redhat/configs: Add SMC_LO config option on s390

Mete Durlurequested to merge
mdurlu/kernel-ark:rh-73484 into os-build

Related Centos-9 MR:6875

Upstream Status: RHEL only

Commit message

This introduces a kind of Emulated-ISM device named loopback-ism for
SMCv2.1. The loopback-ism device is currently exclusive for SMC usage,
and aims to provide an SMC shortcut for sockets within the same kernel,
leading to improved intra-OS traffic performance. Configuration of this
feature is managed through the config SMC_LO.

Signed-off-by: Mete Durlu mdurlu@redhat.com

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