[PATCH 6/7] lib/group_cpus: allow to group cpus in case of !CONFIG_SMP

Ming Lei
2021-08-14T12:36:41Z

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