Force CPU masks off stack

configname: CONFIG_CPUMASK_OFFSTACK

Linux Kernel Configuration
└─>Library routines
└─>Force CPU masks off stack
In linux kernel since version 2.6.29 (release Date: 2009-03-23)  
Use dynamic allocation for cpumask_var_t, instead of putting
them on the stack. This is a bit more expensive, but avoids
stack overflow.