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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@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
wifi-calibration
Tejun Heo 2013-03-12 11:30:04 -07:00
parent 8719dceae2
commit ba630e4940
1 changed files with 15 additions and 0 deletions
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15
include/linux/cpumask.h
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@ -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