[LTP] [PATCH] ipc/msgstress03: Assume all forks will run concurently

[Teo Couprie Diaz]

It appears that msgstress03 doesn't account for all PIDs that its children
can use, as it expects the tasks will terminate quickly and not reach
the PID limit.
On some systems, this assumption can be invalid and the PID limit
will be hit.
Change the limit to account for all possible children at once, knowning
that each child will fork as well.

Signed-off-by: Teo Couprie Diaz <teo.coupriediaz@arm.com>
Reviewed-by: Richard Palethorpe <rpalethorpe@suse.com>
---
This patch was already reviewed as part of a larger series[0]. The rest of
the series needs a large rework to be merged, but I felt this patch was a
simple and independnt enough to warrant a resend.
No changes were made.

CI Build: https://github.com/Teo-CD/ltp/actions/runs/4502197808

[0]: https://lists.linux.it/pipermail/ltp/2023-February/033007.html

 testcases/kernel/syscalls/ipc/msgstress/msgstress03.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/testcases/kernel/syscalls/ipc/msgstress/msgstress03.c b/testcases/kernel/syscalls/ipc/msgstress/msgstress03.c
index 3cb70ab18..0c46927b8 100644
--- a/testcases/kernel/syscalls/ipc/msgstress/msgstress03.c
+++ b/testcases/kernel/syscalls/ipc/msgstress/msgstress03.c
@@ -109,7 +109,7 @@ int main(int argc, char **argv)
 		}
 	}
 
-	free_pids = tst_get_free_pids(cleanup);
+	free_pids = tst_get_free_pids(cleanup) / 2;
 	if (nprocs >= free_pids) {
 		tst_resm(TINFO,
 			 "Requested number of processes higher than limit (%d > %d), "
-- 
2.25.1