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diff --git a/sys/compat/linuxkpi/common/include/linux/cpu.h b/sys/compat/linuxkpi/common/include/linux/cpu.h
--- a/sys/compat/linuxkpi/common/include/linux/cpu.h
+++ b/sys/compat/linuxkpi/common/include/linux/cpu.h
@@ -44,6 +44,8 @@
extern cpumask_t cpu_online_mask;
+cpumask_t *lkpi_get_static_single_cpu_mask(int);
+
static __inline int
cpumask_next(int cpuid, cpumask_t mask)
{
@@ -73,4 +75,6 @@
CPU_SET(cpu, mask);
}
+#define cpumask_of(_cpu) (lkpi_get_static_single_cpu_mask(_cpu))
+
#endif /* _LINUXKPI_LINUX_CPU_H */
diff --git a/sys/compat/linuxkpi/common/src/linux_compat.c b/sys/compat/linuxkpi/common/src/linux_compat.c
--- a/sys/compat/linuxkpi/common/src/linux_compat.c
+++ b/sys/compat/linuxkpi/common/src/linux_compat.c
@@ -132,6 +132,7 @@
static struct vm_area_struct *linux_cdev_handle_find(void *handle);
cpumask_t cpu_online_mask;
+static cpumask_t static_single_cpu_mask[MAXCPU];
struct kobject linux_class_root;
struct device linux_root_device;
struct class linux_class_misc;
@@ -2734,6 +2735,16 @@
struct cpuinfo_x86 boot_cpu_data;
#endif
+cpumask_t *
+lkpi_get_static_single_cpu_mask(int cpuid)
+{
+
+ KASSERT((cpuid >= 0 && cpuid < MAXCPU), ("%s: invalid cpuid %d\n",
+ __func__, cpuid));
+
+ return (&static_single_cpu_mask[cpuid]);
+}
+
static void
linux_compat_init(void *arg)
{
@@ -2771,6 +2782,15 @@
init_waitqueue_head(&linux_var_waitq);
CPU_COPY(&all_cpus, &cpu_online_mask);
+ /*
+ * Generate a single-CPU cpumask_t for each CPU (possibly) in the system.
+ * CPUs are indexed from 0..(MAXCPU-1). The entry for cpuid 0 will only
+ * have itself in the cpumask, cupid 1 only itself on entry 1, and so on.
+ * This is used by cpumask_of() (and possibly others in the future) for,
+ * e.g., drivers to pass hints to irq_set_affinity_hint().
+ */
+ for (i = 0; i < MAXCPU; i++)
+ CPU_SET(i, &static_single_cpu_mask[i]);
}
SYSINIT(linux_compat, SI_SUB_DRIVERS, SI_ORDER_SECOND, linux_compat_init, NULL);

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