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genirq/affinity: Only build SMP-only helper functions on SMP kernels

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commit 188a569658584e93930ab60334c5a1079c0330d8 upstream.

allnoconfig grew these new build warnings in lib/group_cpus.c:

  lib/group_cpus.c:247:12: warning: ‘__group_cpus_evenly’ defined but not used [-Wunused-function]
  lib/group_cpus.c:75:13: warning: ‘build_node_to_cpumask’ defined but not used [-Wunused-function]
  lib/group_cpus.c:66:13: warning: ‘free_node_to_cpumask’ defined but not used [-Wunused-function]
  lib/group_cpus.c:43:23: warning: ‘alloc_node_to_cpumask’ defined but not used [-Wunused-function]

Widen the #ifdef CONFIG_SMP block to not expose unused helpers on
non-SMP builds.

Also annotate the preprocessor branches for better readability.

Fixes: f7b3ea8cf72f ("genirq/affinity: Move group_cpus_evenly() into lib/")
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20221227022905.352674-6-ming.lei@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ingo Molnar 2023-01-18 12:14:01 +01:00 • committed by Greg Kroah-Hartman
parent 28c9222e29
commit 397f719037
1 changed files with 4 additions and 3 deletions
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7
lib/group_cpus.c
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@ -9,6 +9,8 @@
#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)
{
@ -327,7 +329,6 @@ static int __group_cpus_evenly(unsigned int startgrp, unsigned int numgrps,
return done;
}
#ifdef CONFIG_SMP
/**
* group_cpus_evenly - Group all CPUs evenly per NUMA/CPU locality
* @numgrps: number of groups
@ -422,7 +423,7 @@ struct cpumask *group_cpus_evenly(unsigned int numgrps)
}
return masks;
}
#else
#else /* CONFIG_SMP */
struct cpumask *group_cpus_evenly(unsigned int numgrps)
{
struct cpumask *masks = kcalloc(numgrps, sizeof(*masks), GFP_KERNEL);
@ -434,4 +435,4 @@ struct cpumask *group_cpus_evenly(unsigned int numgrps)
cpumask_copy(&masks[0], cpu_possible_mask);
return masks;
}
#endif
#endif /* CONFIG_SMP */