[dpdk-dev] [PATCH v2] test/atomic: fix false failures for 128-bit atomic compare exchange test

[David Christensen <drc@linux.vnet.ibm.com>]

When checking the results of the rte_atomic128_cmp_exchange() function,
current code compares the values of a uint32_t and a uint64_t variable.
If the number of lcores used by the test is large, or the value of the
iteration count N is increased, the variable size mismatch can cause a
false test failure.  Modify the comparison to compare uint64_t values.

Fixes: fa3253c534b1 ("test/atomic: add 128-bit atomic compare exchange test")
Cc: phil.yang@arm.com

Signed-off-by: David Christensen <drc@linux.vnet.ibm.com>
Tested-by: Ruifeng Wang <ruifeng.wang@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
---
v2:
- Fixed commit message spelling error
---
 app/test/test_atomic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/test/test_atomic.c b/app/test/test_atomic.c
index f10f555af8..ce0c259bd7 100644
--- a/app/test/test_atomic.c
+++ b/app/test/test_atomic.c
@@ -591,7 +591,7 @@ test_atomic(void)
 	rte_atomic32_clear(&synchro);

 	iterations = count128.val[0] - count128.val[1];
-	if (iterations != 4*N*(rte_lcore_count()-1)) {
+	if (iterations != (uint64_t)4*N*(rte_lcore_count()-1)) {
 		printf("128-bit compare and swap failed\n");
 		return -1;
 	}
--
2.27.0