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Commit ba630e49 authored by Tejun Heo's avatar Tejun Heo
Browse files

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: default avatarTejun Heo <tj@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
parent 8719dcea

include/linux/cpumask.h

+15 −0
Original line number Diff line number Diff line
@@ -590,6 +590,21 @@ static inline int cpulist_scnprintf(char *buf, int len, 
				    nr_cpumask_bits);

}



/**

 * 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