tree 86dcdacdd7fbaf671f2487b7a05352aa672fecc1
parent 5db0e1e9e0f30f160b832a0b5cd1131954bf4f6e
author Rusty Russell <rusty@rustcorp.com.au> 1230766950 +1030
committer Rusty Russell <rusty@rustcorp.com.au> 1230766950 +1030

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>