commit 23311b81820767f156500744ff5fa84f56bc7fd1
author Emilio G. Cota <cota@braap.org> Sun Aug 19 05:13:29 2018 -0400
committer Paolo Bonzini <pbonzini@redhat.com> Thu Aug 23 18:46:25 2018 +0200
tree 7fd2227b9c5dd8db91c0e253fb14dec27d8c7e12
parent 945d9c7530dd22a7a500dd8833836d6054a17ab9

test-rcu-list: access goflag with atomics

Instead of declaring it volatile.

Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-Id: <20180819091335.22863-6-cota@braap.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

tests/test-rcu-list.c

diff --git a/tests/test-rcu-list.c b/tests/test-rcu-list.c
index 1514d7e..b4ed130 100644
--- a/tests/test-rcu-list.c
+++ b/tests/test-rcu-list.c
@@ -44,7 +44,7 @@
 #define GOFLAG_RUN  1
 #define GOFLAG_STOP 2
 
-static volatile int goflag = GOFLAG_INIT;
+static int goflag = GOFLAG_INIT;
 
 #define RCU_READ_RUN 1000
 #define RCU_UPDATE_RUN 10
@@ -107,15 +107,15 @@
 
     *(struct rcu_reader_data **)arg = &rcu_reader;
     atomic_inc(&nthreadsrunning);
-    while (goflag == GOFLAG_INIT) {
+    while (atomic_read(&goflag) == GOFLAG_INIT) {
         g_usleep(1000);
     }
 
-    while (goflag == GOFLAG_RUN) {
+    while (atomic_read(&goflag) == GOFLAG_RUN) {
         rcu_read_lock();
         QLIST_FOREACH_RCU(el, &Q_list_head, entry) {
             n_reads_local++;
-            if (goflag == GOFLAG_STOP) {
+            if (atomic_read(&goflag) == GOFLAG_STOP) {
                 break;
             }
         }
@@ -142,11 +142,11 @@
 
     *(struct rcu_reader_data **)arg = &rcu_reader;
     atomic_inc(&nthreadsrunning);
-    while (goflag == GOFLAG_INIT) {
+    while (atomic_read(&goflag) == GOFLAG_INIT) {
         g_usleep(1000);
     }
 
-    while (goflag == GOFLAG_RUN) {
+    while (atomic_read(&goflag) == GOFLAG_RUN) {
         target_el = select_random_el(RCU_Q_LEN);
         j = 0;
         /* FOREACH_RCU could work here but let's use both macros */
@@ -160,7 +160,7 @@
                 break;
             }
         }
-        if (goflag == GOFLAG_STOP) {
+        if (atomic_read(&goflag) == GOFLAG_STOP) {
             break;
         }
         target_el = select_random_el(RCU_Q_LEN);
@@ -209,9 +209,9 @@
         g_usleep(1000);
     }
 
-    goflag = GOFLAG_RUN;
+    atomic_set(&goflag, GOFLAG_RUN);
     sleep(duration);
-    goflag = GOFLAG_STOP;
+    atomic_set(&goflag, GOFLAG_STOP);
     wait_all_threads();
 }