On Wed, Dec 08, 2021 at 02:25:23PM -0600, Eric W. Biederman wrote:

My s390 assembly is not particularly good so I have read the history
of the reference to do_exit copy_thread and have been able to
verify that do_exit is not used.

The general argument is that s390 has been changed to use the generic
kernel_thread and kernel_execve and the generic versions do not call
do_exit.  So it is strange to see a do_exit reference sitting there.

The history of the do_exit reference in s390's version of copy_thread
seems conclusive that the do_exit reference is something that lingers
and should have been removed several years ago.

...

Remove this dead reference to do_exit to make it clear that s390 is
not doing anything with do_exit in copy_thread.

Signed-off-by: "Eric W. Biederman" <redacted>
---
 arch/s390/kernel/process.c | 1 -
 1 file changed, 1 deletion(-)

Applied to s390 tree. Just in case you want to apply this to your tree too:
Acked-by: Heiko Carstens <hca@linux.ibm.com>