sched/topology: Remove SD_SERIALIZE degeneration special case
If there is only a single NUMA node in the system, the only NUMA topology level that will be generated will be NODE (identity distance), which doesn't have SD_SERIALIZE. This means we don't need this special case in sd_parent_degenerate(), as having the NODE level "naturally" covers it. Thus, remove it. Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Valentin Schneider <valentin.schneider@arm.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: https://lore.kernel.org/r/20200817113003.20802-10-valentin.schneider@arm.com
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@ -183,11 +183,9 @@ sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent)
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return 0;
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/* Flags needing groups don't count if only 1 group in parent */
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if (parent->groups == parent->groups->next) {
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if (parent->groups == parent->groups->next)
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pflags &= ~(SD_DEGENERATE_GROUPS_MASK | SD_PREFER_SIBLING);
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if (nr_node_ids == 1)
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pflags &= ~SD_SERIALIZE;
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}
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if (~cflags & pflags)
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return 0;
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