selftests/timers: Quiet warning due to lack of return check on brk

The posix_timers.c test has a loop that tries to keep it in
kernel space, repeatedly calling brk(). However, it doesn't
check the return value, which causes warnings.

This patch adds a err value which captures the return value
and modifies the test so it will quit if a failure occurs.

Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Tested-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

diff --git a/tools/testing/selftests/timers/posix_timers.c b/tools/testing/selftests/timers/posix_timers.c
index f87d970..5a246a0 100644 (file)
--- a/tools/testing/selftests/timers/posix_timers.c
+++ b/tools/testing/selftests/timers/posix_timers.c
@@ -35,10 +35,11 @@ static void user_loop(void)
 static void kernel_loop(void)
 {
        void *addr = sbrk(0);
+       int err = 0;
 
-       while (!done) {
-               brk(addr + 4096);
-               brk(addr);
+       while (!done && !err) {
+               err = brk(addr + 4096);
+               err |= brk(addr);
        }
 }
 
@@ -190,8 +191,6 @@ static int check_timer_create(int which)
 
 int main(int argc, char **argv)
 {
-       int err;
-
        printf("Testing posix timers. False negative may happen on CPU execution \n");
        printf("based timers if other threads run on the CPU...\n");