[PATCH 3/3] rcu: validate arguments for rcu tracepoints
From: Yafang Shao
Date: Mon Mar 25 2019 - 21:40:49 EST
When CONFIG_RCU_TRACE is not set, all these tracepoints are define as
do-nothing macro.
We'd better make those inline functions that take proper arguments.
As RCU_TRACE() is defined as do-nothing marco as well when
CONFIG_RCU_TRACE is not set, so we can clean it up.
Signed-off-by: Yafang Shao <laoar.shao@xxxxxxxxx>
---
include/trace/events/rcu.h | 84 +++++++++++++++++++++++++++++-----------------
kernel/rcu/rcu.h | 9 ++---
kernel/rcu/tree.c | 8 ++---
3 files changed, 60 insertions(+), 41 deletions(-)
diff --git a/include/trace/events/rcu.h b/include/trace/events/rcu.h
index f0c4d10..357e1b6 100644
--- a/include/trace/events/rcu.h
+++ b/include/trace/events/rcu.h
@@ -750,36 +750,60 @@
#else /* #ifdef CONFIG_RCU_TRACE */
-#define trace_rcu_grace_period(rcuname, gp_seq, gpevent) do { } while (0)
-#define trace_rcu_future_grace_period(rcuname, gp_seq, gp_seq_req, \
- level, grplo, grphi, event) \
- do { } while (0)
-#define trace_rcu_grace_period_init(rcuname, gp_seq, level, grplo, grphi, \
- qsmask) do { } while (0)
-#define trace_rcu_exp_grace_period(rcuname, gqseq, gpevent) \
- do { } while (0)
-#define trace_rcu_exp_funnel_lock(rcuname, level, grplo, grphi, gpevent) \
- do { } while (0)
-#define trace_rcu_nocb_wake(rcuname, cpu, reason) do { } while (0)
-#define trace_rcu_preempt_task(rcuname, pid, gp_seq) do { } while (0)
-#define trace_rcu_unlock_preempted_task(rcuname, gp_seq, pid) do { } while (0)
-#define trace_rcu_quiescent_state_report(rcuname, gp_seq, mask, qsmask, level, \
- grplo, grphi, gp_tasks) do { } \
- while (0)
-#define trace_rcu_fqs(rcuname, gp_seq, cpu, qsevent) do { } while (0)
-#define trace_rcu_dyntick(polarity, oldnesting, newnesting, dyntick) do { } while (0)
-#define trace_rcu_callback(rcuname, rhp, qlen_lazy, qlen) do { } while (0)
-#define trace_rcu_kfree_callback(rcuname, rhp, offset, qlen_lazy, qlen) \
- do { } while (0)
-#define trace_rcu_batch_start(rcuname, qlen_lazy, qlen, blimit) \
- do { } while (0)
-#define trace_rcu_invoke_callback(rcuname, rhp) do { } while (0)
-#define trace_rcu_invoke_kfree_callback(rcuname, rhp, offset) do { } while (0)
-#define trace_rcu_batch_end(rcuname, callbacks_invoked, cb, nr, iit, risk) \
- do { } while (0)
-#define trace_rcu_torture_read(rcutorturename, rhp, secs, c_old, c) \
- do { } while (0)
-#define trace_rcu_barrier(name, s, cpu, cnt, done) do { } while (0)
+TRACE_EVENT_NONE(rcu_grace_period,
+ TP_PROTO(const char *rcuname, unsigned long gp_seq,
+ const char *gpevent));
+TRACE_EVENT_NONE(rcu_future_grace_period,
+ TP_PROTO(const char *rcuname, unsigned long gp_seq,
+ unsigned long gp_seq_req, u8 level, int grplo,
+ int grphi, const char *gpevent));
+TRACE_EVENT_NONE(rcu_grace_period_init,
+ TP_PROTO(const char *rcuname, unsigned long gp_seq, u8 level,
+ int grplo, int grphi, unsigned long qsmask));
+TRACE_EVENT_NONE(rcu_exp_grace_period,
+ TP_PROTO(const char *rcuname, unsigned long gpseq,
+ const char *gpevent));
+TRACE_EVENT_NONE(rcu_exp_funnel_lock,
+ TP_PROTO(const char *rcuname, u8 level, int grplo, int grphi,
+ const char *gpevent));
+TRACE_EVENT_NONE(rcu_nocb_wake,
+ TP_PROTO(const char *rcuname, int cpu, const char *reason));
+TRACE_EVENT_NONE(rcu_preempt_task,
+ TP_PROTO(const char *rcuname, int pid, unsigned long gp_seq));
+TRACE_EVENT_NONE(rcu_unlock_preempted_task,
+ TP_PROTO(const char *rcuname, unsigned long gp_seq, int pid));
+TRACE_EVENT_NONE(rcu_quiescent_state_report,
+ TP_PROTO(const char *rcuname, unsigned long gp_seq,
+ unsigned long mask, unsigned long qsmask,
+ u8 level, int grplo, int grphi, int gp_tasks));
+TRACE_EVENT_NONE(rcu_fqs,
+ TP_PROTO(const char *rcuname, unsigned long gp_seq, int cpu,
+ const char *qsevent));
+TRACE_EVENT_NONE(rcu_dyntick,
+ TP_PROTO(const char *polarity, long oldnesting, long newnesting,
+ atomic_t dynticks));
+TRACE_EVENT_NONE(rcu_callback,
+ TP_PROTO(const char *rcuname, struct rcu_head *rhp, long qlen_lazy,
+ long qlen));
+TRACE_EVENT_NONE(rcu_kfree_callback,
+ TP_PROTO(const char *rcuname, struct rcu_head *rhp,
+ unsigned long offset, long qlen_lazy, long qlen));
+TRACE_EVENT_NONE(rcu_batch_start,
+ TP_PROTO(const char *rcuname, long qlen_lazy, long qlen, long blimit));
+TRACE_EVENT_NONE(rcu_invoke_callback,
+ TP_PROTO(const char *rcuname, struct rcu_head *rhp));
+TRACE_EVENT_NONE(rcu_invoke_kfree_callback,
+ TP_PROTO(const char *rcuname, struct rcu_head *rhp,
+ unsigned long offset));
+TRACE_EVENT_NONE(rcu_batch_end,
+ TP_PROTO(const char *rcuname, int callbacks_invoked,
+ char cb, char nr, char iit, char risk));
+TRACE_EVENT_NONE(rcu_torture_read,
+ TP_PROTO(const char *rcutorturename, struct rcu_head *rhp,
+ unsigned long secs, unsigned long c_old, unsigned long c));
+TRACE_EVENT_NONE(rcu_barrier,
+ TP_PROTO(const char *rcuname, const char *s, int cpu, int cnt,
+ unsigned long done));
#endif /* #else #ifdef CONFIG_RCU_TRACE */
diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h
index a393e24..2778e44 100644
--- a/kernel/rcu/rcu.h
+++ b/kernel/rcu/rcu.h
@@ -24,11 +24,6 @@
#define __LINUX_RCU_H
#include <trace/events/rcu.h>
-#ifdef CONFIG_RCU_TRACE
-#define RCU_TRACE(stmt) stmt
-#else /* #ifdef CONFIG_RCU_TRACE */
-#define RCU_TRACE(stmt)
-#endif /* #else #ifdef CONFIG_RCU_TRACE */
/* Offset to allow for unmatched rcu_irq_{enter,exit}(). */
#define DYNTICK_IRQ_NONIDLE ((LONG_MAX / 2) + 1)
@@ -229,12 +224,12 @@ static inline bool __rcu_reclaim(const char *rn, struct rcu_head *head)
rcu_lock_acquire(&rcu_callback_map);
if (__is_kfree_rcu_offset(offset)) {
- RCU_TRACE(trace_rcu_invoke_kfree_callback(rn, head, offset);)
+ trace_rcu_invoke_kfree_callback(rn, head, offset);
kfree((void *)head - offset);
rcu_lock_release(&rcu_callback_map);
return true;
} else {
- RCU_TRACE(trace_rcu_invoke_callback(rn, head);)
+ trace_rcu_invoke_callback(rn, head);
f = head->func;
WRITE_ONCE(head->func, (rcu_callback_t)0L);
f(head);
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 9180158..d2ad39f 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2329,14 +2329,14 @@ static void rcu_report_qs_rnp(unsigned long mask, struct rcu_node *rnp,
*/
int rcutree_dying_cpu(unsigned int cpu)
{
- RCU_TRACE(bool blkd;)
- RCU_TRACE(struct rcu_data *rdp = this_cpu_ptr(&rcu_data);)
- RCU_TRACE(struct rcu_node *rnp = rdp->mynode;)
+ bool blkd;
+ struct rcu_data *rdp = this_cpu_ptr(&rcu_data);
+ struct rcu_node *rnp = rdp->mynode;
if (!IS_ENABLED(CONFIG_HOTPLUG_CPU))
return 0;
- RCU_TRACE(blkd = !!(rnp->qsmask & rdp->grpmask);)
+ blkd = !!(rnp->qsmask & rdp->grpmask);
trace_rcu_grace_period(rcu_state.name, rnp->gp_seq,
blkd ? TPS("cpuofl") : TPS("cpuofl-bgp"));
return 0;
--
1.8.3.1