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ftrace: Prevent RCU stall on PREEMPT_VOLUNTARY kernels
The function match_records() may take a while due to a large number of string comparisons, so when in PREEMPT_VOLUNTARY kernels we could face RCU stalls due to that. Add a cond_resched() to prevent that. Link: https://lkml.kernel.org/r/20221115204847.593616-1-gpiccoli@igalia.com Cc: Mark Rutland <mark.rutland@arm.com> Suggested-by: Steven Rostedt <rostedt@goodmis.org> Acked-by: Paul E. McKenney <paulmck@kernel.org> # from RCU CPU stall warning perspective Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com> Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
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@ -4204,6 +4204,7 @@ match_records(struct ftrace_hash *hash, char *func, int len, char *mod)
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}
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found = 1;
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}
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cond_resched();
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} while_for_each_ftrace_rec();
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out_unlock:
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mutex_unlock(&ftrace_lock);
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