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0d5751b4b6
Fixes a regression introduced in80917a1054: "scylla_prepare: stop generating 'mode' value in perftune.yaml" When cpuset.conf contains a "full" CPU set the negation of it from the "full" CPU set is going to generate a zero mask as a irq_cpu_mask. This is an illegal value that will eventually end up in the generated perftune.yaml, which in line will make the scylla service fail to start until the issue is resolved. In such a case a irq_cpu_mask must represent a "full" CPU set mimicking a former 'MQ' mode. \Fixes scylladb/scylladb#11701 Tested: - Manually on a 2 vCPU VM in an 'auto-selection' mode. - Manually on a large VM (48 vCPUs) with an 'MQ' manually enforced. Message-Id: <20221004004237.2961246-1-vladz@scylladb.com> (cherry picked from commit8195dab92a)