[PATCH tip/core/rcu 5/8] rcutorture: Print symbolic name for rcu_torture_writer_state

Paul E. McKenney
2015-12-05T00:23:15Z

Currently, rcu_torture_writer_state is printed as an integer, which slows
debugging. This commit therefore prints a symbolic name in addition to
the integer.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---
kernel/rcu/rcutorture.c | 24 +++++++++++++++++++++++-
1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index d89328e260df..adbb194e2b5d 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -162,6 +162,27 @@ static int rcu_torture_writer_state;
#define RTWS_SYNC 7
#define RTWS_STUTTER 8
#define RTWS_STOPPING 9
+static char * const rcu_torture_writer_state_names[] = {
+ "RTWS_FIXED_DELAY",
+ "RTWS_DELAY",
+ "RTWS_REPLACE",
+ "RTWS_DEF_FREE",
+ "RTWS_EXP_SYNC",
+ "RTWS_COND_GET",
+ "RTWS_COND_SYNC",
+ "RTWS_SYNC",
+ "RTWS_STUTTER",
+ "RTWS_STOPPING",
+};
+
+char *rcu_torture_writer_state_getname(void)
+{
+ unsigned int i = READ_ONCE(rcu_torture_writer_state);
+
+ if (i >= ARRAY_SIZE(rcu_torture_writer_state_names))
+ return "???";
+ return rcu_torture_writer_state_names[i];
+}

#if defined(MODULE) || defined(CONFIG_RCU_TORTURE_TEST_RUNNABLE)
#define RCUTORTURE_RUNNABLE_INIT 1
@@ -1307,7 +1328,8 @@ rcu_torture_stats_print(void)

rcutorture_get_gp_data(cur_ops->ttype,
&flags, &gpnum, &completed);
- pr_alert("??? Writer stall state %d g%lu c%lu f%#x\n",
+ pr_alert("??? Writer stall state %s(%d) g%lu c%lu f%#x\n",
+ rcu_torture_writer_state_getname(),
rcu_torture_writer_state,
gpnum, completed, flags);
show_rcu_gp_kthreads();
--
2.5.2