linux-kernel - [PATCH v8 02/12] lib/group_cpus: remove dead !SMP code

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Message-Id: <20250905-isolcpus-io-queues-v8-2-885984c5daca@kernel.org>
Date: Fri, 05 Sep 2025 16:59:48 +0200
From: Daniel Wagner <wagi@...nel.org>
To: Jens Axboe <axboe@...nel.dk>, Keith Busch <kbusch@...nel.org>, 
 Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>, 
 "Michael S. Tsirkin" <mst@...hat.com>
Cc: Aaron Tomlin <atomlin@...mlin.com>, 
 "Martin K. Petersen" <martin.petersen@...cle.com>, 
 Thomas Gleixner <tglx@...utronix.de>, 
 Costa Shulyupin <costa.shul@...hat.com>, Juri Lelli <juri.lelli@...hat.com>, 
 Valentin Schneider <vschneid@...hat.com>, Waiman Long <llong@...hat.com>, 
 Ming Lei <ming.lei@...hat.com>, Frederic Weisbecker <frederic@...nel.org>, 
 Mel Gorman <mgorman@...e.de>, Hannes Reinecke <hare@...e.de>, 
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, 
 Aaron Tomlin <atomlin@...mlin.com>, linux-kernel@...r.kernel.org, 
 linux-block@...r.kernel.org, linux-nvme@...ts.infradead.org, 
 megaraidlinux.pdl@...adcom.com, linux-scsi@...r.kernel.org, 
 storagedev@...rochip.com, virtualization@...ts.linux.dev, 
 GR-QLogic-Storage-Upstream@...vell.com, Daniel Wagner <wagi@...nel.org>
Subject: [PATCH v8 02/12] lib/group_cpus: remove dead !SMP code

The support for the !SMP configuration has been removed from the core by
commit cac5cefbade9 ("sched/smp: Make SMP unconditional").

Signed-off-by: Daniel Wagner <wagi@...nel.org>
---
 lib/group_cpus.c | 20 --------------------
 1 file changed, 20 deletions(-)

diff --git a/lib/group_cpus.c b/lib/group_cpus.c
index 6d08ac05f371bf880571507d935d9eb501616a84..f254b232522d44c141cdc4e44e2c99a4148c08d6 100644
--- a/lib/group_cpus.c
+++ b/lib/group_cpus.c
@@ -9,8 +9,6 @@
 #include <linux/sort.h>
 #include <linux/group_cpus.h>

-#ifdef CONFIG_SMP
-
 static void grp_spread_init_one(struct cpumask *irqmsk, struct cpumask *nmsk,
 				unsigned int cpus_per_grp)
 {
@@ -425,22 +423,4 @@ struct cpumask *group_cpus_evenly(unsigned int numgrps, unsigned int *nummasks)
 	*nummasks = min(nr_present + nr_others, numgrps);
 	return masks;
 }
-#else /* CONFIG_SMP */
-struct cpumask *group_cpus_evenly(unsigned int numgrps, unsigned int *nummasks)
-{
-	struct cpumask *masks;
-
-	if (numgrps == 0)
-		return NULL;
-
-	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);
-	*nummasks = 1;
-	return masks;
-}
-#endif /* CONFIG_SMP */
 EXPORT_SYMBOL_GPL(group_cpus_evenly);

-- 
2.51.0