FIXMAP_PAGE_RO 50 include/asm-generic/fixmap.h #if !defined(FIXMAP_PAGE_RO) && defined(PAGE_KERNEL_RO) FIXMAP_PAGE_RO 231 mm/early_ioremap.c #ifdef FIXMAP_PAGE_RO FIXMAP_PAGE_RO 236 mm/early_ioremap.c FIXMAP_PAGE_RO);