MADV_COLLAPSE is part of linux/mman.h and needs to be included
for this selftest for glibc compatibility. It is also included
in other tests that use MADV_COLLAPSE.

Fixes: d9c7ff4dae62 ("selftests: prctl: introduce tests for disabling THPs completely")
Reported-by: Mark Brown <broonie@kernel.org>
Closes: https://lore.kernel.org/all/c8249725-e91d-4c51-b9bb-40305e61e20d@sirena.org.uk/
Signed-off-by: Usama Arif <usamaarif642@gmail.com>
---
 tools/testing/selftests/mm/prctl_thp_disable.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/mm/prctl_thp_disable.c b/tools/testing/selftests/mm/prctl_thp_disable.c
index feb711dca3a1d..84b4a4b345af5 100644
--- a/tools/testing/selftests/mm/prctl_thp_disable.c
+++ b/tools/testing/selftests/mm/prctl_thp_disable.c
@@ -9,6 +9,7 @@
 #include <string.h>
 #include <unistd.h>
 #include <sys/mman.h>
+#include <linux/mman.h>
 #include <sys/prctl.h>
 #include <sys/wait.h>
 
-- 
2.47.3