Fix compilation errors in pid_max.c by including <sys/mount.h>, which
provides definitions for mount(), umount2(), MS_PRIVATE, MS_REC, and
MNT_DETACH.
Without this header, the build fails with implicit declarations and
undefined constants during selftest compilation.
Changes since v1:
- Included example build errors below for clarity
Compile error:
pid_max.c: In function ‘pid_max_cb’:
pid_max.c:42:15: warning: implicit declaration of function ‘mount’
[-Wimplicit-function-declaration]
42 | ret = mount("", "/", NULL, MS_PRIVATE | MS_REC, 0);
| ^~~~~
pid_max.c:42:36: error: ‘MS_PRIVATE’ undeclared; did you mean ‘MAP_PRIVATE’?
pid_max.c:42:49: error: ‘MS_REC’ undeclared
pid_max.c:48:9: warning: implicit declaration of function ‘umount2’
pid_max.c:48:26: error: ‘MNT_DETACH’ undeclared
[...output trimmed for brevity...]
make: *** [../lib.mk:222:
/linux_mainline/tools/testing/selftests/pid_namespace/pid_max] Error 1
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
