Rebased on top of Linux 5.18-rc1
This is the mm part of the series that converts powerpc to default
topdown mmap layout, for merge into v5.18
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.
The actual convertion of powerpc to default topdown mmap layout will
then be resent in a follow-up series for application on v5.19
First patch modifies the core mm to allow powerpc to still provide its
own arch_randomize_brk()
Second patch modifies core mm to give len and flags to
arch_get_mmap_end() as powerpc needs it.
Third patch modifies 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
done at runtime.
Fourth patch is a complement/fix of f6795053dac8 ("mm: mmap: Allow for
"high" userspace addresses") for hugetlb. It adds support for "high"
userspace addresses that are optionally supported on the system and
have to be requested via a hint mechanism ("high" addr parameter to mmap).
Previous version of the series is available at
https://patchwork.ozlabs.org/project/linuxppc-dev/list/?state=*&series=289718
Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Changes in v9:
- Sending mm patches and powerpc patches separately with the objective
of mm patches going into kernel v5.18 and powerpc patches folling up
into kernel v5.19
Changes in v8:
- Moved patch "sizes.h: Add SZ_1T macro" up from which is already in linux-next but not in Linus tree yet.
- Rebased on today's powerpc/next
Changes in v7:
- Taken into account comments from Catalin (patches 3 and 4)
Changes in v6:
- New patch (patch 4) to take arch_get_mmap_base() and arch_get_mmap_end() into account in generic hugetlb_get_unmapped_area()
- Get back arch_randomize_brk() simplification as it relies on default topdown mmap layout.
- Fixed precedence between || and && in powerpc's arch_get_mmap_end() (patch 9)
Changes in v5:
- Added patch 3
- Added arch_get_mmap_base() and arch_get_mmap_end() to patch 7 to better match original powerpc behaviour
- Switched patched 10 and 11 and performed full randomisation in patch 10 just before switching to default implementation, as suggested by Nic.
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 (4):
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
mm: Add len and flags parameters to arch_get_mmap_end()
mm, hugetlbfs: Allow for "high" userspace addresses
arch/arm64/include/asm/processor.h | 4 +--
fs/hugetlbfs/inode.c | 26 ++++++++++++------
include/linux/hugetlb.h | 5 ++++
include/linux/sched/mm.h | 17 ++++++++++++
mm/mmap.c | 43 ++++++++++++++++++------------
mm/util.c | 2 +-
6 files changed, 69 insertions(+), 28 deletions(-)
--
2.35.1
