vdso_total_pages
extern unsigned int vdso_total_pages;
npages += vdso_total_pages;
vdso_total_pages = VDSO_NR_PAGES; /* for the data/vvar pages */
vdso_total_pages += text_pages;
len = (vdso_total_pages - VDSO_NR_PAGES) << PAGE_SHIFT;
unsigned int vdso_total_pages __ro_after_init;