selftests: Add futex functional tests

The futextest testsuite [1] provides functional, stress, and
performance tests for the various futex op codes. Those tests will be of
more use to futex developers if they are included with the kernel
source.

Copy the core infrastructure and the functional tests into selftests,
but adapt them for inclusion in the kernel:

- Update the Makefile to include the run_tests target, remove reference
  to the performance and stress tests from the contributed sources.
- Replace my dead IBM email address with my current Intel email address.
- Remove the warrantee and write-to paragraphs from the license blurbs.
- Remove the NAME section as the filename is easily determined. ;-)
- Make the whitespace usage consistent in a couple of places.
- Cleanup various CodingStyle violations.

A future effort will explore moving the performance and stress tests
into the kernel.

1. http://git.kernel.org/cgit/linux/kernel/git/dvhart/futextest.git

Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: linux-api@vger.kernel.org
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

1 files changed, 124 insertions, 0 deletions

diff --git a/tools/testing/selftests/futex/functional/futex_wait_uninitialized_heap.c b/tools/testing/selftests/futex/functional/futex_wait_uninitialized_heap.c
new file mode 100644
index 000000000000..fe7aee96844b
--- /dev/null
+++ b/tools/testing/selftests/futex/functional/futex_wait_uninitialized_heap.c
@@ -0,0 +1,124 @@
+/******************************************************************************
+ *
+ * Copyright FUJITSU LIMITED 2010
+ * Copyright KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
+ *
+ *   This program is free software;  you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ * DESCRIPTION
+ *      Wait on uninitialized heap. It shold be zero and FUTEX_WAIT should
+ *      return immediately. This test is intent to test zero page handling in
+ *      futex.
+ *
+ * AUTHOR
+ *      KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
+ *
+ * HISTORY
+ *      2010-Jan-6: Initial version by KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
+ *
+ *****************************************************************************/
+
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <syscall.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <errno.h>
+#include <linux/futex.h>
+#include <libgen.h>
+
+#include "logging.h"
+#include "futextest.h"
+
+#define WAIT_US 5000000
+
+static int child_blocked = 1;
+static int child_ret;
+void *buf;
+
+void usage(char *prog)
+{
+	printf("Usage: %s\n", prog);
+	printf("  -c	Use color\n");
+	printf("  -h	Display this help message\n");
+	printf("  -v L	Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n",
+	       VQUIET, VCRITICAL, VINFO);
+}
+
+void *wait_thread(void *arg)
+{
+	int res;
+
+	child_ret = RET_PASS;
+	res = futex_wait(buf, 1, NULL, 0);
+	child_blocked = 0;
+
+	if (res != 0 && errno != EWOULDBLOCK) {
+		error("futex failure\n", errno);
+		child_ret = RET_ERROR;
+	}
+	pthread_exit(NULL);
+}
+
+int main(int argc, char **argv)
+{
+	int c, ret = RET_PASS;
+	long page_size;
+	pthread_t thr;
+
+	while ((c = getopt(argc, argv, "chv:")) != -1) {
+		switch (c) {
+		case 'c':
+			log_color(1);
+			break;
+		case 'h':
+			usage(basename(argv[0]));
+			exit(0);
+		case 'v':
+			log_verbosity(atoi(optarg));
+			break;
+		default:
+			usage(basename(argv[0]));
+			exit(1);
+		}
+	}
+
+	page_size = sysconf(_SC_PAGESIZE);
+
+	buf = mmap(NULL, page_size, PROT_READ|PROT_WRITE,
+		   MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
+	if (buf == (void *)-1) {
+		error("mmap\n", errno);
+		exit(1);
+	}
+
+	printf("%s: Test the uninitialized futex value in FUTEX_WAIT\n",
+	       basename(argv[0]));
+
+
+	ret = pthread_create(&thr, NULL, wait_thread, NULL);
+	if (ret) {
+		error("pthread_create\n", errno);
+		ret = RET_ERROR;
+		goto out;
+	}
+
+	info("waiting %dus for child to return\n", WAIT_US);
+	usleep(WAIT_US);
+
+	ret = child_ret;
+	if (child_blocked) {
+		fail("child blocked in kernel\n");
+		ret = RET_FAIL;
+	}
+
+ out:
+	print_result(ret);
+	return ret;
+}