perf bench futex: Simplify wrapper for LOCK_PI

Given that the 'val' parameter is ignored for FUTEX_LOCK_PI, get rid of
the bogus deadlock detection flag in the wrapper code and avoid the
extra argument, making it resemble its unlock counterpart. And if
nothing else, we already only pass 0 anyway.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Davidlohr Bueso <dbueso@suse.de>
Link: http://lkml.kernel.org/r/1461208447-29328-1-git-send-email-dave@stgolabs.net
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/bench/futex-lock-pi.c

@@ -83,7 +83,7 @@ static void *workerfn(void *arg)
 	do {
 		int ret;
 	again:
-		ret = futex_lock_pi(w->futex, NULL, 0, futex_flag);
+		ret = futex_lock_pi(w->futex, NULL, futex_flag);
 
 		if (ret) { /* handle lock acquisition */
 			if (!silent)

tools/perf/bench/futex.h

@@ -57,13 +57,11 @@ futex_wake(u_int32_t *uaddr, int nr_wake, int opflags)
 
 /**
  * futex_lock_pi() - block on uaddr as a PI mutex
- * @detect:	whether (1) or not (0) to perform deadlock detection
  */
 static inline int
-futex_lock_pi(u_int32_t *uaddr, struct timespec *timeout, int detect,
-	      int opflags)
+futex_lock_pi(u_int32_t *uaddr, struct timespec *timeout, int opflags)
 {
-	return futex(uaddr, FUTEX_LOCK_PI, detect, timeout, NULL, 0, opflags);
+	return futex(uaddr, FUTEX_LOCK_PI, 0, timeout, NULL, 0, opflags);
 }
 
 /**