01:00
..
blktrace.c
blktrace: Fix uaf in blk_trace access after removing by sysfs
2021-10-06 15:31:15 +02:00
bpf_trace.c
tracepoint: Add tracepoint_probe_register_may_exist() for BPF tracing
2021-07-20 16:15:42 +02:00
ftrace.c
tracing: Have all levels of checks prevent recursion
2021-10-27 09:53:15 +02:00
Kconfig
tracing/kprobes: Do the notrace functions check without kprobes on ftrace
2021-01-19 18:22:35 +01:00
Makefile
tracing: Allow gcov profiling on only ftrace subsystem
2018-08-21 09:11:49 -04:00
power-traces.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
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: Add SPDX License format tags to tracing files
2018-08-16 19:08:06 -04:00
ring_buffer.c
tracing: Fix bug in rb_per_cpu_empty() that might cause deadloop.
2021-07-28 11:13:50 +02:00
rpm-traces.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
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
Revert "x86/uaccess, ftrace: Fix ftrace_likely_update() vs. SMAP"
2019-07-03 13:14:41 +02:00
trace_clock.c
tracing: Do no increment trace_clock_global() by one
2021-06-30 08:48:23 -04:00
trace_entries.h
tracing: Set kernel_stack's caller size properly
2020-10-01 13:14:31 +02:00
trace_event_perf.c
tracing: Fix race in perf_trace_buf initialization
2019-10-29 09:20:03 +01:00
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: Have error path in predicate_parse() free its allocated memory
2020-08-05 10:05:59 +02:00
trace_events_hist.c
tracing/histogram: Fix sorting on old "cpu" value
2022-03-08 19:04:10 +01:00
trace_events_trigger.c
tracing: Have traceon and traceoff trigger honor the instance
2022-03-02 11:38:15 +01:00
trace_events.c
tracing: Check pid filtering when creating events
2021-12-01 09:27:43 +01:00
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
tracing/fgraph: Fix set_graph_function from showing interrupts
2018-12-08 12:59:07 +01:00
trace_functions.c
tracing: Have all levels of checks prevent recursion
2021-10-27 09:53:15 +02:00
trace_hwlat.c
tracing: Remove WARN_ON in start_thread()
2020-12-08 10:18:55 +01:00
trace_irqsoff.c
tracing/fgraph: Fix set_graph_function from showing interrupts
2018-12-08 12:59:07 +01:00
trace_kdb.c
tracing: Silence GCC 9 array bounds warning
2019-06-25 11:35:52 +08:00
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/kprobe: Fix kprobe_on_func_entry() modification
2021-09-26 13:39:47 +02:00
trace_mmiotrace.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_nop.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_output.c
tracing: Add SPDX License format tags to tracing files
2018-08-16 19:08:06 -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
lockdep: fix order in trace_hardirqs_off_caller()
2020-10-01 13:14:50 +02:00
trace_printk.c
tracing: Add SPDX License format tags to tracing files
2018-08-16 19:08:06 -04:00
trace_probe.c
tracing: Add SPDX License format tags to tracing files
2018-08-16 19:08:06 -04:00
trace_probe.h
tracing: Add SPDX License format tags to tracing files
2018-08-16 19:08:06 -04:00
trace_sched_switch.c
tracing: Fix sched switch start/stop refcount racy updates
2020-02-11 04:33:55 -08:00
trace_sched_wakeup.c
kernel/trace: Fix do not unregister tracepoints when register sched_migrate_task fail
2020-01-14 20:06:59 +01:00
trace_selftest_dynamic.c
ftrace: Mark function tracer test functions noinline/noclone
2018-01-23 15:57:29 -05:00
trace_selftest.c
ftrace: Handle tracing when switching between context
2020-11-10 12:35:58 +01:00
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 20:06:59 +01:00
trace_stat.c
tracing: Fix very unlikely race of registering two stat tracers
2020-02-24 08:34:39 +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
Tracing updates for 4.15:
2017-11-17 14:58:01 -08:00
trace_uprobe.c
tracing/uprobes: Fix output for multiple string arguments
2019-02-20 10:25:48 +01:00
trace.c
tracing: Ensure trace buffer is at least 4096 bytes large
2022-03-16 13:20:27 +01:00
trace.h
tracing: Fix pid filtering when triggers are attached
2021-12-01 09:27:39 +01:00
tracing_map.c
tracing: Fix a kmemleak false positive in tracing_map
2021-12-22 09:19:00 +01:00
tracing_map.h
tracing: Fix SPDX format headers to use C++ style comments
2018-08-16 19:08:06 -04:00