Were jprobes removed from kernel v4?

jprobes are deprecated in the Linux kernel and the sample file was removed in commit 9be95bd:

commit 9be95bdc53c12ada23e39027237fd05e1393d893
Author: Masami Hiramatsu <[email protected]>
Date:   Fri Oct 6 08:15:57 2017 +0900

    kprobes: Remove the jprobes sample code

    Remove the jprobes sample module because jprobes are deprecated.

    [...]

That commit was merged in 4.15-rc1.

-38 is -ENOSYS, the error code for invalid system call numbers.

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