Commit 83b6ca1f authored Aug 31, 2017 by Paul E. McKenney

rcu: Turn off tracing before dumping trace

Currently, RCU allows tracing to continue when it automatically does
ftrace_dump() after detecting an error condition, which can result in
excessively large traces and lost trace events. This commit therefore
does a tracing_off() before any of these ftrace_dump() calls.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

parent 9b9500da

kernel/rcu/rcu.h

+3 −1

Original line number	Diff line number	Diff line
		@@ -220,8 +220,10 @@ do { \
		static atomic_t ___rfd_beenhere = ATOMIC_INIT(0); \
		\
		if (!atomic_read(&___rfd_beenhere) && \
		!atomic_xchg(&___rfd_beenhere, 1)) \
		!atomic_xchg(&___rfd_beenhere, 1)) { \
		tracing_off(); \
		ftrace_dump(oops_dump_mode); \
		} \
		} while (0)

		void rcu_early_boot_tests(void);