[PATCH 1/4] rt-tests: Fix warnings

[Crystal Wood <crwood@redhat.com>]

Numerous places threw sign comparison warnings; we could fix them but
it's kind of an obnoxious warning that requires casts to deal with things
such as ARRAY_SIZE() while still being able to check for the user
entering a negative number.

-Wunused-parameter is another obnoxious warning as it flags perfectly
reasonable code that takes unneeded parameters in order to comply with
a function pointer interface or similar; however, all of the instances
that were flagged here were actual dead parameters, so just fix them.

Add volatile to timer_started in hackbench so that it doesn't get
clobbered by longjmp().

Signed-off-by: Crystal Wood <crwood@redhat.com>
--
Let me know if you'd rather I fix the sign warnings.
---
 Makefile                            |  2 +-
 src/hackbench/hackbench.c           |  2 +-
 src/sched_deadline/cyclicdeadline.c |  6 +++---
 src/sched_deadline/deadline_test.c  | 10 +++++-----
 src/sigwaittest/sigwaittest.c       |  6 +++---
 5 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/Makefile b/Makefile
index 2808c212058a..ad481a73cf93 100644
--- a/Makefile
+++ b/Makefile
@@ -31,7 +31,7 @@ prefix  ?= /usr/local
 bindir  ?= $(prefix)/bin
 mandir	?= $(prefix)/share/man
 
-CFLAGS ?= -Wall -Wno-nonnull -Wextra
+CFLAGS ?= -Wall -Wno-nonnull -Wextra -Wno-sign-compare
 CPPFLAGS += -D_GNU_SOURCE -Isrc/include
 LDFLAGS ?=
 
diff --git a/src/hackbench/hackbench.c b/src/hackbench/hackbench.c
index 69dd5f087fb6..4430db0e4ed6 100644
--- a/src/hackbench/hackbench.c
+++ b/src/hackbench/hackbench.c
@@ -494,7 +494,7 @@ int main(int argc, char *argv[])
 	struct timeval start, stop, diff;
 	int readyfds[2], wakefds[2];
 	char dummy;
-	int timer_started = 0;
+	volatile int timer_started = 0;
 	struct sched_param sp;
 
 	process_options (argc, argv);
diff --git a/src/sched_deadline/cyclicdeadline.c b/src/sched_deadline/cyclicdeadline.c
index 9bdc4b5deaf1..097e2e5d4580 100644
--- a/src/sched_deadline/cyclicdeadline.c
+++ b/src/sched_deadline/cyclicdeadline.c
@@ -750,7 +750,7 @@ static void print_stat(FILE *fp, struct sched_data *sd, int index, int verbose,
 	}
 }
 
-static u64 do_runtime(long tid, struct sched_data *sd, u64 period)
+static u64 do_runtime(struct sched_data *sd, u64 period)
 {
 	struct thread_stat *stat = &sd->stat;
 	u64 next_period = period + sd->deadline_us;
@@ -833,7 +833,7 @@ void *run_deadline(void *data)
 	period = get_time_us();
 
 	while (!shutdown) {
-		period = do_runtime(tid, sd, period);
+		period = do_runtime(sd, period);
 		if (tracelimit && (stat->max > tracelimit)) {
 			shutdown++;
 			pthread_mutex_lock(&break_thread_id_lock);
@@ -1266,7 +1266,7 @@ int main(int argc, char **argv)
 
 		/* Make sure that we can make our deadlines */
 		start_period = get_time_us();
-		do_runtime(gettid(), sd, start_period);
+		do_runtime(sd, start_period);
 		end_period = get_time_us();
 		if (end_period - start_period > sd->runtime_us)
 			fatal("Failed to perform task within runtime: Missed by %lld us\n",
diff --git a/src/sched_deadline/deadline_test.c b/src/sched_deadline/deadline_test.c
index cd8ef01f7d68..ca2da476ec95 100644
--- a/src/sched_deadline/deadline_test.c
+++ b/src/sched_deadline/deadline_test.c
@@ -1181,7 +1181,7 @@ static int read_ctx_switches(int *vol, int *nonvol, int *migrate)
  *  @data->total_time - Total time it took to complete all loops
  *  @data->nr_periods - Number of periods that were executed.
  */
-static u64 do_runtime(long tid, struct sched_data *data, u64 period)
+static u64 do_runtime(struct sched_data *data, u64 period)
 {
 	u64 next_period = period + data->deadline_us;
 	u64 now = get_time_us();
@@ -1354,7 +1354,7 @@ void *run_deadline(void *data)
 	period = get_time_us();
 
 	while (!done) {
-		period = do_runtime(tid, sched_data, period);
+		period = do_runtime(sched_data, period);
 		sched_yield();
 	}
 	ret = sched_getattr(0, &attr, sizeof(attr), 0);
@@ -1714,7 +1714,7 @@ static u64 calculate_loops_per_ms(u64 *overhead)
 	do_sleep(1000);
 
 	start = get_time_us();
-	do_runtime(0, &sd, start + sd.deadline_us);
+	do_runtime(&sd, start + sd.deadline_us);
 	end = get_time_us();
 
 	diff = end - start;
@@ -1743,7 +1743,7 @@ static u64 calculate_loops_per_ms(u64 *overhead)
 	do_sleep(1000);
 
 	start = get_time_us();
-	do_runtime(0, &sd, start + sd.deadline_us);
+	do_runtime(&sd, start + sd.deadline_us);
 	end = get_time_us();
 
 	odiff = end - start;
@@ -1962,7 +1962,7 @@ int main(int argc, char **argv)
 
 		/* Make sure that we can make our deadlines */
 		start_period = get_time_us();
-		do_runtime(gettid(), sd, start_period);
+		do_runtime(sd, start_period);
 		end_period = get_time_us();
 		if (end_period - start_period > sd->runtime_us) {
 			printf("Failed to perform task within runtime: Missed by %lld us\n",
diff --git a/src/sigwaittest/sigwaittest.c b/src/sigwaittest/sigwaittest.c
index 55855769c63b..8c1c16fb3081 100644
--- a/src/sigwaittest/sigwaittest.c
+++ b/src/sigwaittest/sigwaittest.c
@@ -375,7 +375,7 @@ static void sighand(int sig __attribute__ ((unused)))
 	mustshutdown = 1;
 }
 
-static void print_stat(FILE *fp, struct params *receiver, struct params *sender,
+static void print_stat(struct params *receiver, struct params *sender,
 		       int verbose __attribute__ ((unused)), int quiet)
 {
 	int i;
@@ -644,7 +644,7 @@ int main(int argc, char *argv[])
 			    sender[i].shutdown;
 
 		if (receiver[0].samples > oldsamples || mustshutdown) {
-			print_stat(stdout, receiver, sender, 0, quiet);
+			print_stat(receiver, sender, 0, quiet);
 			if (!quiet)
 				printf("\033[%dA", num_threads*2);
 		}
@@ -664,7 +664,7 @@ int main(int argc, char *argv[])
 	if (!quiet)
 		printf("\033[%dB", num_threads*2 + 2);
 	else
-		print_stat(stdout, receiver, sender, 0, 0);
+		print_stat(receiver, sender, 0, 0);
 
 	for (i = 0; i < num_threads; i++) {
 		receiver[i].shutdown = 1;
-- 
2.43.0