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rcu: Turn off tracing before dumping trace

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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>
This commit is contained in:
Paul E. McKenney 2017-08-31 16:47:08 -07:00
parent 9b9500da81
commit 83b6ca1fed
1 changed files with 3 additions and 1 deletions
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4
kernel/rcu/rcu.h
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@ -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);