1 files changed, 45 insertions, 0 deletions

diff --git a/lib/cpumask.c b/lib/cpumask.c
new file mode 100644
index 000000000000..3a67dc5ada7d
--- /dev/null
+++ b/lib/cpumask.c
@@ -0,0 +1,45 @@
+#include <linux/kernel.h>
+#include <linux/bitops.h>
+#include <linux/cpumask.h>
+#include <linux/module.h>
+
+int __first_cpu(const cpumask_t *srcp)
+{
+        return min_t(int, NR_CPUS, find_first_bit(srcp->bits, NR_CPUS));
+}
+EXPORT_SYMBOL(__first_cpu);
+
+int __next_cpu(int n, const cpumask_t *srcp)
+{
+        return min_t(int, NR_CPUS, find_next_bit(srcp->bits, NR_CPUS, n+1));
+}
+EXPORT_SYMBOL(__next_cpu);
+
+/*
+ * Find the highest possible smp_processor_id()
+ *
+ * Note: if we're prepared to assume that cpu_possible_map never changes
+ * (reasonable) then this function should cache its return value.
+ */
+int highest_possible_processor_id(void)
+{
+        unsigned int cpu;
+        unsigned highest = 0;
+
+        for_each_cpu_mask(cpu, cpu_possible_map)
+                highest = cpu;
+        return highest;
+}
+EXPORT_SYMBOL(highest_possible_processor_id);
+
+int __any_online_cpu(const cpumask_t *mask)
+{
+        int cpu;
+
+        for_each_cpu_mask(cpu, *mask) {
+                if (cpu_online(cpu))
+                        break;
+        }
+        return cpu;
+}
+EXPORT_SYMBOL(__any_online_cpu);