Linus Torvalds aaecdaf922 tracing/user_events: Remove RCU lock while pinning pages ... pin_user_pages_remote() can reschedule which means we cannot hold any RCU lock while using it. Now that enablers are not exposed out to the tracing register callbacks during fork(), there is clearly no need to require the RCU lock as event_mutex is enough to protect changes. Remove unneeded RCU usages when pinning pages and walking enablers with event_mutex held. Cleanup a misleading "safe" list walk that is not needed. During fork() duplication, remove unneeded RCU list add, since the list is not exposed yet. Link: https://lkml.kernel.org/r/20230519230741.669-3-beaub@linux.microsoft.com Link: https://lore.kernel.org/linux-trace-kernel/CAHk-=wiiBfT4zNS29jA0XEsy8EmbqTH1hAPdRJCDAJMD8Gxt5A@mail.gmail.com/ Fixes: 7235759084 ("tracing/user_events: Use remote writes for event enablement") Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> [ change log written by Beau Belgrave ] Signed-off-by: Beau Belgrave <beaub@linux.microsoft.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>		2023-05-23 21:05:04 -04:00
..
rv	tracing/tools: Updates for 6.4	2023-04-28 16:11:26 -07:00
blktrace.c	block: remove more NULL checks after bdev_get_queue()	2023-02-21 09:23:22 -07:00
bpf_trace.c	tracing updates for 6.4:	2023-04-28 15:57:53 -07:00
bpf_trace.h
error_report-traces.c
fgraph.c	arm64 fixes for 5.19-rc1:	2022-06-03 14:05:34 -07:00
fprobe.c	fprobe: add recursion detection in fprobe_exit_handler	2023-05-18 07:08:01 +09:00
ftrace_internal.h
ftrace.c	Minor tracing updates:	2023-05-05 13:11:02 -07:00
Kconfig	tracing: Unbreak user events	2023-03-29 06:52:09 -04:00
kprobe_event_gen_test.c	tracing: Fix wrong return in kprobe_event_gen_test.c	2023-03-19 12:20:48 -04:00
Makefile	rv: Add Runtime Verification (RV) interface	2022-07-30 14:01:28 -04:00
pid_list.c	tracing: Cleanup double word in comment	2022-04-26 17:58:50 -04:00
pid_list.h
power-traces.c
preemptirq_delay_test.c
rethook.c	rethook: use preempt_{disable, enable}_notrace in rethook_trampoline_handler	2023-05-18 07:08:01 +09:00
ring_buffer_benchmark.c	ring_buffer: Remove unused "event" parameter	2022-11-23 19:08:30 -05:00
ring_buffer.c	tracing updates for 6.4:	2023-04-28 15:57:53 -07:00
rpm-traces.c
synth_event_gen_test.c	tracing: Always use canonical ftrace path	2023-02-18 14:34:09 -05:00
trace_benchmark.c	tracing: Add numeric delta time to the trace event benchmark	2022-09-26 13:01:09 -04:00
trace_benchmark.h	tracing: Add numeric delta time to the trace event benchmark	2022-09-26 13:01:09 -04:00
trace_boot.c	tracing: Initialize integer variable to prevent garbage return value	2022-05-26 21:13:00 -04:00
trace_branch.c
trace_clock.c
trace_dynevent.c	tracing: Free buffers when a used dynamic event is removed	2022-11-23 19:07:12 -05:00
trace_dynevent.h
trace_entries.h
trace_eprobe.c	kernel/trace: extract common part in process_fetch_insn	2023-02-24 10:04:13 +09:00
trace_event_perf.c	tracing/perf: Use strndup_user instead of kzalloc/strncpy_from_user	2022-11-23 19:08:31 -05:00
trace_events_filter_test.h
trace_events_filter.c	tracing: Add a way to filter function addresses to function names	2023-01-25 10:31:11 -05:00
trace_events_hist.c	tracing: Check field value in hist_field_name()	2023-03-09 22:17:06 -05:00
trace_events_inject.c	tracing: Support __rel_loc relative dynamic data location attribute	2021-12-06 15:37:21 -05:00
trace_events_synth.c	tracing/synthetic: Make lastcmd_mutex static	2023-04-06 15:08:18 -04:00
trace_events_trigger.c	tracing: Do not synchronize freeing of trigger filter on boot up	2022-12-14 08:50:56 -05:00
trace_events_user.c	tracing/user_events: Remove RCU lock while pinning pages	2023-05-23 21:05:04 -04:00
trace_events.c	tracing updates for 6.3:	2023-02-23 10:20:49 -08:00
trace_export.c	tracing: Fix TASK_COMM_LEN in trace event format file	2023-02-12 10:23:39 -05:00
trace_functions_graph.c
trace_functions.c
trace_hwlat.c	tracing/hwlat: Replace sched_setaffinity with set_cpus_allowed_ptr	2023-03-19 13:23:22 -04:00
trace_irqsoff.c
trace_kdb.c
trace_kprobe_selftest.c
trace_kprobe_selftest.h
trace_kprobe.c	kernel/trace: extract common part in process_fetch_insn	2023-02-24 10:04:13 +09:00
trace_mmiotrace.c
trace_nop.c
trace_osnoise.c	tracing/timerlat: Always wakeup the timerlat thread	2023-05-23 11:54:31 -04:00
trace_output.c	tracing: Add missing spaces in trace_print_hex_seq()	2023-04-26 09:10:02 -04:00
trace_output.h	tracing: Add "fields" option to show raw trace event fields	2023-03-29 06:52:08 -04:00
trace_preemptirq.c	cpuidle: tracing, preempt: Squash _rcuidle tracing	2023-01-31 15:01:46 +01:00
trace_printk.c
trace_probe_kernel.h	kernel/trace: Provide default impelentations defined in trace_probe_tmpl.h	2023-02-24 09:44:27 +09:00
trace_probe_tmpl.h	kernel/trace: extract common part in process_fetch_insn	2023-02-24 10:04:13 +09:00
trace_probe.c	tracing: Rename kvfree_rcu() to kvfree_rcu_mightsleep()	2023-04-05 13:48:03 +00:00
trace_probe.h	kernel/trace: Introduce trace_probe_print_args and use it in *probes	2023-02-24 09:44:15 +09:00
trace_recursion_record.c	tracing: Use trace_create_file() to simplify creation of tracefs entries	2022-05-26 21:12:52 -04:00
trace_sched_switch.c	sched/tracing: Append prev_state to tp args instead	2022-05-12 00:37:11 +02:00
trace_sched_wakeup.c	sched/tracing: Append prev_state to tp args instead	2022-05-12 00:37:11 +02:00
trace_selftest_dynamic.c
trace_selftest.c	ftrace: selftest: remove broken trace_direct_tramp	2023-03-21 13:59:29 -04:00
trace_seq.c	tracing: Acquire buffer from temparary trace sequence	2023-02-07 12:42:54 -05:00
trace_stack.c
trace_stat.c
trace_stat.h
trace_synth.h	tracing: Allow synthetic events to pass around stacktraces	2023-01-25 10:31:24 -05:00
trace_syscalls.c	tracing: Remove unused __bad_type_size() method	2022-11-17 20:21:06 -05:00
trace_uprobe.c	kernel/trace: extract common part in process_fetch_insn	2023-02-24 10:04:13 +09:00
trace.c	Minor tracing updates:	2023-05-05 13:11:02 -07:00
trace.h	tracing: Add "fields" option to show raw trace event fields	2023-03-29 06:52:08 -04:00
tracing_map.c	tracing: Remove unused variable 'dups'	2022-10-03 12:20:31 -04:00
tracing_map.h