linux-kernel - [tip: sched/core] sched/topology: Remove unused numa_distance in cpu_attach

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Date:   Thu, 14 Oct 2021 11:16:18 -0000
From:   "tip-bot2 for Yicong Yang" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Yicong Yang <yangyicong@...ilicon.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Barry Song <baohua@...nel.org>,
        Valentin Schneider <valentin.schneider@....com>,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: sched/core] sched/topology: Remove unused numa_distance in
 cpu_attach_domain()

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     f9ec6fea201429b5a3f76319e943989f1a1e25ef
Gitweb:        https://git.kernel.org/tip/f9ec6fea201429b5a3f76319e943989f1a1e25ef
Author:        Yicong Yang <yangyicong@...ilicon.com>
AuthorDate:    Wed, 15 Sep 2021 14:31:58 +08:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Thu, 14 Oct 2021 13:09:58 +02:00

sched/topology: Remove unused numa_distance in cpu_attach_domain()

numa_distance in cpu_attach_domain() is introduced in
commit b5b217346de8 ("sched/topology: Warn when NUMA diameter > 2")
to warn user when NUMA diameter > 2 as we'll misrepresent
the scheduler topology structures at that time. This is
fixed by Barry in commit 585b6d2723dc ("sched/topology: fix the issue
groups don't span domain->span for NUMA diameter > 2") and
numa_distance is unused now. So remove it.

Signed-off-by: Yicong Yang <yangyicong@...ilicon.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Barry Song <baohua@...nel.org>
Reviewed-by: Valentin Schneider <valentin.schneider@....com>
Link: https://lore.kernel.org/r/20210915063158.80639-1-yangyicong@hisilicon.com
---
 kernel/sched/topology.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index c56faae..5af3edd 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -688,7 +688,6 @@ cpu_attach_domain(struct sched_domain *sd, struct root_domain *rd, int cpu)
 {
 	struct rq *rq = cpu_rq(cpu);
 	struct sched_domain *tmp;
-	int numa_distance = 0;
 
 	/* Remove the sched domains which do not contribute to scheduling. */
 	for (tmp = sd; tmp; ) {
@@ -732,9 +731,6 @@ cpu_attach_domain(struct sched_domain *sd, struct root_domain *rd, int cpu)
 		}
 	}
 
-	for (tmp = sd; tmp; tmp = tmp->parent)
-		numa_distance += !!(tmp->flags & SD_NUMA);
-
 	sched_domain_debug(sd, cpu);
 
 	rq_attach_root(rq, rd);