@@ -272,8 +272,30 @@ unsigned int cpumask_next_wrap(int n, const struct cpumask *mask, int start, boo
return cpumask_first(mask);
}
+static inline unsigned int cpumask_next_and_wrap(int n,
+ const struct cpumask *mask1,
+ const struct cpumask *mask2,
+ int start, bool wrap)
+{
+ cpumask_check(start);
+ /* n is a prior cpu */
+ cpumask_check(n + 1);
+
+ /*
+ * Return the first available CPU when wrapping, or when starting before cpu0,
+ * since there is only one valid option.
+ */
+ if (wrap && n >= 0)
+ return nr_cpumask_bits;
+
+ return cpumask_first_and(mask1, mask2);
+}
#else
unsigned int __pure cpumask_next_wrap(int n, const struct cpumask *mask, int start, bool wrap);
+unsigned int __pure cpumask_next_and_wrap(int n,
+ const struct cpumask *mask1,
+ const struct cpumask *mask2,
+ int start, bool wrap);
#endif
/**
@@ -44,6 +44,29 @@ unsigned int cpumask_next_wrap(int n, const struct cpumask *mask, int start, boo
}
EXPORT_SYMBOL(cpumask_next_wrap);
+/**
+ * cpumask_next_and_wrap - Get the next CPU in a mask, starting from a given
+ * position and wrapping around to visit all CPUs.
+ * @n: the cpu prior to the place to search
+ * @mask1: the first cpumask pointer
+ * @mask2: the second cpumask pointer
+ * @start: the start point of the iteration
+ * @wrap: assume @n crossing @start terminates the iteration
+ *
+ * Returns >= nr_cpu_ids on completion
+ *
+ * Note: the @wrap argument is required for the start condition when
+ * we cannot assume @start is set in @mask.
+ */
+unsigned int cpumask_next_and_wrap(int n,
+ const struct cpumask *mask1,
+ const struct cpumask *mask2,
+ int start, bool wrap)
+{
+ return CPUMASK_NEXT_WRAP(cpumask_next_and(n, mask1, mask2), n, start, wrap);
+}
+EXPORT_SYMBOL(cpumask_next_and_wrap);
+
/* These are not inline because of header tangles. */
#ifdef CONFIG_CPUMASK_OFFSTACK
/**
This leverages the newly-introduced CPUMASK_NEXT_WRAP() macro. Signed-off-by: Valentin Schneider <vschneid@redhat.com> --- include/linux/cpumask.h | 22 ++++++++++++++++++++++ lib/cpumask.c | 23 +++++++++++++++++++++++ 2 files changed, 45 insertions(+)