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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	[thread overview]
Message-ID: <20210814123532.229494-7-ming.lei@redhat.com> (raw)
In-Reply-To: <20210814123532.229494-1-ming.lei@redhat.com>

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


  parent reply	other threads:[~2021-08-14 12:36 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-14 12:35 [PATCH 0/7] genirq/affinity: abstract new API from managed irq affinity spread Ming Lei
2021-08-14 12:35 ` [PATCH 1/7] genirq/affinity: remove the 'firstvec' parameter from irq_build_affinity_masks Ming Lei
2021-08-17  4:45   ` Christoph Hellwig
2021-08-14 12:35 ` [PATCH 2/7] genirq/affinity: pass affinity managed mask array to irq_build_affinity_masks Ming Lei
2021-08-17  4:46   ` Christoph Hellwig
2021-08-14 12:35 ` [PATCH 3/7] genirq/affinity: don't pass irq_affinity_desc " Ming Lei
2021-08-17  4:49   ` Christoph Hellwig
2021-08-14 12:35 ` [PATCH 4/7] genirq/affinity: rename irq_build_affinity_masks as group_cpus_evenly Ming Lei
2021-08-17  4:50   ` Christoph Hellwig
2021-08-18  8:38     ` Ming Lei
2021-08-14 12:35 ` [PATCH 5/7] genirq/affinity: move group_cpus_evenly() into lib/ Ming Lei
2021-08-14 17:01   ` kernel test robot
2021-08-16  1:04     ` Ming Lei
2021-08-17  4:52       ` Christoph Hellwig
2021-08-14 17:15   ` kernel test robot
2021-08-14 12:35 ` Ming Lei [this message]
2021-08-17  4:52   ` [PATCH 6/7] lib/group_cpus: allow to group cpus in case of !CONFIG_SMP Christoph Hellwig
2021-08-14 12:35 ` [PATCH 7/7] blk-mq: build default queue map via group_cpus_evenly() Ming Lei
2021-08-14 16:31   ` kernel test robot
2021-08-14 20:49   ` kernel test robot
2021-08-16  7:23     ` Ming Lei

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