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rcu: Add TPS() protection for _rcu_barrier_trace strings 

The _rcu_barrier_trace() function is a wrapper for trace_rcu_barrier(),
which needs TPS() protection for strings passed through the second
argument.  However, it has escaped prior TPS()-ification efforts because
it _rcu_barrier_trace() does not start with "trace_".  This commit
therefore adds the needed TPS() protection

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Paul E. McKenney 2017-06-27 13:22:17 -07:00
parent d5374226c3
commit d8db2e86d8
1 changed files with 15 additions and 12 deletions
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27
kernel/rcu/tree.c
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@ -3568,10 +3568,11 @@ static void rcu_barrier_callback(struct rcu_head *rhp)
struct rcu_state *rsp = rdp->rsp;
if (atomic_dec_and_test(&rsp->barrier_cpu_count)) {
_rcu_barrier_trace(rsp, "LastCB", -1, rsp->barrier_sequence);
_rcu_barrier_trace(rsp, TPS("LastCB"), -1,
rsp->barrier_sequence);
complete(&rsp->barrier_completion);
} else {
_rcu_barrier_trace(rsp, "CB", -1, rsp->barrier_sequence);
_rcu_barrier_trace(rsp, TPS("CB"), -1, rsp->barrier_sequence);
}
}
@ -3583,14 +3584,15 @@ static void rcu_barrier_func(void *type)
struct rcu_state *rsp = type;
struct rcu_data *rdp = raw_cpu_ptr(rsp->rda);
_rcu_barrier_trace(rsp, "IRQ", -1, rsp->barrier_sequence);
_rcu_barrier_trace(rsp, TPS("IRQ"), -1, rsp->barrier_sequence);
rdp->barrier_head.func = rcu_barrier_callback;
debug_rcu_head_queue(&rdp->barrier_head);
if (rcu_segcblist_entrain(&rdp->cblist, &rdp->barrier_head, 0)) {
atomic_inc(&rsp->barrier_cpu_count);
} else {
debug_rcu_head_unqueue(&rdp->barrier_head);
_rcu_barrier_trace(rsp, "IRQNQ", -1, rsp->barrier_sequence);
_rcu_barrier_trace(rsp, TPS("IRQNQ"), -1,
rsp->barrier_sequence);
}
}
@ -3604,14 +3606,15 @@ static void _rcu_barrier(struct rcu_state *rsp)
struct rcu_data *rdp;
unsigned long s = rcu_seq_snap(&rsp->barrier_sequence);
_rcu_barrier_trace(rsp, "Begin", -1, s);
_rcu_barrier_trace(rsp, TPS("Begin"), -1, s);
/* Take mutex to serialize concurrent rcu_barrier() requests. */
mutex_lock(&rsp->barrier_mutex);
/* Did someone else do our work for us? */
if (rcu_seq_done(&rsp->barrier_sequence, s)) {
_rcu_barrier_trace(rsp, "EarlyExit", -1, rsp->barrier_sequence);
_rcu_barrier_trace(rsp, TPS("EarlyExit"), -1,
rsp->barrier_sequence);
smp_mb(); /* caller's subsequent code after above check. */
mutex_unlock(&rsp->barrier_mutex);
return;
@ -3619,7 +3622,7 @@ static void _rcu_barrier(struct rcu_state *rsp)
/* Mark the start of the barrier operation. */
rcu_seq_start(&rsp->barrier_sequence);
_rcu_barrier_trace(rsp, "Inc1", -1, rsp->barrier_sequence);
_rcu_barrier_trace(rsp, TPS("Inc1"), -1, rsp->barrier_sequence);
/*
* Initialize the count to one rather than to zero in order to
@ -3642,10 +3645,10 @@ static void _rcu_barrier(struct rcu_state *rsp)
rdp = per_cpu_ptr(rsp->rda, cpu);
if (rcu_is_nocb_cpu(cpu)) {
if (!rcu_nocb_cpu_needs_barrier(rsp, cpu)) {
_rcu_barrier_trace(rsp, "OfflineNoCB", cpu,
_rcu_barrier_trace(rsp, TPS("OfflineNoCB"), cpu,
rsp->barrier_sequence);
} else {
_rcu_barrier_trace(rsp, "OnlineNoCB", cpu,
_rcu_barrier_trace(rsp, TPS("OnlineNoCB"), cpu,
rsp->barrier_sequence);
smp_mb__before_atomic();
atomic_inc(&rsp->barrier_cpu_count);
@ -3653,11 +3656,11 @@ static void _rcu_barrier(struct rcu_state *rsp)
rcu_barrier_callback, rsp, cpu, 0);
}
} else if (rcu_segcblist_n_cbs(&rdp->cblist)) {
_rcu_barrier_trace(rsp, "OnlineQ", cpu,
_rcu_barrier_trace(rsp, TPS("OnlineQ"), cpu,
rsp->barrier_sequence);
smp_call_function_single(cpu, rcu_barrier_func, rsp, 1);
} else {
_rcu_barrier_trace(rsp, "OnlineNQ", cpu,
_rcu_barrier_trace(rsp, TPS("OnlineNQ"), cpu,
rsp->barrier_sequence);
}
}
@ -3674,7 +3677,7 @@ static void _rcu_barrier(struct rcu_state *rsp)
wait_for_completion(&rsp->barrier_completion);
/* Mark the end of the barrier operation. */
_rcu_barrier_trace(rsp, "Inc2", -1, rsp->barrier_sequence);
_rcu_barrier_trace(rsp, TPS("Inc2"), -1, rsp->barrier_sequence);
rcu_seq_end(&rsp->barrier_sequence);
/* Other rcu_barrier() invocations can now safely proceed. */