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Date: Fri, 31 Jul 2020 12:55:00 +0100 From: Valentin Schneider <valentin.schneider@....com> To: linux-kernel@...r.kernel.org Cc: Peter Zijlstra <peterz@...radead.org>, mingo@...nel.org, vincent.guittot@...aro.org, dietmar.eggemann@....com, morten.rasmussen@....com, Quentin Perret <qperret@...gle.com> Subject: [PATCH v4 08/10] 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@...radead.org> Signed-off-by: Valentin Schneider <valentin.schneider@....com> --- kernel/sched/topology.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c index 93a7ff52335b..c6ecc395c76c 100644 --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -204,8 +204,6 @@ sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent) SD_SHARE_PKG_RESOURCES | SD_OVERLAP | SD_PREFER_SIBLING); - if (nr_node_ids == 1) - pflags &= ~SD_SERIALIZE; } if (~cflags & pflags) return 0; -- 2.27.0
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