selftests/bpf: skip the timer_lockup test for single-CPU nodes

The timer_lockup test needs 2 CPUs to work, on single-CPU nodes it fails
to set thread affinity to CPU 1 since it doesn't exist:

    # ./test_progs -t test_lockup
    test_timer_lockup:PASS:timer_lockup__open_and_load 0 nsec
    test_timer_lockup:PASS:pthread_create thread1 0 nsec
    test_timer_lockup:PASS:pthread_create thread2 0 nsec
    timer_lockup_thread:PASS:cpu affinity 0 nsec
    timer_lockup_thread:FAIL:cpu affinity unexpected error: 22 (errno 0)
    test_timer_lockup:PASS: 0 nsec
    #406     timer_lockup:FAIL

Skip the test if only 1 CPU is available.

Signed-off-by: Viktor Malik <[email protected]>
Fixes: 50bd5a0 ("selftests/bpf: Add timer lockup selftest")
Tested-by: Philo Lu <[email protected]>
Acked-by: Kumar Kartikeya Dwivedi <[email protected]>

Author: viktormalik

tools/testing/selftests/bpf/prog_tests/timer_lockup.c

@@ -5,6 +5,7 @@
 #include <test_progs.h>
 #include <pthread.h>
 #include <network_helpers.h>
+#include <sys/sysinfo.h>
 
 #include "timer_lockup.skel.h"
 
@@ -52,6 +53,11 @@ void test_timer_lockup(void)
 	pthread_t thrds[2];
 	void *ret;
 
+	if (get_nprocs() < 2) {
+		test__skip();
+		return;
+	}
+
 	skel = timer_lockup__open_and_load();
 	if (!ASSERT_OK_PTR(skel, "timer_lockup__open_and_load"))
 		return;