linux-kernel - [PATCH 01/10] cpumask: Introduce cpumask_any_online

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Message-Id: <1435100183-21720-2-git-send-email-vikas.shivappa@linux.intel.com>
Date:	Tue, 23 Jun 2015 15:56:14 -0700
From:	Vikas Shivappa <vikas.shivappa@...ux.intel.com>
To:	linux-kernel@...r.kernel.org
Cc:	x86@...nel.org, hpa@...or.com, tglx@...utronix.de,
	mingo@...nel.org, tj@...nel.org, peterz@...radead.org,
	matt.fleming@...el.com, will.auld@...el.com,
	glenn.p.williamson@...el.com, kanaka.d.juvva@...el.com,
	priya.v.autee@...el.com, vikas.shivappa@...ux.intel.com
Subject: [PATCH 01/10] cpumask: Introduce cpumask_any_online_but

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@...ux.intel.com>
---
 include/linux/cpumask.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index 27e285b..ea63b65 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)
+{
+	static 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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