Re: [patch] cpusets: allow empty {cpus,mems}_allowed to be set for unpopulated cpuset

[Paul Jackson <pj@sgi.com>]

David wrote:
> You currently cannot remove all cpus or mems from cpus_allowed or
> mems_allowed of a cpuset.  We now allow both if there are no attached
> tasks.

Why do you need this?  It adds a little more code, and changes
semantics a little bit, so I'd think it should have at least a
little bit of justfication.


+	if (!*buf) {
+		cpus_clear(trialcs.cpus_allowed);

Won't the above code fail if someone does:

	echo > /dev/cpuset/foobar/mems

Just guessing, but I'd expect buf[] to contain a newline char,
not just a zero length string, at this point.

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                  Paul Jackson <pj@sgi.com> 1.925.600.0401