Here's relatively low-risk part of 5-level paging patchset. Merging it now would make x86 5-level paging enabling in v4.12 easier. Linus, please consider applying. The first patch is actually x86-specific: detect 5-level paging support. It boils down to single define. The rest of patchset converts Linux MMU abstraction from 4- to 5-level paging. Enabling of new abstraction in most cases requires adding single line of code in arch-specific code. The rest is taken care by asm-generic/. Changes to mm/ code are mostly mechanical: add support for new page table level -- p4d_t -- where we deal with pud_t now. v2: - fix build on microblaze (Michal); - comment for __ARCH_HAS_5LEVEL_HACK in kasan_populate_zero_shadow(); - acks from Michal; Kirill A. Shutemov (7): x86/cpufeature: Add 5-level paging detection asm-generic: introduce 5level-fixup.h asm-generic: introduce __ARCH_USE_5LEVEL_HACK arch, mm: convert all architectures to use 5level-fixup.h asm-generic: introduce <asm-generic/pgtable-nop4d.h> mm: convert generic code to 5-level paging mm: introduce __p4d_alloc() arch/arc/include/asm/hugepage.h | 1 + arch/arc/include/asm/pgtable.h | 1 + arch/arm/include/asm/pgtable.h | 1 + arch/arm64/include/asm/pgtable-types.h | 4 + arch/avr32/include/asm/pgtable-2level.h | 1 + arch/cris/include/asm/pgtable.h | 1 + arch/frv/include/asm/pgtable.h | 1 + arch/h8300/include/asm/pgtable.h | 1 + arch/hexagon/include/asm/pgtable.h | 1 + arch/ia64/include/asm/pgtable.h | 2 + arch/metag/include/asm/pgtable.h | 1 + arch/microblaze/include/asm/page.h | 3 +- arch/mips/include/asm/pgtable-32.h | 1 + arch/mips/include/asm/pgtable-64.h | 1 + arch/mn10300/include/asm/page.h | 1 + arch/nios2/include/asm/pgtable.h | 1 + arch/openrisc/include/asm/pgtable.h | 1 + arch/powerpc/include/asm/book3s/32/pgtable.h | 1 + arch/powerpc/include/asm/book3s/64/pgtable.h | 3 + arch/powerpc/include/asm/nohash/32/pgtable.h | 1 + arch/powerpc/include/asm/nohash/64/pgtable-4k.h | 3 + arch/powerpc/include/asm/nohash/64/pgtable-64k.h | 1 + arch/s390/include/asm/pgtable.h | 1 + arch/score/include/asm/pgtable.h | 1 + arch/sh/include/asm/pgtable-2level.h | 1 + arch/sh/include/asm/pgtable-3level.h | 1 + arch/sparc/include/asm/pgtable_64.h | 1 + arch/tile/include/asm/pgtable_32.h | 1 + arch/tile/include/asm/pgtable_64.h | 1 + arch/um/include/asm/pgtable-2level.h | 1 + arch/um/include/asm/pgtable-3level.h | 1 + arch/unicore32/include/asm/pgtable.h | 1 + arch/x86/include/asm/cpufeatures.h | 3 +- arch/x86/include/asm/pgtable_types.h | 4 + arch/xtensa/include/asm/pgtable.h | 1 + drivers/misc/sgi-gru/grufault.c | 9 +- fs/userfaultfd.c | 6 +- include/asm-generic/4level-fixup.h | 3 +- include/asm-generic/5level-fixup.h | 41 ++++ include/asm-generic/pgtable-nop4d-hack.h | 62 ++++++ include/asm-generic/pgtable-nop4d.h | 56 ++++++ include/asm-generic/pgtable-nopud.h | 48 ++--- include/asm-generic/pgtable.h | 48 ++++- include/asm-generic/tlb.h | 14 +- include/linux/hugetlb.h | 5 +- include/linux/kasan.h | 1 + include/linux/mm.h | 34 +++- lib/ioremap.c | 39 +++- mm/gup.c | 46 ++++- mm/huge_memory.c | 7 +- mm/hugetlb.c | 29 +-- mm/kasan/kasan_init.c | 44 ++++- mm/memory.c | 230 +++++++++++++++++++---- mm/mlock.c | 1 + mm/mprotect.c | 26 ++- mm/mremap.c | 13 +- mm/page_vma_mapped.c | 6 +- mm/pagewalk.c | 32 +++- mm/pgtable-generic.c | 6 + mm/rmap.c | 7 +- mm/sparse-vmemmap.c | 22 ++- mm/swapfile.c | 26 ++- mm/userfaultfd.c | 23 ++- mm/vmalloc.c | 81 +++++--- 64 files changed, 868 insertions(+), 147 deletions(-) create mode 100644 include/asm-generic/5level-fixup.h create mode 100644 include/asm-generic/pgtable-nop4d-hack.h create mode 100644 include/asm-generic/pgtable-nop4d.h -- 2.11.0
