32bits-limit waits for the thread to indicate it has started by busy
spinning on a common variable. The compiler is clever and knows that the
variable cannot change within the thread, and turns it into an infinite
loop!
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Lionel Landwerlin <lionel.g.landwerlin@xxxxxxxxx>
---
tests/syncobj_timeline.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/tests/syncobj_timeline.c b/tests/syncobj_timeline.c
index be7dd2d1c..20375cdd3 100644
--- a/tests/syncobj_timeline.c
+++ b/tests/syncobj_timeline.c
@@ -1245,9 +1245,11 @@ test_32bits_limit(int fd)
uint64_t value, last_value;
int i;
- igt_assert_eq(pthread_create(&thread, NULL, checker_thread_func, &thread_data), 0);
+ igt_assert_eq(pthread_create(&thread, NULL,
+ checker_thread_func, &thread_data), 0);
- while (!thread_data.started);
+ while (!READ_ONCE(thread_data.started))
+ ;
for (i = 0; i < ARRAY_SIZE(points); i++) {
int fence = sw_sync_timeline_create_fence(timeline, i + 1);
--
2.28.0
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