linux-kernel - [PATCH v2 rebased 0/9] Convert powerpc to default topdown mmap layout

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Message-Id: <cover.1637862579.git.christophe.leroy@csgroup.eu>
Date:   Thu, 25 Nov 2021 18:52:49 +0100
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, alex@...ti.fr
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-mm@...ck.org
Subject: [PATCH v2 rebased 0/9] Convert powerpc to default topdown mmap layout

Same as v2 but rebased on top of Nic's v4 series "powerpc: Make hash MMU code build configurable"

This series converts powerpc to default topdown mmap layout.

powerpc provides its own arch_get_unmapped_area() only when
slices are needed, which is only for book3s/64. First part of
the series moves slices into book3s/64 specific directories
and cleans up other subarchitectures.

Then a small modification is done to core mm to allow
powerpc to still provide its own arch_randomize_brk()

Last part converts to default topdown mmap layout.

Changes in v2:
- Moved patch 4 before patch 2
- Make generic arch_randomize_brk() __weak
- Added patch 9

Christophe Leroy (9):
  powerpc/mm: Make slice specific to book3s/64
  powerpc/mm: Move vma_mmu_pagesize() and hugetlb_get_unmapped_area() to
    slice.c
  powerpc/mm: Remove CONFIG_PPC_MM_SLICES
  powerpc/mm: Remove asm/slice.h
  powerpc/mm: Call radix__arch_get_unmapped_area() from
    arch_get_unmapped_area()
  mm: Allow arch specific arch_randomize_brk() with
    CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
  powerpc/mm: Convert to default topdown mmap layout
  powerpc/mm: Properly randomise mmap with slices
  powerpc: Simplify and move arch_randomize_brk()

 arch/powerpc/Kconfig                          |   2 +-
 arch/powerpc/include/asm/book3s/64/hash.h     |   7 +-
 arch/powerpc/include/asm/book3s/64/hugetlb.h  |   4 -
 arch/powerpc/include/asm/book3s/64/mmu-hash.h |   1 +
 arch/powerpc/include/asm/book3s/64/slice.h    |  18 ++
 arch/powerpc/include/asm/hugetlb.h            |   2 +-
 arch/powerpc/include/asm/paca.h               |   7 -
 arch/powerpc/include/asm/page.h               |   1 -
 arch/powerpc/include/asm/processor.h          |   2 -
 arch/powerpc/include/asm/slice.h              |  46 ----
 arch/powerpc/kernel/paca.c                    |   5 -
 arch/powerpc/kernel/process.c                 |  41 ----
 arch/powerpc/mm/Makefile                      |   3 +-
 arch/powerpc/mm/book3s64/Makefile             |   2 +-
 arch/powerpc/mm/book3s64/hash_utils.c         |  33 +--
 arch/powerpc/mm/book3s64/radix_hugetlbpage.c  |  55 -----
 arch/powerpc/mm/{ => book3s64}/slice.c        | 200 ++++++++++++++-
 arch/powerpc/mm/hugetlbpage.c                 |  28 ---
 arch/powerpc/mm/mmap.c                        | 228 ------------------
 arch/powerpc/mm/nohash/mmu_context.c          |   9 -
 arch/powerpc/mm/nohash/tlb.c                  |   4 -
 arch/powerpc/platforms/Kconfig.cputype        |   4 -
 include/linux/sizes.h                         |   2 +
 mm/util.c                                     |   2 +-
 24 files changed, 237 insertions(+), 469 deletions(-)
 delete mode 100644 arch/powerpc/include/asm/slice.h
 rename arch/powerpc/mm/{ => book3s64}/slice.c (80%)
 delete mode 100644 arch/powerpc/mm/mmap.c

-- 
2.33.1