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Message-Id: <20230819141239.287290-5-yury.norov@gmail.com>
Date: Sat, 19 Aug 2023 07:12:36 -0700
From: Yury Norov <yury.norov@...il.com>
To: linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc: Yury Norov <yury.norov@...il.com>, Ingo Molnar <mingo@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Ben Segall <bsegall@...gle.com>,
Daniel Bristot de Oliveira <bristot@...hat.com>,
Dietmar Eggemann <dietmar.eggemann@....com>,
Jacob Keller <jacob.e.keller@...el.com>,
Jakub Kicinski <kuba@...nel.org>,
Juri Lelli <juri.lelli@...hat.com>,
Mel Gorman <mgorman@...e.de>,
Steven Rostedt <rostedt@...dmis.org>,
Tariq Toukan <tariqt@...dia.com>,
Valentin Schneider <vschneid@...hat.com>,
Vincent Guittot <vincent.guittot@...aro.org>,
shiju.jose@...wei.com, jonathan.cameron@...wei.com,
prime.zeng@...wei.com, linuxarm@...wei.com,
yangyicong@...ilicon.com,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: [PATCH v2 4/6] sched: fix sched_numa_find_nth_cpu() in non-NUMA case
When CONFIG_NUMA is enabled, sched_numa_find_nth_cpu() searches for a
CPU in sched_domains_numa_masks. The masks includes only online CPUs,
so effectively offline CPUs are skipped.
When CONFIG_NUMA is disabled, the fallback function should be consistent.
Fixes: cd7f55359c90 ("sched: add sched_numa_find_nth_cpu()")
Signed-off-by: Yury Norov <yury.norov@...il.com>
---
include/linux/topology.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/topology.h b/include/linux/topology.h
index fea32377f7c7..52f5850730b3 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -251,7 +251,7 @@ extern const struct cpumask *sched_numa_hop_mask(unsigned int node, unsigned int
#else
static __always_inline int sched_numa_find_nth_cpu(const struct cpumask *cpus, int cpu, int node)
{
- return cpumask_nth(cpu, cpus);
+ return cpumask_nth_and(cpu, cpus, cpu_online_mask);
}
static inline const struct cpumask *
--
2.39.2
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