From: Lai Jiangshan <laijs@cn.fujitsu.com>
Date: Fri, 6 Jun 2008 05:46:32 +0000 (-0700)
Subject: cpusets: fix bug when adding nonexistent cpu or mem
X-Git-Tag: v2.6.26-rc6~60
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=37340746a66e5e7feed5945f28cb75d90a8fd9f6;p=pandora-kernel.git

cpusets: fix bug when adding nonexistent cpu or mem

Adding a nonexistent cpu to a cpuset will be omitted quietly.  It should
return -EINVAL.

Example: (real_nr_cpus <= 4 < NR_CPUS or cpu#4 was just offline)

# cat cpus
0-1
# /bin/echo 4 > cpus
# /bin/echo $?
0
# cat cpus

#

The same occurs when add a nonexistent mem.
This patch will fix this bug.
And when *buf == "", the check is unneeded.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Acked-by: Paul Jackson <pj@sgi.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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