hwt_backend_enable
.hwt_backend_enable = pt_backend_enable,
.hwt_backend_enable = spe_backend_enable,
ctx->hwt_backend->ops->hwt_backend_enable(ctx, cpu_id);
void (*hwt_backend_enable)(struct hwt_context *, int cpu_id);
void hwt_backend_enable(struct hwt_context *ctx, int cpu_id);
hwt_backend_enable(ctx, cpu_id);
hwt_backend_enable(ctx, cpu_id);