Commit-ID: 83b6ca1fede773eebcdfb44f5a94eb410d48b886
Gitweb: https://git.kernel.org/tip/83b6ca1fede773eebcdfb44f5a94eb410d48b886
Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
AuthorDate: Thu, 31 Aug 2017 16:47:08 -0700
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CommitDate: Mon, 9 Oct 2017 14:25:17 -0700
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@xxxxxxxxxxxxxxxxxx>
---
kernel/rcu/rcu.h | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h
index e4b43fe..b8729eb 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);
--
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