参照元†
$ grep -r HAVE_ARCH_UNMAPPED_AREA *
arch/alpha/include/asm/pgtable.h:#define HAVE_ARCH_UNMAPPED_AREA
arch/arm/include/asm/pgtable.h:#define HAVE_ARCH_UNMAPPED_AREA
arch/frv/include/asm/uaccess.h:#define HAVE_ARCH_UNMAPPED_AREA /* we decide where to put mmaps */
arch/ia64/include/asm/pgtable.h:#define HAVE_ARCH_UNMAPPED_AREA
arch/mips/include/asm/pgtable.h:#define HAVE_ARCH_UNMAPPED_AREA
arch/parisc/include/asm/pgtable.h:#define HAVE_ARCH_UNMAPPED_AREA
arch/powerpc/include/asm/pgtable-ppc64.h:#define HAVE_ARCH_UNMAPPED_AREA
arch/powerpc/include/asm/pgtable-ppc64.h:#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
arch/sh/include/asm/pgtable.h:#define HAVE_ARCH_UNMAPPED_AREA
arch/sh/include/asm/pgtable.h:#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
arch/sparc/include/asm/pgtable_32.h:#define HAVE_ARCH_UNMAPPED_AREA
arch/sparc/include/asm/pgtable_64.h:#define HAVE_ARCH_UNMAPPED_AREA
arch/sparc/include/asm/pgtable_64.h:#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
arch/x86/include/asm/pgtable_64.h:#define HAVE_ARCH_UNMAPPED_AREA
arch/x86/include/asm/pgtable_64.h:#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
mm/mmap.c:#ifndef HAVE_ARCH_UNMAPPED_AREA
mm/mmap.c:#ifndef HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
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