s390: avoid using global register for currentstackpointer
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v6.0.10 by commit a478952a8ac44e32316dc046a063a7dc34825aa6, it was introduced in version v5.18 by commit 30de14b1884ba609fc1acfba5b40309e3a6ccefe. For more details please see the references link.