FIXMAP_SIZE
#define FIXMAP_BASE (PAGE_OFFSET - FIXMAP_SIZE - PKMAP_SIZE)
#define PKMAP_BASE (FIXMAP_BASE + FIXMAP_SIZE)
BUILD_BUG_ON(PAGE_OFFSET < (VMALLOC_END + FIXMAP_SIZE + PKMAP_SIZE));
#define FIXMAP_START (TMPALIAS_MAP_START - FIXMAP_SIZE)
(void *)FIXMAP_START, (void *)(FIXMAP_START + FIXMAP_SIZE),
(unsigned long)(FIXMAP_SIZE / 1024),
unsigned long end = FIXMAP_START + FIXMAP_SIZE;
BUILD_BUG_ON(FIXMAP_SIZE > PMD_SIZE);
FIXMAP_SIZE + MODULES_LEN + KASLR_LEN;
vsize = (VMALLOC_END - FIXMAP_SIZE) / 2;