__fix_to_virt
#define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT))
#define TRAMP_VALIAS (__fix_to_virt(FIX_ENTRY_TRAMP_TEXT1))
#define __fix_to_virt(_x) (FIXMAP_START + ((_x) << PAGE_SHIFT))
#define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT))
#define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT))