s390: fold kernel_thread_helper() into ret_from_fork()
... and don't bother with syscall return path in case of kernel
threads.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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... and don't bother with syscall return path in case of kernel
threads.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>