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From:   Ming Lei <ming.lei@redhat.com>
To:     Thomas Gleixner <tglx@linutronix.de>, Jens Axboe <axboe@kernel.dk>
Cc:     linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
        Christoph Hellwig <hch@lst.de>, Ming Lei <ming.lei@redhat.com>
Subject: [PATCH 6/7] lib/group_cpus: allow to group cpus in case of !CONFIG_SMP
Date:   Sat, 14 Aug 2021 20:35:31 +0800
Message-Id: <20210814123532.229494-7-ming.lei@redhat.com>
In-Reply-To: <20210814123532.229494-1-ming.lei@redhat.com>
References: <20210814123532.229494-1-ming.lei@redhat.com>
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Allows group_cpus_evenly() to be called in case of !CONFIG_SMP by simply
assigning all CPUs into the 1st group.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
 include/linux/group_cpus.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/include/linux/group_cpus.h b/include/linux/group_cpus.h
index e42807ec61f6..79e5cc15bd96 100644
--- a/include/linux/group_cpus.h
+++ b/include/linux/group_cpus.h
@@ -9,6 +9,20 @@
 #include <linux/kernel.h>
 #include <linux/cpu.h>
 
+#ifdef CONFIG_SMP
 struct cpumask *group_cpus_evenly(unsigned int numgrps);
+#else
+static inline struct cpumask *group_cpus_evenly(unsigned int numgrps)
+{
+	struct cpumask *masks = kcalloc(numgrps, sizeof(*masks), GFP_KERNEL);
+
+	if (!masks)
+		return NULL;
+
+	/* assign all CPUs(cpu 0) to the 1st group only */
+	cpumask_copy(&masks[0], cpu_possible_mask);
+	return masks;
+}
+#endif
 
 #endif
-- 
2.31.1