[PATCH 1/3] rcuperf: Remove unnecessary rcu_perf_writer_state variable

From: SeongJae Park
Date: Sun Aug 21 2016 - 03:54:54 EST


rcu_perf_writer_state is being written only while nobody reads it. This
commit removes the unnecessary variable and macro constants for it.

Signed-off-by: SeongJae Park <sj38.park@xxxxxxxxx>
---
kernel/rcu/rcuperf.c | 16 ++--------------
1 file changed, 2 insertions(+), 14 deletions(-)

diff --git a/kernel/rcu/rcuperf.c b/kernel/rcu/rcuperf.c
index d38ab08..6025342 100644
--- a/kernel/rcu/rcuperf.c
+++ b/kernel/rcu/rcuperf.c
@@ -86,13 +86,6 @@ static u64 t_rcu_perf_writer_finished;
static unsigned long b_rcu_perf_writer_started;
static unsigned long b_rcu_perf_writer_finished;

-static int rcu_perf_writer_state;
-#define RTWS_INIT 0
-#define RTWS_EXP_SYNC 1
-#define RTWS_SYNC 2
-#define RTWS_IDLE 2
-#define RTWS_STOPPING 3
-
#define MAX_MEAS 10000
#define MIN_MEAS 100

@@ -381,14 +374,10 @@ rcu_perf_writer(void *arg)
do {
wdp = &wdpp[i];
*wdp = ktime_get_mono_fast_ns();
- if (gp_exp) {
- rcu_perf_writer_state = RTWS_EXP_SYNC;
+ if (gp_exp)
cur_ops->exp_sync();
- } else {
- rcu_perf_writer_state = RTWS_SYNC;
+ else
cur_ops->sync();
- }
- rcu_perf_writer_state = RTWS_IDLE;
t = ktime_get_mono_fast_ns();
*wdp = t - *wdp;
i_max = i;
@@ -429,7 +418,6 @@ rcu_perf_writer(void *arg)
i++;
rcu_perf_wait_shutdown();
} while (!torture_must_stop());
- rcu_perf_writer_state = RTWS_STOPPING;
writer_n_durations[me] = i_max;
torture_kthread_stopping("rcu_perf_writer");
return 0;
--
1.9.1