perf bench futex: Use NSEC_PER_USEC

Following kernel practices and better documentin

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-xncwqxegjp13g2nxih3lp9mx@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/bench/futex-wake.c

@@ -16,6 +16,7 @@
 #include <subcmd/parse-options.h>
 #include <linux/compiler.h>
 #include <linux/kernel.h>
+#include <linux/time64.h>
 #include <errno.h>
 #include "bench.h"
 #include "futex.h"
@@ -81,7 +82,7 @@ static void print_summary(void)
 	printf("Wokeup %d of %d threads in %.4f ms (+-%.2f%%)\n",
 	       wakeup_avg,
 	       nthreads,
-	       waketime_avg/1e3,
+	       waketime_avg / USEC_PER_MSEC,
 	       rel_stddev_stats(waketime_stddev, waketime_avg));
 }
 
@@ -182,7 +183,7 @@ int bench_futex_wake(int argc, const char **argv,
 
 		if (!silent) {
 			printf("[Run %d]: Wokeup %d of %d threads in %.4f ms\n",
-			       j + 1, nwoken, nthreads, runtime.tv_usec/1e3);
+			       j + 1, nwoken, nthreads, runtime.tv_usec / (double)USEC_PER_MSEC);
 		}
 
 		for (i = 0; i < nthreads; i++) {