KVM: s390: get rid of register asm usage
stable inclusion from stable-5.10.50 commit b58b54ef4978959b79b454d88a034eb833324444 bugzilla: 174522 https://gitee.com/openeuler/kernel/issues/I4DNFY Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=b58b54ef4978959b79b454d88a034eb833324444 -------------------------------- [ Upstream commit 4fa3b91b ] Using register asm statements has been proven to be very error prone, especially when using code instrumentation where gcc may add function calls, which clobbers register contents in an unexpected way. Therefore get rid of register asm statements in kvm code, even though there is currently nothing wrong with them. This way we know for sure that this bug class won't be introduced here. Signed-off-by: NHeiko Carstens <hca@linux.ibm.com> Reviewed-by: NChristian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: NThomas Huth <thuth@redhat.com> Reviewed-by: NCornelia Huck <cohuck@redhat.com> Reviewed-by: NClaudio Imbrenda <imbrenda@linux.ibm.com> Link: https://lore.kernel.org/r/20210621140356.1210771-1-hca@linux.ibm.com [borntraeger@de.ibm.com: checkpatch strict fix] Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NSasha Levin <sashal@kernel.org> Signed-off-by: NChen Jun <chenjun102@huawei.com> Acked-by: NWeilong Chen <chenweilong@huawei.com> Signed-off-by: NChen Jun <chenjun102@huawei.com> Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
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