Steven Rostedt (VMware) b0db2f09db ring-buffer: Fix recursion protection transitions between interrupt context ...

[ Upstream commit b02414c8f0 ]

The recursion protection of the ring buffer depends on preempt_count() to be
correct. But it is possible that the ring buffer gets called after an
interrupt comes in but before it updates the preempt_count(). This will
trigger a false positive in the recursion code.

Use the same trick from the ftrace function callback recursion code which
uses a "transition" bit that gets set, to allow for a single recursion for
to handle transitions between contexts.

Cc: stable@vger.kernel.org
Fixes: 567cd4da54 ("ring-buffer: User context bit recursion checking")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2020-11-18 18:26:23 +01:00

..

blktrace.c

blktrace: break out of blktrace setup on concurrent calls

2020-06-30 15:38:43 -04:00

bpf_trace.c

bpf: fix check of allowed specifiers in bpf_trace_printk

2018-12-17 09:38:33 +01:00

ftrace.c

ftrace: Move RCU is watching check after recursion check

2020-10-14 09:48:15 +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: Remove unneeded smp_wmb() before wakeup of reader benchmark

2015-11-03 16:19:02 -05:00

ring_buffer.c

ring-buffer: Fix recursion protection transitions between interrupt context

2020-11-18 18:26:23 +01:00

rpm-traces.c

PM / Runtime: Introduce trace points for tracing rpm_* functions

2011-09-27 22:53:27 +02:00

trace_benchmark.c

tracing: Only benchmark the time tracepoints take if tracing is on

2015-11-02 13:34:58 -05:00

trace_benchmark.h

tracing: Add tracepoint benchmark tracepoint

2014-05-29 22:49:54 -04:00

trace_branch.c

tracing: Remove {start,stop}_branch_trace

2015-10-21 10:10:09 -04:00

trace_clock.c

tracing: Export tracing clock functions

2015-05-12 15:56:57 -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

tracing/filter: Add startup tests for events filter

2011-08-19 14:35:59 -04:00

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: Use strncpy instead of memcpy for string keys in hist triggers

2019-03-23 13:19:45 +01:00

trace_events_trigger.c

tracing: Fix event trigger to accept redundant spaces

2020-06-30 15:38:45 -04:00

trace_events.c

tracing: Adding NULL checks for trace_array descriptor pointer

2020-10-01 20:40:03 +02:00

trace_export.c

tracing: ftrace_event_is_function() can return boolean

2015-11-02 14:28:05 -05:00

trace_functions_graph.c

tracing: Fix missing return symbol in function_graph output

2018-07-11 16:26:43 +02:00

trace_functions.c

ftrace: Have set_ftrace_pid use the bitmap like events do

2016-06-20 09:54:19 -04:00

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

tracing: Turn seq_print_user_ip() into a static function

2015-09-28 10:16:12 -04:00

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

sched/core: Fix trace_sched_switch()

2015-10-06 17:08:15 +02:00

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

ftrace: Add self-tests for multiple function trace users

2011-05-18 19:24:51 -04:00

trace_selftest.c

ftrace: Handle tracing when switching between context

2020-11-10 10:24:02 +01:00

trace_seq.c

tracing: use %*pb[l] to print bitmaps including cpumasks and nodemasks

2015-02-13 21:21:37 -08:00

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

tracing/stat: Add stat_release() callback

2009-07-10 12:14:05 +02:00

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: Fix out of bounds write in get_trace_buf

2020-11-10 10:24:02 +01:00

trace.h

ftrace: Handle tracing when switching between context

2020-11-10 10:24:02 +01:00

tracing_map.c

tracing: Have the histogram compare functions convert to u64 first

2020-01-12 11:24:14 +01:00

tracing_map.h

tracing: Update some tracing_map constants and comments

2016-04-19 12:16:06 -04:00