[LTP] [PATCH] API: Give user hint when checkpoints were not initialised

[Richard Palethorpe]

Currently the user gets an error about EOVERFLOW. This will hopefully
save some searching.

Signed-off-by: Richard Palethorpe <rpalethorpe@suse.com>
---
 lib/tst_checkpoint.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/tst_checkpoint.c b/lib/tst_checkpoint.c
index 9e9dcf9e6..13d86c73b 100644
--- a/lib/tst_checkpoint.c
+++ b/lib/tst_checkpoint.c
@@ -86,6 +86,9 @@ int tst_checkpoint_wait(unsigned int id, unsigned int msec_timeout)
 	struct timespec timeout;
 	int ret;
 
+	if (!tst_max_futexes)
+		tst_brkm(TBROK, NULL, "Set test.needs_checkpoints = 1");
+
 	if (id >= tst_max_futexes) {
 		errno = EOVERFLOW;
 		return -1;
@@ -107,7 +110,10 @@ int tst_checkpoint_wake(unsigned int id, unsigned int nr_wake,
 {
 	unsigned int msecs = 0, waked = 0;
 
-	if (id >= tst_max_futexes) {
+	if (!tst_max_futexes)
+		tst_brkm(TBROK, NULL, "Set test.needs_checkpoints = 1");
+
+        if (id >= tst_max_futexes) {
 		errno = EOVERFLOW;
 		return -1;
 	}
-- 
2.31.1