linux-kernel - [PATCH 29/31] cpumask: implement cpumask

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Date:	Fri,  1 Mar 2013 19:24:20 -0800
From:	Tejun Heo <tj@...nel.org>
To:	linux-kernel@...r.kernel.org, laijs@...fujitsu.com
Cc:	axboe@...nel.dk, jmoyer@...hat.com, zab@...hat.com,
	Tejun Heo <tj@...nel.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: [PATCH 29/31] cpumask: implement cpumask_parse()

We have cpulist_parse() but not cpumask_parse().  Implement it using
bitmap_parse().

bitmap_parse() is weird in that it takes @len for a string in
kernel-memory which also is inconsistent with bitmap_parselist().
Make cpumask_parse() calculate the length and don't expose the
inconsistency to cpumask users.  Maybe we can fix up bitmap_parse()
later.

This will be used to expose workqueue cpumask knobs to userland via
sysfs.

Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Rusty Russell <rusty@...tcorp.com.au>
---
Rusty, if this looks okay to you, would it be okay for me to route it
together with the rest of workqueue changes?

Thanks.

 include/linux/cpumask.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index 0325602..d08e4d2 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -591,6 +591,21 @@ static inline int cpulist_scnprintf(char *buf, int len,
 }
 
 /**
+ * cpumask_parse - extract a cpumask from from a string
+ * @buf: the buffer to extract from
+ * @dstp: the cpumask to set.
+ *
+ * Returns -errno, or 0 for success.
+ */
+static inline int cpumask_parse(const char *buf, struct cpumask *dstp)
+{
+	char *nl = strchr(buf, '\n');
+	int len = nl ? nl - buf : strlen(buf);
+
+	return bitmap_parse(buf, len, cpumask_bits(dstp), nr_cpumask_bits);
+}
+
+/**
  * cpulist_parse - extract a cpumask from a user string of ranges
  * @buf: the buffer to extract from
  * @dstp: the cpumask to set.
-- 
1.8.1.2

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