REG_MASK
#define REG_MASK \
#define REG_MASK(n) ((BIT(n)) - 1)
#define REG_MASK(b) (BIT(b + 1) - 1)
#define REG_MASK 0xffffffff
#define REG_MASK GENMASK(TARGET_OFFSET - 1, 0)
#define REG_MASK(r) (REG_MASK0(r) << REG_SHIFT(r))
#define REG_MASK (KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_COPROC_MASK)
#define REG_MASK (KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK)