https://github.com/torvalds/linux
Revision 685b64e4d6da4be8b4595654a57db663b3d1dfc2 authored by Chuang Wang on 27 December 2022, 02:30:36 UTC, committed by Steven Rostedt (Google) on 24 January 2023, 23:11:41 UTC
list_for_each_entry_rcu() has built-in RCU and lock checking.

Pass cond argument to list_for_each_entry_rcu() to silence false lockdep
warning when CONFIG_PROVE_RCU_LIST is enabled.

Execute as follow:

 [tracing]# echo osnoise > current_tracer
 [tracing]# echo 1 > tracing_on
 [tracing]# echo 0 > tracing_on

The trace_types_lock is held when osnoise_tracer_stop() or
timerlat_tracer_stop() are called in the non-RCU read side section.
So, pass lockdep_is_held(&trace_types_lock) to silence false lockdep
warning.

Link: https://lkml.kernel.org/r/20221227023036.784337-1-nashuiliang@gmail.com

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Fixes: dae181349f1e ("tracing/osnoise: Support a list of trace_array *tr")
Acked-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Chuang Wang <nashuiliang@gmail.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
1 parent ac28d0a
History
Tip revision: 685b64e4d6da4be8b4595654a57db663b3d1dfc2 authored by Chuang Wang on 27 December 2022, 02:30:36 UTC
tracing/osnoise: Use built-in RCU list checking
Tip revision: 685b64e
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