selftests/bpf: Output the correct error code for pthread APIs

The return value of pthread API is the error code when the called
API fails, so output the return value instead of errno.

Signed-off-by: Hou Tao <houtao1@huawei.com>
Link: https://lore.kernel.org/r/20230613080921.1623219-3-houtao@huaweicloud.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/tools/testing/selftests/bpf/bench.c b/tools/testing/selftests/bpf/bench.c
index d9c080a..0b5d2b5 100644 (file)
--- a/tools/testing/selftests/bpf/bench.c
+++ b/tools/testing/selftests/bpf/bench.c
@@ -441,12 +441,14 @@ static void setup_timer()
 static void set_thread_affinity(pthread_t thread, int cpu)
 {
        cpu_set_t cpuset;
+       int err;
 
        CPU_ZERO(&cpuset);
        CPU_SET(cpu, &cpuset);
-       if (pthread_setaffinity_np(thread, sizeof(cpuset), &cpuset)) {
+       err = pthread_setaffinity_np(thread, sizeof(cpuset), &cpuset);
+       if (err) {
                fprintf(stderr, "setting affinity to CPU #%d failed: %d\n",
-                       cpu, errno);
+                       cpu, -err);
                exit(1);
        }
 }
@@ -605,7 +607,7 @@ static void setup_benchmark(void)
                                     bench->consumer_thread, (void *)(long)i);
                if (err) {
                        fprintf(stderr, "failed to create consumer thread #%d: %d\n",
-                               i, -errno);
+                               i, -err);
                        exit(1);
                }
                if (env.affinity)
@@ -624,7 +626,7 @@ static void setup_benchmark(void)
                                     bench->producer_thread, (void *)(long)i);
                if (err) {
                        fprintf(stderr, "failed to create producer thread #%d: %d\n",
-                               i, -errno);
+                               i, -err);
                        exit(1);
                }
                if (env.affinity)