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author | Tejun Heo <tj@kernel.org> | 2013-03-12 11:30:04 -0700 |
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committer | Tejun Heo <tj@kernel.org> | 2013-03-12 11:30:04 -0700 |
commit | ba630e4940924ad1962883c207a62890778ced63 (patch) | |
tree | 5542e7ac7cec8c6d20851374c140805db387f10c /include/linux/cpumask.h | |
parent | 8719dceae2f98a578507c0f6b49c93f320bd729c (diff) | |
download | linux-stable-ba630e4940924ad1962883c207a62890778ced63.tar.gz linux-stable-ba630e4940924ad1962883c207a62890778ced63.tar.bz2 linux-stable-ba630e4940924ad1962883c207a62890778ced63.zip |
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>
Diffstat (limited to 'include/linux/cpumask.h')
-rw-r--r-- | include/linux/cpumask.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h index 032560295fcb..d08e4d2a9b92 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. |