On 12/3/25 9:25 AM, Shuah wrote:

On 12/2/25 22:20, Guenter Roeck wrote:

...

Hi,

when trying to build tools/testing/selftests, I get a lot of warnings such as

mount-notify_test.c: In function ‘fanotify_fsmount’: mount-notify_test.c:360:14: warning: implicit declaration of function ‘fsopen’; did you mean ‘fdopen’?

and subsequent build errors.

testing/selftests/filesystems/mount-notify/mount-notify_test.c:360: undefined reference to `fsopen' /usr/bin/ld: tools/testing/selftests/filesystems/mount-notify/mount-notify_test.c:363: undefined reference to `fsconfig' /usr/bin/ld:tools/testing/selftests/filesystems/mount-notify/mount-notify_test.c:366: undefined reference to `fsmount' /usr/bin/ld: tools/testing/selftests/filesystems/mount-notify/mount-notify_test.c:371: undefined reference to `move_mount'

This does not just affect a single file, but several of them.

What am I missing ? Is there some magic needed to build the selftests ?

Not sure. It built fine for me on Linux 6.18 latest. Are you missing a library possibly?

Guenter, did you follow Documentation/dev-tools/kselftest.rst?

Shuah, is that document what you recommend?