RISC-V: paravirt: pvqspinlock: Add kconfig entry
Add kconfig entry for paravirt_spinlock, an unfair qspinlock virtualization-friendly backend, by halting the virtual CPU rather than spinning. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@kernel.org>
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