From 83b6ca1fede773eebcdfb44f5a94eb410d48b886 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Thu, 31 Aug 2017 16:47:08 -0700 Subject: 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 --- kernel/rcu/rcu.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'kernel/rcu') diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h index e4b43fef89f5..b8729eb09a5d 100644 --- a/kernel/rcu/rcu.h +++ b/kernel/rcu/rcu.h @@ -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); -- cgit v1.2.3