[PATCH 0/3] Add a unified parameter "nopvspin"

[Zhenzhong Duan]

There are cases folks want to disable spinlock optimization for
debug/test purpose. Xen and hyperv already have parameters "xen_nopvspin"
and "hv_nopvspin" to support that, but kvm doesn't.

The first patch adds that feature to KVM guest with "nopvspin".
I also changed print code in first patch, I'm not sure if I should
pick that part into a separate patch, just let me know if it's
preferred.

For compatibility reason original parameters "xen_nopvspin" and
"hv_nopvspin" are retained and marked obsolete.


Thanks
Zhenzhong