Messages in this thread Patch in this message | | | From | Tejun Heo <> | Subject | [PATCH 29/31] cpumask: implement cpumask_parse() | Date | Fri, 1 Mar 2013 19:24:20 -0800 |
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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> --- 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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