netdev - [PATCH 7/9] sched/topology: Introduce for_each_numa_hop

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Message-Id: <20230121042436.2661843-8-yury.norov@gmail.com>
Date:   Fri, 20 Jan 2023 20:24:34 -0800
From:   Yury Norov <yury.norov@...il.com>
To:     linux-kernel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Barry Song <baohua@...nel.org>,
        Ben Segall <bsegall@...gle.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Gal Pressman <gal@...dia.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Haniel Bristot de Oliveira <bristot@...hat.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Ingo Molnar <mingo@...hat.com>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Jason Gunthorpe <jgg@...dia.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Leon Romanovsky <leonro@...dia.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Mel Gorman <mgorman@...e.de>,
        Peter Lafreniere <peter@...jl.ca>,
        Peter Zijlstra <peterz@...radead.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Saeed Mahameed <saeedm@...dia.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Tariq Toukan <tariqt@...dia.com>,
        Tariq Toukan <ttoukan.linux@...il.com>,
        Tony Luck <tony.luck@...el.com>,
        Valentin Schneider <vschneid@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>
Cc:     Yury Norov <yury.norov@...il.com>, linux-crypto@...r.kernel.org,
        netdev@...r.kernel.org, linux-rdma@...r.kernel.org
Subject: [PATCH 7/9] sched/topology: Introduce for_each_numa_hop_mask()

From: Valentin Schneider <vschneid@...hat.com>

The recently introduced sched_numa_hop_mask() exposes cpumasks of CPUs
reachable within a given distance budget, wrap the logic for iterating over
all (distance, mask) values inside an iterator macro.

Signed-off-by: Valentin Schneider <vschneid@...hat.com>
Reviewed-by: Yury Norov <yury.norov@...il.com>
Signed-off-by: Yury Norov <yury.norov@...il.com>
---
 include/linux/topology.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/include/linux/topology.h b/include/linux/topology.h
index 344c2362755a..fea32377f7c7 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -261,4 +261,22 @@ sched_numa_hop_mask(unsigned int node, unsigned int hops)
 }
 #endif	/* CONFIG_NUMA */
 
+/**
+ * for_each_numa_hop_mask - iterate over cpumasks of increasing NUMA distance
+ *                          from a given node.
+ * @mask: the iteration variable.
+ * @node: the NUMA node to start the search from.
+ *
+ * Requires rcu_lock to be held.
+ *
+ * Yields cpu_online_mask for @node == NUMA_NO_NODE.
+ */
+#define for_each_numa_hop_mask(mask, node)				       \
+	for (unsigned int __hops = 0;					       \
+	     mask = (node != NUMA_NO_NODE || __hops) ?			       \
+		     sched_numa_hop_mask(node, __hops) :		       \
+		     cpu_online_mask,					       \
+	     !IS_ERR_OR_NULL(mask);					       \
+	     __hops++)
+
 #endif /* _LINUX_TOPOLOGY_H */
-- 
2.34.1