[S390] Protect against sigaltstack wraparound.
This is just a port of 83bd0102 "x86: protect against sigaltstack wraparound". Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
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