Peter Zijlstra 56f9da8521 trace: Fix preempt_enable_no_resched() abuse ...

commit d6097c9e4454adf1f8f2c9547c2fa6060d55d952 upstream.

Unless the very next line is schedule(), or implies it, one must not use
preempt_enable_no_resched(). It can cause a preemption to go missing and
thereby cause arbitrary delays, breaking the PREEMPT=y invariant.

Link: http://lkml.kernel.org/r/20190423200318.GY14281@hirez.programming.kicks-ass.net

Cc: Waiman Long <longman@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: the arch/x86 maintainers <x86@kernel.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: huang ying <huang.ying.caritas@gmail.com>
Cc: Roman Gushchin <guro@fb.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: stable@vger.kernel.org
Fixes: 2c2d7329d8 ("tracing/ftrace: use preempt_enable_no_resched_notrace in ring_buffer_time_stamp()")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2019-05-02 09:32:00 +02:00

..

blktrace.c

tracing/blktrace: Fix to allow setting same value

2018-09-09 20:01:22 +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

kprobes: Mark ftrace mcount handler functions nokprobe

2019-04-27 09:34:44 +02:00

Kconfig

Merge tag 'trace-v4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2016-10-06 11:48:41 -07:00

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

trace: Fix preempt_enable_no_resched() abuse

2019-05-02 09:32:00 +02:00

rpm-traces.c

…

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

…

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: Add NMI tracing in hwlat detector

2016-09-02 12:47:55 -04:00

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: 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 memory leak in set_trigger_filter()

2018-12-21 14:11:31 +01:00

trace_events.c

tracing: Fix converting enum's from the map in trace_event_eval_update()

2018-01-23 19:57:07 +01:00

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: Fix hwlat kthread migration

2017-02-09 08:08:28 +01:00

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: kdb: Fix ftdump to not sleep

2019-04-05 22:29:05 +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

Merge tag 'trace-v4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2015-11-06 13:30:20 -08:00

trace_selftest_dynamic.c

…

trace_selftest.c

ftrace: Fix selftest goto location on error

2017-09-27 14:39:23 +02:00

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, kasan: Silence Kasan warning in check_stack of stack_tracer

2016-02-19 12:36:44 -05:00

trace_stat.c

kernel/...: convert pr_warning to pr_warn

2016-03-22 15:36:02 -07:00

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: Fix a memory leak by early error exit in trace_pid_write()

2019-05-02 09:32:00 +02:00

trace.h

ftrace: Fix function pid filter on instances

2017-04-21 09:31:22 +02:00

tracing_map.c

tracing: Fix kmemleak in tracing_map_array_free()

2017-08-30 10:21:49 +02:00

tracing_map.h

tracing: Update some tracing_map constants and comments

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