cpumask: introduce cpumask_nth_and_andnot

[linux-2.6-microblaze.git] / include / linux / cpumask.h

diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index c2aa0aa..7b16aed 100644 (file)
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -391,6 +391,26 @@ unsigned int cpumask_nth_andnot(unsigned int cpu, const struct cpumask *srcp1,
                                nr_cpumask_bits, cpumask_check(cpu));
 }
 
+/**
+ * cpumask_nth_and_andnot - get the Nth cpu set in 1st and 2nd cpumask, and clear in 3rd.
+ * @srcp1: the cpumask pointer
+ * @srcp2: the cpumask pointer
+ * @srcp3: the cpumask pointer
+ * @cpu: the N'th cpu to find, starting from 0
+ *
+ * Returns >= nr_cpu_ids if such cpu doesn't exist.
+ */
+static __always_inline
+unsigned int cpumask_nth_and_andnot(unsigned int cpu, const struct cpumask *srcp1,
+                                                       const struct cpumask *srcp2,
+                                                       const struct cpumask *srcp3)
+{
+       return find_nth_and_andnot_bit(cpumask_bits(srcp1),
+                                       cpumask_bits(srcp2),
+                                       cpumask_bits(srcp3),
+                                       nr_cpumask_bits, cpumask_check(cpu));
+}
+
 #define CPU_BITS_NONE                                          \
 {                                                              \
        [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL                  \