From b8989b76052eedc99b09322efd6f68816f191a1a Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Wed, 3 May 2017 12:28:59 -0700 Subject: 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 Signed-off-by: Paul E. McKenney --- kernel/rcu/rcu.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'kernel/rcu/rcu.h') diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h index 2f34466..cdbaa44 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); -- cgit v1.1