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: [RFC PATCH 6/7] lib/group_cpus: allow to group cpus in case of !CONFIG_SMP
Date: Mon, 19 Jul 2021 17:57:28 +0800 [thread overview]
Message-ID: <20210719095729.834332-7-ming.lei@redhat.com> (raw)
In-Reply-To: <20210719095729.834332-1-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
next prev parent reply other threads:[~2021-07-19 9:58 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-19 9:57 [RFC PATCH 0/7] genirq/affinity: abstract new API from managed irq affinity spread Ming Lei
2021-07-19 9:57 ` [RFC PATCH 1/7] genirq/affinity: remove the 'firstvec' parameter from irq_build_affinity_masks Ming Lei
2021-07-19 9:57 ` [RFC PATCH 2/7] genirq/affinity: pass affinity managed mask array to irq_build_affinity_masks Ming Lei
2021-07-19 9:57 ` [RFC PATCH 3/7] genirq/affinity: don't pass irq_affinity_desc " Ming Lei
2021-07-19 9:57 ` [RFC PATCH 4/7] genirq/affinity: rename irq_build_affinity_masks as group_cpus_evenly Ming Lei
2021-07-19 9:57 ` [RFC PATCH 5/7] genirq/affinity: move group_cpus_evenly() into lib/ Ming Lei
2021-07-19 9:57 ` Ming Lei [this message]
2021-07-19 9:57 ` [RFC PATCH 7/7] blk-mq: build default queue map via group_cpus_evenly() Ming Lei
2021-07-26 10:37 ` [RFC PATCH 0/7] genirq/affinity: abstract new API from managed irq affinity spread Ming Lei
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