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

[Paul Jackson <pj@sgi.com>]

Other than the detail of allowing a newline from doing:

	echo > cpus

to work, I'm ok with this patch.  It passes my cpuset_test,
and seems to allow unpopulating cpusets, as advertised.

Aha - as I was writing this, I noticed that the command:

  echo -n '' > cpus

does -not- work!  The echo command recognizes that as a write
of zero non-null bytes, and skips the write altogether.

We have to add the code to handle an input line consisting of
just a bare newline, to mean an empty mask.  Well, we don't
-have- to.  But writing a single nul byte in shell script will
challenge most shell script hackers.

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@sgi.com> 1.925.600.0401