netdev - [PATCH 3/4] Revert "sched/topology: Introduce sched_numa_hop

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Date: Sun, 24 Sep 2023 19:05:27 -0700
From: Yury Norov <yury.norov@...il.com>
To: linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-rdma@...r.kernel.org
Cc: Yury Norov <yury.norov@...il.com>,
	Tariq Toukan <ttoukan.linux@...il.com>,
	Valentin Schneider <vschneid@...hat.com>,
	Maher Sanalla <msanalla@...dia.com>,
	Ingo Molnar <mingo@...nel.org>,
	Mel Gorman <mgorman@...e.de>,
	Saeed Mahameed <saeedm@...dia.com>,
	Leon Romanovsky <leon@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>,
	Daniel Bristot de Oliveira <bristot@...hat.com>,
	Pawel Chmielewski <pawel.chmielewski@...el.com>,
	Jacob Keller <jacob.e.keller@...el.com>,
	Yury Norov <ynorov@...dia.com>
Subject: [PATCH 3/4] Revert "sched/topology: Introduce sched_numa_hop_mask()"

This reverts commit 9feae65845f7b16376716fe70b7d4b9bf8721848.

Now that for_each_numa_hop_mask() is reverted, revert underlying
machinery.

Signed-off-by: Yury Norov <yury.norov@...il.com>
Signed-off-by: Yury Norov <ynorov@...dia.com>
---
 include/linux/topology.h |  7 -------
 kernel/sched/topology.c  | 33 ---------------------------------
 2 files changed, 40 deletions(-)

diff --git a/include/linux/topology.h b/include/linux/topology.h
index 344c2362755a..72f264575698 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -247,18 +247,11 @@ static inline const struct cpumask *cpu_cpu_mask(int cpu)
 
 #ifdef CONFIG_NUMA
 int sched_numa_find_nth_cpu(const struct cpumask *cpus, int cpu, int node);
-extern const struct cpumask *sched_numa_hop_mask(unsigned int node, unsigned int hops);
 #else
 static __always_inline int sched_numa_find_nth_cpu(const struct cpumask *cpus, int cpu, int node)
 {
 	return cpumask_nth(cpu, cpus);
 }
-
-static inline const struct cpumask *
-sched_numa_hop_mask(unsigned int node, unsigned int hops)
-{
-	return ERR_PTR(-EOPNOTSUPP);
-}
 #endif	/* CONFIG_NUMA */
 
 #endif /* _LINUX_TOPOLOGY_H */
diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 05a5bc678c08..3f1c09a9ef6d 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -2143,39 +2143,6 @@ int sched_numa_find_nth_cpu(const struct cpumask *cpus, int cpu, int node)
 	return ret;
 }
 EXPORT_SYMBOL_GPL(sched_numa_find_nth_cpu);
-
-/**
- * sched_numa_hop_mask() - Get the cpumask of CPUs at most @hops hops away from
- *                         @node
- * @node: The node to count hops from.
- * @hops: Include CPUs up to that many hops away. 0 means local node.
- *
- * Return: On success, a pointer to a cpumask of CPUs at most @hops away from
- * @node, an error value otherwise.
- *
- * Requires rcu_lock to be held. Returned cpumask is only valid within that
- * read-side section, copy it if required beyond that.
- *
- * Note that not all hops are equal in distance; see sched_init_numa() for how
- * distances and masks are handled.
- * Also note that this is a reflection of sched_domains_numa_masks, which may change
- * during the lifetime of the system (offline nodes are taken out of the masks).
- */
-const struct cpumask *sched_numa_hop_mask(unsigned int node, unsigned int hops)
-{
-	struct cpumask ***masks;
-
-	if (node >= nr_node_ids || hops >= sched_domains_numa_levels)
-		return ERR_PTR(-EINVAL);
-
-	masks = rcu_dereference(sched_domains_numa_masks);
-	if (!masks)
-		return ERR_PTR(-EBUSY);
-
-	return masks[hops][node];
-}
-EXPORT_SYMBOL_GPL(sched_numa_hop_mask);
-
 #endif /* CONFIG_NUMA */
 
 static int __sdt_alloc(const struct cpumask *cpu_map)
-- 
2.39.2