cpumask: implement cpumask_parse() (ba630e49) · Commits · 戴 / test

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>

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

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