linux-kernel - [PATCH 1/2] sched/topology: introduce node_has

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Message-Id: <20230222025029.453834-1-yury.norov@gmail.com>
Date:   Tue, 21 Feb 2023 18:50:28 -0800
From:   Yury Norov <yury.norov@...il.com>
To:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Cc:     Yury Norov <yury.norov@...il.com>, Arnd Bergmann <arnd@...db.de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Jeremy Kerr <jk@...abs.org>, Jakub Kicinski <kuba@...nel.org>,
        Valentin Schneider <vschneid@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Barry Song <baohua@...nel.org>
Subject: [PATCH 1/2] sched/topology: introduce node_has_cpus() macro

Currently, to check if NUMA node has CPUs, one has to use the
nr_cpus_node() macro, which ends up with cpumask_weight. We can do it
better with cpumask_empty(), because the latter can potentially return
earlier - as soon as 1st set bit found.

This patch adds a node_has_cpus() macro to implement that.

Signed-off-by: Yury Norov <yury.norov@...il.com>
---
 include/linux/topology.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/linux/topology.h b/include/linux/topology.h
index fea32377f7c7..7e0d8f8f5a39 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -39,9 +39,11 @@
 #define nr_cpus_node(node) cpumask_weight(cpumask_of_node(node))
 #endif
 
+#define node_has_cpus(node) (!cpumask_empty(cpumask_of_node(node)))
+
 #define for_each_node_with_cpus(node)			\
 	for_each_online_node(node)			\
-		if (nr_cpus_node(node))
+		if (node_has_cpus(node))
 
 int arch_update_cpu_topology(void);
 
-- 
2.34.1