[PATCH v4 00/10] Convert powerpc to default topdown mmap layout

Christophe Leroy
2021-12-08T17:19:27Z

Rebased on top of Nic's series "powerpc: Make hash MMU code build configurable" in today's powerpc/merge-test on github

This series converts powerpc to default topdown mmap layout.

powerpc requires 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.

Last part converts to default topdown mmap layout.

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

Another modification is done to core mm to allow powerpc
to use generic versions of get_unmapped_area functions for Radix
while still providing its own implementation for Hash, the
selection between Radix and Hash being doing at runtime.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>

Changes in v4:
- Move arch_randomize_brk() simplification out of this series
- Add a change to core mm to enable using generic implementation
while providing arch specific one at the same time.
- Reworked radix get_unmapped_area to use generic implementation
- Rebase on top of Nic's series v6

Changes in v3:
- Fixed missing <linux/elf-randomize.h> in last patch
- Added a patch to move SZ_1T out of drivers/pci/controller/pci-xgene.c

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

Christophe Leroy (10):
mm: Allow arch specific arch_randomize_brk() with
CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
mm, hugetlbfs: Allow an arch to always use generic versions of
get_unmapped_area functions
powerpc/mm: Move vma_mmu_pagesize()
powerpc/mm: Make slice specific to book3s/64
powerpc/mm: Remove CONFIG_PPC_MM_SLICES
powerpc/mm: Use generic_get_unmapped_area() and call it from
arch_get_unmapped_area()
powerpc/mm: Use generic_hugetlb_get_unmapped_area()
powerpc/mm: Move get_unmapped_area functions to slice.c
powerpc/mm: Convert to default topdown mmap layout
powerpc/mm: Properly randomise mmap with slices

arch/powerpc/Kconfig | 2 +-
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/mmu.h | 6 -
arch/powerpc/include/asm/book3s/64/slice.h | 24 ++
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/mm/Makefile | 3 +-
arch/powerpc/mm/book3s64/Makefile | 2 +-
arch/powerpc/mm/book3s64/hash_utils.c | 14 -
arch/powerpc/mm/book3s64/radix_hugetlbpage.c | 55 ----
arch/powerpc/mm/{ => book3s64}/slice.c | 71 ++++-
arch/powerpc/mm/hugetlbpage.c | 34 ---
arch/powerpc/mm/mmap.c | 256 ------------------
arch/powerpc/mm/nohash/mmu_context.c | 9 -
arch/powerpc/mm/nohash/tlb.c | 4 -
arch/powerpc/platforms/Kconfig.cputype | 4 -
fs/hugetlbfs/inode.c | 17 +-
include/linux/hugetlb.h | 5 +
include/linux/sched/mm.h | 9 +
mm/mmap.c | 31 ++-
mm/util.c | 2 +-
26 files changed, 139 insertions(+), 477 deletions(-)
delete mode 100644 arch/powerpc/include/asm/slice.h
rename arch/powerpc/mm/{ => book3s64}/slice.c (91%)
delete mode 100644 arch/powerpc/mm/mmap.c

--
2.33.1