selftests: xsk: Remove thread attribute

There is really no reason to have a non-default thread stack
size. Remove that.
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210329224316.17793-16-maciej.fijalkowski@intel.com

tools/testing/selftests/bpf/xdpxceiver.c

@@ -764,8 +764,6 @@ static void thread_common_ops(struct ifobject *ifobject, void *bufs)
 	int ctr = 0;
 	int ret;
 
-	pthread_attr_setstacksize(&attr, THREAD_STACK);
-
 	ifobject->ns_fd = switch_namespace(ifobject->nsname);
 
 	if (test_type == TEST_TYPE_BPF_RES)
@@ -909,13 +907,10 @@ static void testapp_validate(void)
 	bool bidi = test_type == TEST_TYPE_BIDI;
 	bool bpf = test_type == TEST_TYPE_BPF_RES;
 
-	pthread_attr_init(&attr);
-	pthread_attr_setstacksize(&attr, THREAD_STACK);
-
 	pthread_mutex_lock(&sync_mutex);
 
 	/*Spawn RX thread */
-	pthread_create(&t0, &attr, ifdict_rx->func_ptr, ifdict_rx);
+	pthread_create(&t0, NULL, ifdict_rx->func_ptr, ifdict_rx);
 
 	if (clock_gettime(CLOCK_REALTIME, &max_wait))
 		exit_with_error(errno);
@@ -927,7 +922,7 @@ static void testapp_validate(void)
 	pthread_mutex_unlock(&sync_mutex);
 
 	/*Spawn TX thread */
-	pthread_create(&t1, &attr, ifdict_tx->func_ptr, ifdict_tx);
+	pthread_create(&t1, NULL, ifdict_tx->func_ptr, ifdict_tx);
 
 	pthread_join(t1, NULL);
 	pthread_join(t0, NULL);

tools/testing/selftests/bpf/xdpxceiver.h

@@ -37,7 +37,6 @@
 #define TMOUT_SEC (3)
 #define EOT (-1)
 #define USLEEP_MAX 200000
-#define THREAD_STACK 60000000
 #define SOCK_RECONF_CTR 10
 #define BATCH_SIZE 64
 #define POLL_TMOUT 1000
@@ -152,7 +151,6 @@ static struct ifobject *ifdict_tx;
 pthread_mutex_t sync_mutex;
 pthread_cond_t signal_rx_condition;
 pthread_t t0, t1;
-pthread_attr_t attr;
 
 TAILQ_HEAD(head_s, pkt) head = TAILQ_HEAD_INITIALIZER(head);
 struct head_s *head_p;