From: Rusty Russell <rusty@rustcorp.com.au>
Date: Wed, 31 Dec 2008 23:42:30 +0000 (+1030)
Subject: cpumask: zero extra bits in alloc_cpumask_var_node
X-Git-Tag: v2.6.29-rc1~521^2~11^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2a53008033189ed09bfe241c6b33811ba4ce980d;p=pandora-kernel.git

cpumask: zero extra bits in alloc_cpumask_var_node

Impact: extra safety checks during transition

When CONFIG_CPUMASKS_OFFSTACK is set, the new cpumask_ operators only
use bits up to nr_cpu_ids, not NR_CPUS.  Using the old cpus_ operators
on these masks can mean accessing undefined bits.

After some discussion, Mike and I decided to err on the side of caution;
we zero the "undefined" bits in alloc_cpumask_var_node() until all the
old cpumask functions are removed.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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