[PATCH 01/10] cpumask: Introduce cpumask_any_online_but

[Vikas Shivappa]

There is currently no cpumask helper function to pick a "random" cpu
from a mask which is also online.

cpumask_any_online_but() does that which is similar to cpumask_any_but()
but also returns a cpu that is online.

Signed-off-by: Vikas Shivappa <vikas.shivappa@xxxxxxxxxxxxxxx>
---
 include/linux/cpumask.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index 27e285b..f2d7e8a 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -548,6 +548,24 @@ static inline void cpumask_copy(struct cpumask *dstp,
 #define cpumask_of(cpu) (get_cpu_mask(cpu))
 
 /**
+ * cpumask_any_online_but - return a "random"  and online cpu in a cpumask,
+ * but not this one
+ * @mask: the input mask to search
+ * @cpu: the cpu to ignore
+ *
+ * Returns >= nr_cpu_ids if no cpus set.
+*/
+static inline unsigned int cpumask_any_online_but(const struct cpumask *mask,
+					   unsigned int cpu)
+{
+	cpumask_t tmp;
+
+	cpumask_and(&tmp, cpu_online_mask, mask);
+	cpumask_clear_cpu(cpu, &tmp);
+	return cpumask_any(&tmp);
+}
+
+/**
  * cpumask_parse_user - extract a cpumask from a user string
  * @buf: the buffer to extract from
  * @len: the length of the buffer
-- 
1.9.1

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