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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2017-05-03 12:28:59 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2017-06-08 18:52:32 -0700
commitb8989b76052eedc99b09322efd6f68816f191a1a (patch)
tree0f31be2cadab883f337ce9468aa69d1ba8dfdc36 /kernel/rcu
parent3d54f7983f3e6ac9f444fa20970b1abc8f089b79 (diff)
downloadlinux-b8989b76052eedc99b09322efd6f68816f191a1a.tar.bz2
rcu: Move rcu_ftrace_dump() from rcupdate.h to rcu.h
The rcu_ftrace_dump() function is used only internally to RCU. This commit therefore moves its declaration from include/linux/rcupdate.h to kernel/rcu/rcu.h. Reported-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu')
-rw-r--r--kernel/rcu/rcu.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h
index 2f344662c568..cdbaa441bdac 100644
--- a/kernel/rcu/rcu.h
+++ b/kernel/rcu/rcu.h
@@ -212,6 +212,18 @@ int rcu_jiffies_till_stall_check(void);
*/
#define TPS(x) tracepoint_string(x)
+/*
+ * Dump the ftrace buffer, but only one time per callsite per boot.
+ */
+#define rcu_ftrace_dump(oops_dump_mode) \
+do { \
+ static atomic_t ___rfd_beenhere = ATOMIC_INIT(0); \
+ \
+ if (!atomic_read(&___rfd_beenhere) && \
+ !atomic_xchg(&___rfd_beenhere, 1)) \
+ ftrace_dump(oops_dump_mode); \
+} while (0)
+
void rcu_early_boot_tests(void);
void rcu_test_sync_prims(void);