Fix compilation error in pid_max.c by including <sys/mount.h> to define
mount(), umount2(), MS_PRIVATE, MS_REC, and MNT_DETACH.

The test now builds successfully.

Signed-off-by: Moon Hee Lee <moonhee.lee...@gmail.com>
---
 tools/testing/selftests/pid_namespace/pid_max.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/pid_namespace/pid_max.c 
b/tools/testing/selftests/pid_namespace/pid_max.c
index 51c414faabb0..972bedc475f1 100644
--- a/tools/testing/selftests/pid_namespace/pid_max.c
+++ b/tools/testing/selftests/pid_namespace/pid_max.c
@@ -11,6 +11,7 @@
 #include <string.h>
 #include <syscall.h>
 #include <sys/wait.h>
+#include <sys/mount.h>
 
 #include "../kselftest_harness.h"
 #include "../pidfd/pidfd.h"
-- 
2.43.0


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