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Sven Schnelle 2f8ee5379b 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 12:49:01 +01:00
..
blktrace.c
blktrace: Fix uaf in blk_trace access after removing by sysfs
2021-10-06 10:23:40 +02:00
bpf_trace.c
bpf: fix check of allowed specifiers in bpf_trace_printk
2018-12-17 09:38:33 +01:00
ftrace.c
tracing: Have all levels of checks prevent recursion
2021-10-27 09:34:01 +02:00
Kconfig
Stop the ad-hoc games with -Wno-maybe-initialized
2020-05-20 08:15:37 +02:00
Makefile
Disable the __builtin_return_address() warning globally after all
2016-10-12 10:23:41 -07:00
power-traces.c
cpufreq: schedutil: New governor based on scheduler utilization data
2016-04-02 01:09:12 +02:00
ring_buffer_benchmark.c
…
ring_buffer.c
tracing: Fix bug in rb_per_cpu_empty() that might cause deadloop.
2021-07-28 09:14:28 +02:00
rpm-traces.c
…
trace_benchmark.c
…
trace_benchmark.h
…
trace_branch.c
…
trace_clock.c
tracing: Do no increment trace_clock_global() by one
2021-06-30 08:49:17 -04:00
trace_entries.h
tracing: Set kernel_stack's caller size properly
2020-10-01 20:40:05 +02:00
trace_event_perf.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
2016-05-17 16:26:30 -07:00
trace_events_filter_test.h
…
trace_events_filter.c
tracing: Fix regex_match_front() to not over compare the test string
2018-05-16 10:08:43 +02:00
trace_events_hist.c
tracing: Do not reference char * as a string in histograms
2021-07-20 16:21:11 +02:00
trace_events_trigger.c
tracing: Fix event trigger to accept redundant spaces
2020-06-30 15:38:45 -04:00
trace_events.c
tracing: Check pid filtering when creating events
2021-12-08 08:45:03 +01:00
trace_export.c
…
trace_functions_graph.c
tracing: Fix missing return symbol in function_graph output
2018-07-11 16:26:43 +02:00
trace_functions.c
tracing: Have all levels of checks prevent recursion
2021-10-27 09:34:01 +02:00
trace_hwlat.c
tracing/hwlat: Honor the tracing_cpumask
2020-08-26 10:29:03 +02:00
trace_irqsoff.c
tracing: Remove redundant reset per-CPU buff in irqsoff tracer
2016-03-18 16:39:11 -04:00
trace_kdb.c
tracing: Silence GCC 9 array bounds warning
2019-07-10 09:55:28 +02:00
trace_kprobe.c
tracing: Quiet gcc warning about maybe unused link variable
2018-08-03 07:55:12 +02:00
trace_mmiotrace.c
tracing: Expose CPU physical addresses (resource values) for PCI devices
2016-06-20 09:54:22 -04:00
trace_nop.c
tracing: Fix typoes in code comment and printk in trace_nop.c
2016-03-08 11:23:57 -05:00
trace_output.c
tracing: Add NMI tracing in hwlat detector
2016-09-02 12:47:55 -04:00
trace_output.h
…
trace_printk.c
tracing: Handle NULL formats in hold_module_trace_bprintk_format()
2016-06-20 09:46:12 -04:00
trace_probe.c
tracing: probeevent: Fix to support minus offset from symbol
2018-03-28 18:39:23 +02:00
trace_probe.h
tracing: probeevent: Fix to support minus offset from symbol
2018-03-28 18:39:23 +02:00
trace_sched_switch.c
…
trace_sched_wakeup.c
kernel/trace: Fix do not unregister tracepoints when register sched_migrate_task fail
2020-01-14 20:04:26 +01:00
trace_selftest_dynamic.c
…
trace_selftest.c
ftrace: Handle tracing when switching between context
2020-11-10 10:24:02 +01:00
trace_seq.c
…
trace_stack.c
tracing: Have stack tracer compile when MCOUNT_INSN_SIZE is not defined
2020-01-14 20:04:26 +01:00
trace_stat.c
tracing: Fix very unlikely race of registering two stat tracers
2020-02-28 15:42:21 +01:00
trace_stat.h
…
trace_syscalls.c
tracing/syscalls: fix multiline in error message text
2016-09-29 10:25:23 +02:00
trace_uprobe.c
tracing/uprobes: Fix output for multiple string arguments
2019-02-20 10:18:32 +01:00
trace.c
tracing: Ensure trace buffer is at least 4096 bytes large
2022-03-16 12:49:01 +01:00
trace.h
tracing: Fix pid filtering when triggers are attached
2021-12-08 08:45:03 +01:00
tracing_map.c
tracing: Fix a kmemleak false positive in tracing_map
2021-12-22 09:05:13 +01:00
tracing_map.h
tracing: Update some tracing_map constants and comments
2016-04-19 12:16:06 -04:00