KVM: s390: interrupt: use READ_ONCE() before cmpxchg()
Use READ_ONCE() before cmpxchg() to prevent that the compiler generates code that fetches the to be compared old value several times from memory. Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com> Acked-by: Christian Borntraeger <borntraeger@linux.ibm.com> Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Link: https://lore.kernel.org/r/20230109145456.2895385-1-hca@linux.ibm.comSigned-off-by: Heiko Carstens <hca@linux.ibm.com>
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